Replace mapbox variant with std::variant.

Telegram/SourceFiles/apiwrap.cpp

@@ -2684,14 +2684,14 @@ void ApiWrap::requestFileReference(
 			// See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87122
 			const auto &origin = p.first;
 			const auto &reference = p.second;
-			const auto documentId = base::get_if<DocumentFileLocationId>(
+			const auto documentId = std::get_if<DocumentFileLocationId>(
 				&origin);
 			if (documentId) {
 				_session->data().document(
 					documentId->id
 				)->refreshFileReference(reference);
 			}
-			const auto photoId = base::get_if<PhotoFileLocationId>(&origin);
+			const auto photoId = std::get_if<PhotoFileLocationId>(&origin);
 			if (photoId) {
 				_session->data().photo(
 					photoId->id
@@ -2826,7 +2826,7 @@ void ApiWrap::refreshFileReference(
 				MTP_long(data.themeId),
 				MTP_long(data.accessHash)),
 			MTP_long(0)));
-	}, [&](std::nullopt_t) {
+	}, [&](v::null_t) {
 		fail();
 	});
 }

Telegram/SourceFiles/boxes/background_box.cpp

@@ -446,7 +446,7 @@ int BackgroundBox::Inner::getSelectionIndex(
 		return data.index;
 	}, [](const DeleteSelected &data) {
 		return data.index;
-	}, [](std::nullopt_t) {
+	}, [](v::null_t) {
 		return -1;
 	});
 }

Telegram/SourceFiles/boxes/dictionaries_manager.cpp

@@ -225,7 +225,7 @@ auto AddButtonWithLoader(
 
 	buttonState->value(
 	) | rpl::start_with_next([=](const DictState &state) {
-		const auto isToggledSet = state.is<Active>();
+		const auto isToggledSet = v::is<Active>(state);
 		const auto toggled = isToggledSet ? 1. : 0.;
 		const auto over = !button->isDisabled()
 			&& (button->isDown() || button->isOver());
@@ -252,7 +252,7 @@ auto AddButtonWithLoader(
 					dictionaryRemoved->events(),
 					buttonState->value(
 					) | rpl::filter([](const DictState &state) {
-						return state.is<Failed>();
+						return v::is<Failed>(state);
 					}) | rpl::to_empty
 				) | rpl::map_to(false)
 			)
@@ -276,13 +276,14 @@ auto AddButtonWithLoader(
 			});
 	}) | rpl::flatten_latest(
 	) | rpl::filter([=](const DictState &state) {
-		return !buttonState->current().is<Failed>() || !state.is<Available>();
+		return !v::is<Failed>(buttonState->current())
+			|| !v::is<Available>(state);
 	});
 
 	button->toggledValue(
 	) | rpl::start_with_next([=](bool toggled) {
 		const auto &state = buttonState->current();
-		if (toggled && (state.is<Available>() || state.is<Failed>())) {
+		if (toggled && (v::is<Available>(state) || v::is<Failed>(state))) {
 			const auto weak = Ui::MakeWeak(button);
 			setLocalLoader(base::make_unique_q<Loader>(
 				QCoreApplication::instance(),
@@ -292,7 +293,7 @@ auto AddButtonWithLoader(
 				Spellchecker::DictPathByLangId(id),
 				Spellchecker::GetDownloadSize(id),
 				crl::guard(weak, destroyLocalLoader)));
-		} else if (!toggled && state.is<Loading>()) {
+		} else if (!toggled && v::is<Loading>(state)) {
 			if (const auto g = rawGlobalLoaderPtr()) {
 				g->destroy();
 				return;

Telegram/SourceFiles/boxes/edit_caption_box.cpp

@@ -431,7 +431,7 @@ void EditCaptionBox::setupStreamedPreview(std::shared_ptr<Document> shared) {
 }
 
 void EditCaptionBox::handleStreamingUpdate(Update &&update) {
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		streamingReady(std::move(update));
 	}, [&](const PreloadedVideo &update) {
 	}, [&](const UpdateVideo &update) {

Telegram/SourceFiles/boxes/language_box.cpp

@@ -395,7 +395,7 @@ void Rows::mouseReleaseEvent(QMouseEvent *e) {
 			activateByIndex(data.index);
 		}, [&](MenuSelection data) {
 			showMenu(data.index);
-		}, [](std::nullopt_t) {});
+		}, [](v::null_t) {});
 	}
 }
 
@@ -601,7 +601,7 @@ int Rows::indexFromSelection(Selection selected) const {
 		return data.index;
 	}, [&](MenuSelection data) {
 		return data.index;
-	}, [](std::nullopt_t) {
+	}, [](v::null_t) {
 		return -1;
 	});
 }
@@ -648,7 +648,7 @@ rpl::producer<bool> Rows::isEmpty() const {
 }
 
 void Rows::repaint(Selection selected) {
-	selected.match([](std::nullopt_t) {
+	selected.match([](v::null_t) {
 	}, [&](const auto &data) {
 		repaint(data.index);
 	});

Telegram/SourceFiles/chat_helpers/emoji_sets_manager.cpp

@@ -263,8 +263,8 @@ void Row::paintRadio(Painter &p) {
 	const auto loading = _loading
 		? _loading->computeState()
 		: Ui::RadialState{ 0., 0, FullArcLength };
-	const auto isToggledSet = _state.current().is<Active>();
+	const auto isToggledSet = v::is<Active>(_state.current());
-	const auto isActiveSet = isToggledSet || _state.current().is<Loading>();
+	const auto isActiveSet = isToggledSet || v::is<Loading>(_state.current());
 	const auto toggled = _toggled.value(isToggledSet ? 1. : 0.);
 	const auto active = _active.value(isActiveSet ? 1. : 0.);
 	const auto _st = &st::defaultRadio;
@@ -345,7 +345,7 @@ void Row::onStateChanged(State was, StateChangeSource source) {
 }
 
 void Row::updateStatusColorOverride() {
-	const auto isToggledSet = _state.current().is<Active>();
+	const auto isToggledSet = v::is<Active>(_state.current());
 	const auto toggled = _toggled.value(isToggledSet ? 1. : 0.);
 	const auto over = showOver();
 	if (toggled == 0. && !over) {
@@ -373,7 +373,8 @@ void Row::setupContent(const Set &set) {
 			});
 	}) | rpl::flatten_latest(
 	) | rpl::filter([=](const SetState &state) {
-		return !_state.current().is<Failed>() || !state.is<Available>();
+		return !v::is<Failed>(_state.current())
+			|| !v::is<Available>(state);
 	});
 
 	setupLabels(set);
@@ -390,9 +391,10 @@ void Row::setupHandler() {
 	clicks(
 	) | rpl::filter([=] {
 		const auto &state = _state.current();
-		return !_switching && (state.is<Ready>() || state.is<Available>());
+		return !_switching && (v::is<Ready>(state)
+			|| v::is<Available>(state));
 	}) | rpl::start_with_next([=] {
-		if (_state.current().is<Available>()) {
+		if (v::is<Available>(_state.current())) {
 			load();
 			return;
 		}
@@ -409,7 +411,7 @@ void Row::setupHandler() {
 
 	_state.value(
 	) | rpl::map([=](const SetState &state) {
-		return state.is<Ready>() || state.is<Available>();
+		return v::is<Ready>(state) || v::is<Available>(state);
 	}) | rpl::start_with_next([=](bool active) {
 		setDisabled(!active);
 		setPointerCursor(active);
@@ -463,7 +465,7 @@ void Row::setupPreview(const Set &set) {
 
 void Row::updateLoadingToFinished() {
 	_loading->update(
-		_state.current().is<Failed>() ? 0. : 1.,
+		v::is<Failed>(_state.current()) ? 0. : 1.,
 		true,
 		crl::now());
 }
@@ -471,7 +473,7 @@ void Row::updateLoadingToFinished() {
 void Row::radialAnimationCallback(crl::time now) {
 	const auto updated = [&] {
 		const auto state = _state.current();
-		if (const auto loading = base::get_if<Loading>(&state)) {
+		if (const auto loading = std::get_if<Loading>(&state)) {
 			return _loading->update(CountProgress(loading), false, now);
 		} else {
 			updateLoadingToFinished();
@@ -493,7 +495,7 @@ void Row::setupAnimation() {
 
 	_state.value(
 	) | rpl::map(
-		_1 == Active()
+		_1 == SetState{ Active() }
 	) | rpl::distinct_until_changed(
 	) | rpl::start_with_next([=](bool toggled) {
 		_toggled.start(
@@ -505,7 +507,7 @@ void Row::setupAnimation() {
 
 	_state.value(
 	) | rpl::map([](const SetState &state) {
-		return state.is<Loading>() || state.is<Active>();
+		return v::is<Loading>(state) || v::is<Active>(state);
 	}) | rpl::distinct_until_changed(
 	) | rpl::start_with_next([=](bool active) {
 		_active.start(
@@ -517,7 +519,7 @@ void Row::setupAnimation() {
 
 	_state.value(
 	) | rpl::map([](const SetState &state) {
-		return base::get_if<Loading>(&state);
+		return std::get_if<Loading>(&state);
 	}) | rpl::distinct_until_changed(
 	) | rpl::start_with_next([=](const Loading *loading) {
 		if (loading && !_loading) {

Telegram/SourceFiles/chat_helpers/stickers_list_widget.cpp

@@ -143,7 +143,7 @@ private:
 		Search,
 		Settings,
 	};
-	using OverState = base::variant<SpecialOver, int>;
+	using OverState = std::variant<SpecialOver, int>;
 
 	template <typename Callback>
 	void enumerateVisibleIcons(Callback callback);
@@ -548,7 +548,7 @@ void StickersListWidget::Footer::mouseMoveEvent(QMouseEvent *e) {
 
 	if (!_iconsDragging
 		&& !_icons.empty()
-		&& base::get_if<int>(&_iconDown) != nullptr) {
+		&& v::is<int>(_iconDown)) {
 		if ((_iconsMousePos - _iconsMouseDown).manhattanLength() >= QApplication::startDragDistance()) {
 			_iconsDragging = true;
 		}
@@ -579,7 +579,7 @@ void StickersListWidget::Footer::mouseReleaseEvent(QMouseEvent *e) {
 
 	updateSelected();
 	if (wasDown == _iconOver) {
-		if (const auto index = base::get_if<int>(&_iconOver)) {
+		if (const auto index = std::get_if<int>(&_iconOver)) {
 			_iconSelX = anim::value(
 				*index * st::stickerIconWidth,
 				*index * st::stickerIconWidth);
@@ -604,7 +604,7 @@ bool StickersListWidget::Footer::eventHook(QEvent *e) {
 	if (e->type() == QEvent::TouchBegin) {
 	} else if (e->type() == QEvent::Wheel) {
 		if (!_icons.empty()
-			&& (base::get_if<int>(&_iconOver) != nullptr)
+			&& v::is<int>(_iconOver)
 			&& (_iconDown == SpecialOver::None)) {
 			scrollByWheelEvent(static_cast<QWheelEvent*>(e));
 		}
@@ -635,7 +635,7 @@ void StickersListWidget::Footer::scrollByWheelEvent(
 }
 
 void StickersListWidget::Footer::updateSelected() {
-	if (_iconDown >= 0) {
+	if (_iconDown != SpecialOver::None) {
 		return;
 	}
 
@@ -2109,7 +2109,7 @@ void StickersListWidget::mouseReleaseEvent(QMouseEvent *e) {
 	_previewTimer.cancel();
 
 	auto pressed = _pressed;
-	setPressed(std::nullopt);
+	setPressed(v::null);
 	if (pressed != _selected) {
 		update();
 	}
@@ -2271,8 +2271,8 @@ void StickersListWidget::enterFromChildEvent(QEvent *e, QWidget *child) {
 }
 
 void StickersListWidget::clearSelection() {
-	setPressed(std::nullopt);
+	setPressed(v::null);
-	setSelected(std::nullopt);
+	setSelected(v::null);
 	update();
 }
 
@@ -2754,7 +2754,7 @@ void StickersListWidget::updateSelected() {
 		return;
 	}
 
-	auto newSelected = OverState { std::nullopt };
+	auto newSelected = OverState { v::null };
 	auto p = mapFromGlobal(_lastMousePosition);
 	if (!rect().contains(p)
 		|| p.y() < getVisibleTop() || p.y() >= getVisibleBottom()

Telegram/SourceFiles/core/core_cloud_password.cpp

@@ -157,7 +157,7 @@ CloudPasswordResult ComputeCheck(
 }
 
 bytes::vector ComputeHash(
-		std::nullopt_t,
+		v::null_t,
 		bytes::const_span password) {
 	Unexpected("Bad secure secret algorithm.");
 }
@@ -200,7 +200,7 @@ CloudPasswordCheckRequest ParseCloudPasswordCheckRequest(
 
 CloudPasswordAlgo ValidateNewCloudPasswordAlgo(CloudPasswordAlgo &&parsed) {
 	if (!parsed.is<CloudPasswordAlgoModPow>()) {
-		return std::nullopt;
+		return v::null;
 	}
 	auto &value = parsed.get_unchecked<CloudPasswordAlgoModPow>();
 	const auto already = value.salt1.size();
@@ -216,7 +216,7 @@ MTPPasswordKdfAlgo PrepareCloudPasswordAlgo(const CloudPasswordAlgo &data) {
 			MTP_bytes(data.salt2),
 			MTP_int(data.g),
 			MTP_bytes(data.p));
-	}, [](std::nullopt_t) {
+	}, [](v::null_t) {
 		return MTP_passwordKdfAlgoUnknown();
 	});
 }
@@ -230,7 +230,7 @@ bytes::vector ComputeCloudPasswordHash(
 		bytes::const_span password) {
 	return algo.match([&](const CloudPasswordAlgoModPow &data) {
 		return ComputeHash(data, password);
-	}, [](std::nullopt_t) -> bytes::vector {
+	}, [](v::null_t) -> bytes::vector {
 		Unexpected("Bad cloud password algorithm.");
 	});
 }
@@ -240,7 +240,7 @@ CloudPasswordDigest ComputeCloudPasswordDigest(
 		bytes::const_span password) {
 	return algo.match([&](const CloudPasswordAlgoModPow &data) {
 		return ComputeDigest(data, password);
-	}, [](std::nullopt_t) -> CloudPasswordDigest {
+	}, [](v::null_t) -> CloudPasswordDigest {
 		Unexpected("Bad cloud password algorithm.");
 	});
 }
@@ -250,7 +250,7 @@ CloudPasswordResult ComputeCloudPasswordCheck(
 		bytes::const_span hash) {
 	return request.algo.match([&](const CloudPasswordAlgoModPow &data) {
 		return ComputeCheck(request, data, hash);
-	}, [](std::nullopt_t) -> CloudPasswordResult {
+	}, [](v::null_t) -> CloudPasswordResult {
 		Unexpected("Bad cloud password algorithm.");
 	});
 }
@@ -271,7 +271,7 @@ SecureSecretAlgo ParseSecureSecretAlgo(
 
 SecureSecretAlgo ValidateNewSecureSecretAlgo(SecureSecretAlgo &&parsed) {
 	if (!parsed.is<SecureSecretAlgoPBKDF2>()) {
-		return std::nullopt;
+		return v::null;
 	}
 	auto &value = parsed.get_unchecked<SecureSecretAlgoPBKDF2>();
 	const auto already = value.salt.size();
@@ -287,7 +287,7 @@ MTPSecurePasswordKdfAlgo PrepareSecureSecretAlgo(
 			MTP_bytes(data.salt));
 	}, [](const SecureSecretAlgoSHA512 &data) {
 		return MTP_securePasswordKdfAlgoSHA512(MTP_bytes(data.salt));
-	}, [](std::nullopt_t) {
+	}, [](v::null_t) {
 		return MTP_securePasswordKdfAlgoUnknown();
 	});
 }

Telegram/SourceFiles/core/crash_reports.h

@@ -35,7 +35,7 @@ enum Status {
 	Started
 };
 // Open status or crash report dump.
-using StartResult = base::variant<Status, QByteArray>;
+using StartResult = std::variant<Status, QByteArray>;
 StartResult Start();
 Status Restart(); // can be only CantOpen or Started
 void Finish();

Telegram/SourceFiles/core/sandbox.cpp

@@ -315,7 +315,7 @@ void Sandbox::singleInstanceChecked() {
 		return;
 	}
 	const auto result = CrashReports::Start();
-	result.match([&](CrashReports::Status status) {
+	v::match(result, [&](CrashReports::Status status) {
 		if (status == CrashReports::CantOpen) {
 			new NotStartedWindow();
 		} else {

Telegram/SourceFiles/data/data_cloud_file.cpp

@@ -54,7 +54,7 @@ void CloudImage::set(
 		_file.flags = CloudFile::Flag();
 		_view = std::weak_ptr<CloudImageView>();
 	} else if (was != now
-		&& (!was.is<InMemoryLocation>() || now.is<InMemoryLocation>())) {
+		&& (!v::is<InMemoryLocation>(was) || v::is<InMemoryLocation>(now))) {
 		_file.location = ImageLocation();
 		_view = std::weak_ptr<CloudImageView>();
 	}
@@ -176,8 +176,8 @@ void UpdateCloudFile(
 	}
 	auto cacheBytes = !data.bytes.isEmpty()
 		? data.bytes
-		: file.location.file().data.is<InMemoryLocation>()
+		: v::is<InMemoryLocation>(file.location.file().data)
-		? file.location.file().data.get_unchecked<InMemoryLocation>().bytes
+		? std::get<InMemoryLocation>(file.location.file().data).bytes
 		: QByteArray();
 	if (!cacheBytes.isEmpty()) {
 		if (const auto cacheKey = data.location.file().cacheKey()) {

Telegram/SourceFiles/data/data_file_origin.h

@@ -148,7 +148,7 @@ inline bool operator<(PhotoFileLocationId a, PhotoFileLocationId b) {
 	return a.id < b.id;
 }
 
-using FileLocationId = base::variant<
+using FileLocationId = std::variant<
 	DocumentFileLocationId,
 	PhotoFileLocationId>;
 

Telegram/SourceFiles/data/data_photo.cpp

@@ -445,10 +445,10 @@ auto PhotoData::createStreamingLoader(
 			return Media::Streaming::MakeBytesLoader(media->videoContent());
 		}
 	}
-	return videoLocation().file().data.is<StorageFileLocation>()
+	return v::is<StorageFileLocation>(videoLocation().file().data)
 		? std::make_unique<Media::Streaming::LoaderMtproto>(
 			&session().downloader(),
-			videoLocation().file().data.get_unchecked<StorageFileLocation>(),
+			std::get<StorageFileLocation>(videoLocation().file().data),
 			videoByteSize(),
 			origin)
 		: nullptr;

Telegram/SourceFiles/data/data_shared_media.cpp

@@ -231,11 +231,11 @@ std::optional<int> SharedMediaWithLastSlice::skippedAfter() const {
 }
 
 std::optional<int> SharedMediaWithLastSlice::indexOfImpl(Value value) const {
-	return base::get_if<FullMsgId>(&value)
+	return std::get_if<FullMsgId>(&value)
-		? _slice.indexOf(*base::get_if<FullMsgId>(&value))
+		? _slice.indexOf(*std::get_if<FullMsgId>(&value))
 		: (isolatedInSlice()
 			|| !_lastPhotoId
-			|| (*base::get_if<not_null<PhotoData*>>(&value))->id != *_lastPhotoId)
+			|| (*std::get_if<not_null<PhotoData*>>(&value))->id != *_lastPhotoId)
 			? std::nullopt
 			: Add(_slice.size() - 1, lastPhotoSkip());
 }
@@ -267,14 +267,14 @@ std::optional<int> SharedMediaWithLastSlice::indexOf(Value value) const {
 		info.push_back((_ending && _ending->skippedAfter())
 			? QString::number(*_ending->skippedAfter())
 			: QString("-"));
-		if (const auto msgId = base::get_if<FullMsgId>(&value)) {
+		if (const auto msgId = std::get_if<FullMsgId>(&value)) {
 			info.push_back("value:" + QString::number(msgId->channel));
 			info.push_back(QString::number(msgId->msg));
-			const auto index = _slice.indexOf(*base::get_if<FullMsgId>(&value));
+			const auto index = _slice.indexOf(*std::get_if<FullMsgId>(&value));
 			info.push_back("index:" + (index
 				? QString::number(*index)
 				: QString("-")));
-		} else if (const auto photo = base::get_if<not_null<PhotoData*>>(&value)) {
+		} else if (const auto photo = std::get_if<not_null<PhotoData*>>(&value)) {
 			info.push_back("value:" + QString::number((*photo)->id));
 		} else {
 			info.push_back("value:bad");
@@ -373,7 +373,7 @@ rpl::producer<SharedMediaWithLastSlice> SharedMediaWithLastViewer(
 		int limitBefore,
 		int limitAfter) {
 	return [=](auto consumer) {
-		if (base::get_if<not_null<PhotoData*>>(&key.universalId)) {
+		if (std::get_if<not_null<PhotoData*>>(&key.universalId)) {
 			return SharedMediaMergedViewer(
 				session,
 				SharedMediaMergedKey(

Telegram/SourceFiles/data/data_shared_media.h

@@ -60,9 +60,9 @@ class SharedMediaWithLastSlice {
 public:
 	using Type = Storage::SharedMediaType;
 
-	using Value = base::variant<FullMsgId, not_null<PhotoData*>>;
+	using Value = std::variant<FullMsgId, not_null<PhotoData*>>;
 	using MessageId = SparseIdsMergedSlice::UniversalMsgId;
-	using UniversalMsgId = base::variant<
+	using UniversalMsgId = std::variant<
 		MessageId,
 		not_null<PhotoData*>>;
 
@@ -76,8 +76,7 @@ public:
 		, migratedPeerId(migratedPeerId)
 		, type(type)
 		, universalId(universalId) {
-			Expects(base::get_if<MessageId>(&universalId) != nullptr
+			Expects(v::is<MessageId>(universalId) || type == Type::ChatPhoto);
-				|| type == Type::ChatPhoto);
 		}
 
 		bool operator==(const Key &other) const {
@@ -120,8 +119,8 @@ public:
 		return {
 			key.peerId,
 			key.migratedPeerId,
-			base::get_if<MessageId>(&key.universalId)
+			v::is<MessageId>(key.universalId)
-				? (*base::get_if<MessageId>(&key.universalId))
+				? std::get<MessageId>(key.universalId)
 				: ServerMaxMsgId - 1
 		};
 	}
@@ -135,7 +134,7 @@ public:
 
 private:
 	static std::optional<SparseIdsMergedSlice> EndingSlice(const Key &key) {
-		return base::get_if<MessageId>(&key.universalId)
+		return v::is<MessageId>(key.universalId)
 			? base::make_optional(SparseIdsMergedSlice(EndingKey(key)))
 			: std::nullopt;
 	}
@@ -161,12 +160,12 @@ private:
 			msgId);
 	}
 	static Value ComputeId(const Key &key) {
-		if (auto messageId = base::get_if<MessageId>(&key.universalId)) {
+		if (const auto messageId = std::get_if<MessageId>(&key.universalId)) {
 			return (*messageId >= 0)
 				? ComputeId(key.peerId, *messageId)
 				: ComputeId(key.migratedPeerId, ServerMaxMsgId + *messageId);
 		}
-		return *base::get_if<not_null<PhotoData*>>(&key.universalId);
+		return std::get<not_null<PhotoData*>>(key.universalId);
 	}
 
 	bool isolatedInSlice() const {

Telegram/SourceFiles/data/data_web_page.h

@@ -29,7 +29,7 @@ enum class WebPageType {
 WebPageType ParseWebPageType(const MTPDwebPage &type);
 
 struct WebPageCollage {
-	using Item = base::variant<PhotoData*, DocumentData*>;
+	using Item = std::variant<PhotoData*, DocumentData*>;
 
 	WebPageCollage() = default;
 	explicit WebPageCollage(

Telegram/SourceFiles/export/data/export_data_types.cpp

@@ -786,10 +786,10 @@ Utf8String User::name() const {
 }
 
 const User *Peer::user() const {
-	return base::get_if<User>(&data);
+	return std::get_if<User>(&data);
 }
 const Chat *Peer::chat() const {
-	return base::get_if<Chat>(&data);
+	return std::get_if<Chat>(&data);
 }
 
 PeerId Peer::id() const {

Telegram/SourceFiles/export/data/export_data_types.h

@@ -240,7 +240,7 @@ struct Peer {
 	const User *user() const;
 	const Chat *chat() const;
 
-	base::variant<User, Chat> data;
+	std::variant<User, Chat> data;
 
 };
 

Telegram/SourceFiles/export/output/export_output_html.cpp

@@ -1090,7 +1090,7 @@ auto HtmlWriter::Wrap::pushMessage(
 		return serviceFrom + " joined Telegram";
 	}, [&](const ActionPhoneNumberRequest &data) {
 		return serviceFrom + " requested your phone number";
-	}, [](std::nullopt_t) { return QByteArray(); });
+	}, [](v::null_t) { return QByteArray(); });
 
 	if (!serviceText.isEmpty()) {
 		const auto &content = message.action.content;
@@ -1753,7 +1753,7 @@ MediaData HtmlWriter::Wrap::prepareMediaData(
 	}, [](const Poll &data) {
 	}, [](const UnsupportedMedia &data) {
 		Unexpected("Unsupported message.");
-	}, [](std::nullopt_t) {});
+	}, [](v::null_t) {});
 	return result;
 }
 

Telegram/SourceFiles/export/output/export_output_json.cpp

@@ -471,7 +471,7 @@ QByteArray SerializeMessage(
 	}, [&](const ActionPhoneNumberRequest &data) {
 		pushActor();
 		pushAction("requested_phone_number");
-	}, [](std::nullopt_t) {});
+	}, [](v::null_t) {});
 
 	if (!message.action.content) {
 		pushFrom();
@@ -612,7 +612,7 @@ QByteArray SerializeMessage(
 		}));
 	}, [](const UnsupportedMedia &data) {
 		Unexpected("Unsupported message.");
-	}, [](std::nullopt_t) {});
+	}, [](v::null_t) {});
 
 	pushBare("text", SerializeText(context, message.text));
 

Telegram/SourceFiles/export/output/export_output_text.cpp

@@ -338,7 +338,7 @@ QByteArray SerializeMessage(
 	}, [&](const ActionPhoneNumberRequest &data) {
 		pushActor();
 		pushAction("Request Phone Number");
-	}, [](std::nullopt_t) {});
+	}, [](v::null_t) {});
 
 	if (!message.action.content) {
 		pushFrom();
@@ -456,7 +456,7 @@ QByteArray SerializeMessage(
 		}
 	}, [](const UnsupportedMedia &data) {
 		Unexpected("Unsupported message.");
-	}, [](std::nullopt_t) {});
+	}, [](v::null_t) {});
 
 	auto value = JoinList(QByteArray(), ranges::view::all(
 		message.text

Telegram/SourceFiles/history/view/media/history_view_gif.cpp

@@ -1444,7 +1444,7 @@ void Gif::setStreamed(std::unique_ptr<Streamed> value) {
 void Gif::handleStreamingUpdate(::Media::Streaming::Update &&update) {
 	using namespace ::Media::Streaming;
 
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		streamingReady(std::move(update));
 	}, [&](const PreloadedVideo &update) {
 	}, [&](const UpdateVideo &update) {

Telegram/SourceFiles/history/view/media/history_view_photo.cpp

@@ -704,7 +704,7 @@ void Photo::setStreamed(std::unique_ptr<Streamed> value) {
 void Photo::handleStreamingUpdate(::Media::Streaming::Update &&update) {
 	using namespace ::Media::Streaming;
 
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		streamingReady(std::move(update));
 	}, [&](const PreloadedVideo &update) {
 	}, [&](const UpdateVideo &update) {

Telegram/SourceFiles/history/view/media/history_view_sticker.cpp

@@ -313,7 +313,7 @@ void Sticker::lottieCreated() {
 
 	_lottie->updates(
 	) | rpl::start_with_next([=](Lottie::Update update) {
-		update.data.match([&](const Lottie::Information &information) {
+		v::match(update.data, [&](const Lottie::Information &information) {
 			_parent->history()->owner().requestViewResize(_parent);
 		}, [&](const Lottie::DisplayFrameRequest &request) {
 			_parent->history()->owner().requestViewRepaint(_parent);

Telegram/SourceFiles/history/view/media/history_view_web_page.cpp

@@ -53,11 +53,11 @@ std::vector<std::unique_ptr<Data::Media>> PrepareCollageMedia(
 	auto result = std::vector<std::unique_ptr<Data::Media>>();
 	result.reserve(data.items.size());
 	for (const auto item : data.items) {
-		if (const auto document = base::get_if<DocumentData*>(&item)) {
+		if (const auto document = std::get_if<DocumentData*>(&item)) {
 			result.push_back(std::make_unique<Data::MediaFile>(
 				parent,
 				*document));
-		} else if (const auto photo = base::get_if<PhotoData*>(&item)) {
+		} else if (const auto photo = std::get_if<PhotoData*>(&item)) {
 			result.push_back(std::make_unique<Data::MediaPhoto>(
 				parent,
 				*photo));

Telegram/SourceFiles/info/info_controller.cpp

@@ -40,7 +40,7 @@ Key::Key(not_null<PollData*> poll, FullMsgId contextId)
 }
 
 PeerData *Key::peer() const {
-	if (const auto peer = base::get_if<not_null<PeerData*>>(&_value)) {
+	if (const auto peer = std::get_if<not_null<PeerData*>>(&_value)) {
 		return *peer;
 	}
 	return nullptr;
@@ -54,21 +54,21 @@ PeerData *Key::peer() const {
 //}
 
 UserData *Key::settingsSelf() const {
-	if (const auto tag = base::get_if<Settings::Tag>(&_value)) {
+	if (const auto tag = std::get_if<Settings::Tag>(&_value)) {
 		return tag->self;
 	}
 	return nullptr;
 }
 
 PollData *Key::poll() const {
-	if (const auto data = base::get_if<PollKey>(&_value)) {
+	if (const auto data = std::get_if<PollKey>(&_value)) {
 		return data->poll;
 	}
 	return nullptr;
 }
 
 FullMsgId Key::pollContextId() const {
-	if (const auto data = base::get_if<PollKey>(&_value)) {
+	if (const auto data = std::get_if<PollKey>(&_value)) {
 		return data->contextId;
 	}
 	return FullMsgId();

Telegram/SourceFiles/info/info_controller.h

@@ -46,7 +46,7 @@ private:
 		not_null<PollData*> poll;
 		FullMsgId contextId;
 	};
-	base::variant<
+	std::variant<
 		not_null<PeerData*>,
 		//not_null<Data::Feed*>, // #feed
 		Settings::Tag,

Telegram/SourceFiles/media/player/media_player_instance.cpp

@@ -758,7 +758,7 @@ void Instance::handleStreamingUpdate(
 		Streaming::Update &&update) {
 	using namespace Streaming;
 
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		if (!update.video.size.isEmpty()) {
 			data->streamed->progress.setValueChangedCallback([=](
 					float64,

Telegram/SourceFiles/media/streaming/media_streaming_common.h

@@ -96,7 +96,7 @@ struct Finished {
 };
 
 struct Update {
-	base::variant<
+	std::variant<
 		Information,
 		PreloadedVideo,
 		UpdateVideo,

Telegram/SourceFiles/media/streaming/media_streaming_document.cpp

@@ -138,7 +138,7 @@ Ui::RadialState Document::waitingState() const {
 }
 
 void Document::handleUpdate(Update &&update) {
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		ready(std::move(update));
 	}, [&](const PreloadedVideo &update) {
 		_info.video.state.receivedTill = update.till;

Telegram/SourceFiles/media/streaming/media_streaming_file.cpp

@@ -228,7 +228,7 @@ void File::Context::seekToPosition(
 	return logFatal(qstr("av_seek_frame"), error);
 }
 
-base::variant<FFmpeg::Packet, FFmpeg::AvErrorWrap> File::Context::readPacket() {
+std::variant<FFmpeg::Packet, FFmpeg::AvErrorWrap> File::Context::readPacket() {
 	auto error = FFmpeg::AvErrorWrap();
 
 	auto result = FFmpeg::Packet();
@@ -312,7 +312,7 @@ void File::Context::readNextPacket() {
 	auto result = readPacket();
 	if (unroll()) {
 		return;
-	} else if (const auto packet = base::get_if<FFmpeg::Packet>(&result)) {
+	} else if (const auto packet = std::get_if<FFmpeg::Packet>(&result)) {
 		const auto index = packet->fields().stream_index;
 		const auto i = _queuedPackets.find(index);
 		if (i == end(_queuedPackets)) {
@@ -325,8 +325,8 @@ void File::Context::readNextPacket() {
 		Assert(i->second.size() < kMaxQueuedPackets);
 	} else {
 		// Still trying to read by drain.
-		Assert(result.is<FFmpeg::AvErrorWrap>());
+		Assert(v::is<FFmpeg::AvErrorWrap>(result));
-		Assert(result.get<FFmpeg::AvErrorWrap>().code() == AVERROR_EOF);
+		Assert(std::get<FFmpeg::AvErrorWrap>(result).code() == AVERROR_EOF);
 		processQueuedPackets(SleepPolicy::Allowed);
 		if (!finished()) {
 			handleEndOfFile();

Telegram/SourceFiles/media/streaming/media_streaming_file.h

@@ -82,7 +82,7 @@ private:
 
 		// TODO base::expected.
 		[[nodiscard]] auto readPacket()
-		-> base::variant<FFmpeg::Packet, FFmpeg::AvErrorWrap>;
+		-> std::variant<FFmpeg::Packet, FFmpeg::AvErrorWrap>;
 		void processQueuedPackets(SleepPolicy policy);
 
 		void handleEndOfFile();

Telegram/SourceFiles/media/streaming/media_streaming_loader_mtproto.cpp

@@ -31,7 +31,9 @@ LoaderMtproto::LoaderMtproto(
 }
 
 Storage::Cache::Key LoaderMtproto::baseCacheKey() const {
-	return location().data.get<StorageFileLocation>().bigFileBaseCacheKey();
+	return std::get<StorageFileLocation>(
+		location().data
+	).bigFileBaseCacheKey();
 }
 
 int LoaderMtproto::size() const {

Telegram/SourceFiles/media/streaming/media_streaming_video_track.cpp

@@ -239,7 +239,7 @@ void VideoTrackObject::readFrames() {
 			if (delay != kTimeUnknown) {
 				queueReadFrames(delay);
 			}
-		}, [](std::nullopt_t) {
+		}, [](v::null_t) {
 		});
 		if (result.has_value()) {
 			break;
@@ -258,12 +258,12 @@ auto VideoTrackObject::readEnoughFrames(crl::time trackTime)
 				return result;
 			} else if (!dropStaleFrames
 				|| !VideoTrack::IsStale(frame, trackTime)) {
-				return std::nullopt;
+				return v::null;
 			}
 		}
 	}, [&](Shared::PrepareNextCheck delay) -> ReadEnoughState {
 		return delay;
-	}, [&](std::nullopt_t) -> ReadEnoughState {
+	}, [&](v::null_t) -> ReadEnoughState {
 		return FrameResult::Done;
 	});
 }

Telegram/SourceFiles/media/view/media_view_group_thumbs.cpp

@@ -38,7 +38,7 @@ using Context = GroupThumbs::Context;
 using Key = GroupThumbs::Key;
 
 Data::FileOrigin ComputeFileOrigin(const Key &key, const Context &context) {
-	return key.match([&](PhotoId photoId) {
+	return v::match(key, [&](PhotoId photoId) {
 		return context.match([&](PeerId peerId) {
 			return peerIsUser(peerId)
 				? Data::FileOriginUserPhoto(peerToUser(peerId), photoId)
@@ -64,12 +64,12 @@ Context ComputeContext(
 	Expects(index >= 0 && index < slice.size());
 
 	const auto value = slice[index];
-	if (const auto photo = base::get_if<not_null<PhotoData*>>(&value)) {
+	if (const auto photo = std::get_if<not_null<PhotoData*>>(&value)) {
 		if (const auto peer = (*photo)->peer) {
 			return peer->id;
 		}
-		return std::nullopt;
+		return v::null;
-	} else if (const auto msgId = base::get_if<FullMsgId>(&value)) {
+	} else if (const auto msgId = std::get_if<FullMsgId>(&value)) {
 		if (const auto item = session->data().message(*msgId)) {
 			if (!item->toHistoryMessage()) {
 				return item->history()->peer->id;
@@ -77,7 +77,7 @@ Context ComputeContext(
 				return groupId;
 			}
 		}
-		return std::nullopt;
+		return v::null;
 	}
 	Unexpected("Variant in ComputeContext(SharedMediaWithLastSlice::Value)");
 }
@@ -100,9 +100,9 @@ Key ComputeKey(const SharedMediaWithLastSlice &slice, int index) {
 	Expects(index >= 0 && index < slice.size());
 
 	const auto value = slice[index];
-	if (const auto photo = base::get_if<not_null<PhotoData*>>(&value)) {
+	if (const auto photo = std::get_if<not_null<PhotoData*>>(&value)) {
 		return (*photo)->id;
-	} else if (const auto msgId = base::get_if<FullMsgId>(&value)) {
+	} else if (const auto msgId = std::get_if<FullMsgId>(&value)) {
 		return *msgId;
 	}
 	Unexpected("Variant in ComputeKey(SharedMediaWithLastSlice::Value)");
@@ -564,10 +564,10 @@ void GroupThumbs::animatePreviouslyAlive(
 
 auto GroupThumbs::createThumb(Key key)
 -> std::unique_ptr<Thumb> {
-	if (const auto photoId = base::get_if<PhotoId>(&key)) {
+	if (const auto photoId = std::get_if<PhotoId>(&key)) {
 		const auto photo = _session->data().photo(*photoId);
 		return createThumb(key, photo);
-	} else if (const auto msgId = base::get_if<FullMsgId>(&key)) {
+	} else if (const auto msgId = std::get_if<FullMsgId>(&key)) {
 		if (const auto item = _session->data().message(*msgId)) {
 			if (const auto media = item->media()) {
 				if (const auto photo = media->photo()) {
@@ -578,7 +578,7 @@ auto GroupThumbs::createThumb(Key key)
 			}
 		}
 		return createThumb(key, nullptr);
-	} else if (const auto collageKey = base::get_if<CollageKey>(&key)) {
+	} else if (const auto collageKey = std::get_if<CollageKey>(&key)) {
 		if (const auto itemId = base::get_if<FullMsgId>(&_context)) {
 			if (const auto item = _session->data().message(*itemId)) {
 				if (const auto media = item->media()) {
@@ -605,9 +605,9 @@ auto GroupThumbs::createThumb(
 		return createThumb(key, nullptr);
 	}
 	const auto &item = collage.items[index];
-	if (const auto photo = base::get_if<PhotoData*>(&item)) {
+	if (const auto photo = std::get_if<PhotoData*>(&item)) {
 		return createThumb(key, (*photo));
-	} else if (const auto document = base::get_if<DocumentData*>(&item)) {
+	} else if (const auto document = std::get_if<DocumentData*>(&item)) {
 		return createThumb(key, (*document));
 	}
 	return createThumb(key, nullptr);

Telegram/SourceFiles/media/view/media_view_group_thumbs.h

@@ -37,7 +37,7 @@ public:
 
 		int size() const;
 	};
-	using Key = base::variant<PhotoId, FullMsgId, CollageKey>;
+	using Key = std::variant<PhotoId, FullMsgId, CollageKey>;
 
 	static void Refresh(
 		not_null<Main::Session*> session,

Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp

@@ -1116,7 +1116,7 @@ void OverlayWidget::clearSession() {
 	clearStreaming();
 	delete _menu;
 	_menu = nullptr;
-	setContext(std::nullopt);
+	setContext(v::null);
 	_from = nullptr;
 	_fromName = QString();
 	assignMediaPointer(nullptr);
@@ -1589,7 +1589,7 @@ auto OverlayWidget::sharedMediaKey() const -> std::optional<SharedMediaKey> {
 			_history->peer->id,
 			_migrated ? _migrated->peer->id : 0,
 			SharedMediaType::ChatPhoto,
-			_peer->userpicPhotoId()
+			_photo
 		};
 	}
 	if (!IsServerMsgId(_msgid.msg)) {
@@ -1947,12 +1947,12 @@ void OverlayWidget::initGroupThumbs() {
 	_groupThumbs->activateRequests(
 	) | rpl::start_with_next([this](View::GroupThumbs::Key key) {
 		using CollageKey = View::GroupThumbs::CollageKey;
-		if (const auto photoId = base::get_if<PhotoId>(&key)) {
+		if (const auto photoId = std::get_if<PhotoId>(&key)) {
 			const auto photo = _session->data().photo(*photoId);
 			moveToEntity({ photo, nullptr });
-		} else if (const auto itemId = base::get_if<FullMsgId>(&key)) {
+		} else if (const auto itemId = std::get_if<FullMsgId>(&key)) {
 			moveToEntity(entityForItemId(*itemId));
-		} else if (const auto collageKey = base::get_if<CollageKey>(&key)) {
+		} else if (const auto collageKey = std::get_if<CollageKey>(&key)) {
 			if (_collageData) {
 				moveToEntity(entityForCollage(collageKey->index));
 			}
@@ -1990,7 +1990,7 @@ void OverlayWidget::showPhoto(
 	if (context) {
 		setContext(context);
 	} else {
-		setContext(std::nullopt);
+		setContext(v::null);
 	}
 
 	clearControlsState();
@@ -2039,7 +2039,7 @@ void OverlayWidget::showDocument(
 	if (context) {
 		setContext(context);
 	} else {
-		setContext(std::nullopt);
+		setContext(v::null);
 	}
 
 	clearControlsState();
@@ -2490,7 +2490,7 @@ QImage OverlayWidget::transformStaticContent(QPixmap content) const {
 void OverlayWidget::handleStreamingUpdate(Streaming::Update &&update) {
 	using namespace Streaming;
 
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		streamingReady(std::move(update));
 	}, [&](const PreloadedVideo &update) {
 		updatePlaybackState();
@@ -3535,29 +3535,29 @@ OverlayWidget::Entity OverlayWidget::entityForUserPhotos(int index) const {
 	Expects(_session != nullptr);
 
 	if (index < 0 || index >= _userPhotosData->size()) {
-		return { std::nullopt, nullptr };
+		return { v::null, nullptr };
 	}
 	const auto id = (*_userPhotosData)[index];
 	if (const auto photo = _session->data().photo(id)) {
 		return { photo, nullptr };
 	}
-	return { std::nullopt, nullptr };
+	return { v::null, nullptr };
 }
 
 OverlayWidget::Entity OverlayWidget::entityForSharedMedia(int index) const {
 	Expects(_sharedMediaData.has_value());
 
 	if (index < 0 || index >= _sharedMediaData->size()) {
-		return { std::nullopt, nullptr };
+		return { v::null, nullptr };
 	}
 	auto value = (*_sharedMediaData)[index];
-	if (const auto photo = base::get_if<not_null<PhotoData*>>(&value)) {
+	if (const auto photo = std::get_if<not_null<PhotoData*>>(&value)) {
 		// Last peer photo.
 		return { *photo, nullptr };
-	} else if (const auto itemId = base::get_if<FullMsgId>(&value)) {
+	} else if (const auto itemId = std::get_if<FullMsgId>(&value)) {
 		return entityForItemId(*itemId);
 	}
-	return { std::nullopt, nullptr };
+	return { v::null, nullptr };
 }
 
 OverlayWidget::Entity OverlayWidget::entityForCollage(int index) const {
@@ -3567,14 +3567,14 @@ OverlayWidget::Entity OverlayWidget::entityForCollage(int index) const {
 	const auto item = _session->data().message(_msgid);
 	const auto &items = _collageData->items;
 	if (!item || index < 0 || index >= items.size()) {
-		return { std::nullopt, nullptr };
+		return { v::null, nullptr };
 	}
-	if (const auto document = base::get_if<DocumentData*>(&items[index])) {
+	if (const auto document = std::get_if<DocumentData*>(&items[index])) {
 		return { *document, item };
-	} else if (const auto photo = base::get_if<PhotoData*>(&items[index])) {
+	} else if (const auto photo = std::get_if<PhotoData*>(&items[index])) {
 		return { *photo, item };
 	}
-	return { std::nullopt, nullptr };
+	return { v::null, nullptr };
 }
 
 OverlayWidget::Entity OverlayWidget::entityForItemId(const FullMsgId &itemId) const {
@@ -3588,9 +3588,9 @@ OverlayWidget::Entity OverlayWidget::entityForItemId(const FullMsgId &itemId) co
 				return { document, item };
 			}
 		}
-		return { std::nullopt, item };
+		return { v::null, item };
 	}
-	return { std::nullopt, nullptr };
+	return { v::null, nullptr };
 }
 
 OverlayWidget::Entity OverlayWidget::entityByIndex(int index) const {
@@ -3601,7 +3601,7 @@ OverlayWidget::Entity OverlayWidget::entityByIndex(int index) const {
 	} else if (_collageData) {
 		return entityForCollage(index);
 	}
-	return { std::nullopt, nullptr };
+	return { v::null, nullptr };
 }
 
 void OverlayWidget::setContext(
@@ -3689,7 +3689,7 @@ bool OverlayWidget::moveToEntity(const Entity &entity, int preloadDelta) {
 	} else if (_peer) {
 		setContext(_peer);
 	} else {
-		setContext(std::nullopt);
+		setContext(v::null);
 	}
 	clearStreaming();
 	_streamingStartPaused = false;

Telegram/SourceFiles/media/view/media_view_pip.cpp

@@ -1326,7 +1326,7 @@ void Pip::paintPlaybackTexts(QPainter &p) const {
 void Pip::handleStreamingUpdate(Streaming::Update &&update) {
 	using namespace Streaming;
 
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		_panel.setAspectRatio(
 			FlipSizeByRotation(update.video.size, _rotation));
 	}, [&](const PreloadedVideo &update) {

Telegram/SourceFiles/mtproto/sender.h

@@ -162,12 +162,18 @@ class Sender {
 			return std::move(_done);
 		}
 		RPCFailHandlerPtr takeOnFail() {
-			if (auto handler = base::get_if<FailPlainHandler>(&_fail)) {
+			return v::match(_fail, [&](FailPlainHandler &value)
-				return std::make_shared<FailHandler<FailPlainPolicy>>(_sender, std::move(*handler), _failSkipPolicy);
+			-> RPCFailHandlerPtr {
-			} else if (auto handler = base::get_if<FailRequestIdHandler>(&_fail)) {
+				return std::make_shared<FailHandler<FailPlainPolicy>>(
-				return std::make_shared<FailHandler<FailRequestIdPolicy>>(_sender, std::move(*handler), _failSkipPolicy);
+					_sender,
-			}
+					std::move(value),
-			return RPCFailHandlerPtr();
+					_failSkipPolicy);
+			}, [&](FailRequestIdHandler &value) -> RPCFailHandlerPtr {
+				return std::make_shared<FailHandler<FailRequestIdPolicy>>(
+					_sender,
+					std::move(value),
+					_failSkipPolicy);
+			});
 		}
 		mtpRequestId takeAfter() const noexcept {
 			return _afterRequestId;
@@ -185,7 +191,7 @@ class Sender {
 		ShiftedDcId _dcId = 0;
 		crl::time _canWait = 0;
 		RPCDoneHandlerPtr _done;
-		base::variant<FailPlainHandler, FailRequestIdHandler> _fail;
+		std::variant<FailPlainHandler, FailRequestIdHandler> _fail;
 		FailSkipPolicy _failSkipPolicy = FailSkipPolicy::Simple;
 		mtpRequestId _afterRequestId = 0;
 

Telegram/SourceFiles/passport/passport_panel_controller.h

@@ -64,7 +64,7 @@ struct ScopeError {
 	// FileKey - file_hash error (bad scan / selfie / translation)
 	// General - general value error (or scan / translation missing)
 	// QString - data_hash with such key error (bad value)
-	base::variant<FileKey, General, QString> key;
+	std::variant<FileKey, General, QString> key;
 	QString text;
 };
 

Telegram/SourceFiles/passport/passport_panel_edit_scans.cpp

@@ -37,7 +37,7 @@ constexpr auto kJpegQuality = 89;
 
 static_assert(kMaxSize <= Storage::kUseBigFilesFrom);
 
-base::variant<ReadScanError, QByteArray> ProcessImage(QByteArray &&bytes) {
+std::variant<ReadScanError, QByteArray> ProcessImage(QByteArray &&bytes) {
 	auto image = App::readImage(base::take(bytes));
 	if (image.isNull()) {
 		return ReadScanError::CantReadImage;
@@ -901,10 +901,10 @@ void EditScans::ChooseScan(
 			remainingFiles = std::move(remainingFiles)
 		]() mutable {
 			auto result = ProcessImage(std::move(bytes));
-			if (const auto error = base::get_if<ReadScanError>(&result)) {
+			if (const auto error = std::get_if<ReadScanError>(&result)) {
 				onMainError(*error);
 			} else {
-				auto content = base::get_if<QByteArray>(&result);
+				auto content = std::get_if<QByteArray>(&result);
 				Assert(content != nullptr);
 				crl::on_main([
 					=,

Telegram/SourceFiles/platform/mac/notifications_manager_mac.mm

@@ -216,7 +216,11 @@ private:
 	};
 	struct ClearFinish {
 	};
-	using ClearTask = base::variant<ClearFromHistory, ClearFromSession, ClearAll, ClearFinish>;
+	using ClearTask = std::variant<
+		ClearFromHistory,
+		ClearFromSession,
+		ClearAll,
+		ClearFinish>;
 	std::vector<ClearTask> _clearingTasks;
 
 };
@@ -285,21 +289,20 @@ void Manager::Private::clearingThreadLoop() {
 		auto clearFromSessions = base::flat_set<uint64>();
 		{
 			std::unique_lock<std::mutex> lock(_clearingMutex);
-
 			while (_clearingTasks.empty()) {
 				_clearingCondition.wait(lock);
 			}
 			for (auto &task : _clearingTasks) {
-				if (base::get_if<ClearFinish>(&task)) {
+				v::match(task, [&](ClearFinish) {
 					finished = true;
 					clearAll = true;
-				} else if (base::get_if<ClearAll>(&task)) {
+				}, [&](ClearAll) {
 					clearAll = true;
-				} else if (auto fromHistory = base::get_if<ClearFromHistory>(&task)) {
+				}, [&](const ClearFromHistory &value) {
-					clearFromPeers.emplace(fromHistory->fullPeer);
+					clearFromPeers.emplace(value.fullPeer);
-				} else if (auto fromSession = base::get_if<ClearFromSession>(&task)) {
+				}, [&](const ClearFromSession &value) {
-					clearFromSessions.emplace(fromSession->sessionId);
+					clearFromSessions.emplace(value.sessionId);
-				}
+				});
 			}
 			_clearingTasks.clear();
 		}

Telegram/SourceFiles/storage/download_manager_mtproto.cpp

@@ -442,7 +442,7 @@ Data::FileOrigin DownloadMtprotoTask::fileOrigin() const {
 }
 
 uint64 DownloadMtprotoTask::objectId() const {
-	if (const auto v = base::get_if<StorageFileLocation>(&_location.data)) {
+	if (const auto v = std::get_if<StorageFileLocation>(&_location.data)) {
 		return v->objectId();
 	}
 	return 0;
@@ -456,7 +456,7 @@ void DownloadMtprotoTask::refreshFileReferenceFrom(
 		const Data::UpdatedFileReferences &updates,
 		int requestId,
 		const QByteArray &current) {
-	if (const auto v = base::get_if<StorageFileLocation>(&_location.data)) {
+	if (const auto v = std::get_if<StorageFileLocation>(&_location.data)) {
 		v->refreshFileReference(updates);
 		if (v->fileReference() == current) {
 			cancelOnFail();
@@ -525,7 +525,7 @@ mtpRequestId DownloadMtprotoTask::sendRequest(
 			cdnPartFailed(error, id);
 		}).toDC(shiftedDcId).send();
 	}
-	return _location.data.match([&](const WebFileLocation &location) {
+	return v::match(_location.data, [&](const WebFileLocation &location) {
 		return api().request(MTPupload_GetWebFile(
 			MTP_inputWebFileLocation(
 				MTP_bytes(location.url()),

Telegram/SourceFiles/storage/download_manager_mtproto.h

@@ -120,7 +120,7 @@ private:
 class DownloadMtprotoTask : public base::has_weak_ptr {
 public:
 	struct Location {
-		base::variant<
+		std::variant<
 			StorageFileLocation,
 			WebFileLocation,
 			GeoPointLocation> data;

Telegram/SourceFiles/storage/file_download.cpp

@@ -488,7 +488,7 @@ std::unique_ptr<FileLoader> CreateFileLoader(
 		bool autoLoading,
 		uint8 cacheTag) {
 	auto result = std::unique_ptr<FileLoader>();
-	location.data.match([&](const StorageFileLocation &data) {
+	v::match(location.data, [&](const StorageFileLocation &data) {
 		result = std::make_unique<mtpFileLoader>(
 			session,
 			data,

Telegram/SourceFiles/storage/file_download_mtproto.cpp

@@ -179,7 +179,7 @@ void mtpFileLoader::cancelHook() {
 }
 
 Storage::Cache::Key mtpFileLoader::cacheKey() const {
-	return location().data.match([&](const WebFileLocation &location) {
+	return v::match(location().data, [&](const WebFileLocation &location) {
 		return Data::WebDocumentCacheKey(location);
 	}, [&](const GeoPointLocation &location) {
 		return Data::GeoPointCacheKey(location);

Telegram/SourceFiles/storage/file_download_web.cpp

@@ -44,7 +44,7 @@ struct Progress {
 	qint64 total = 0;
 };
 
-using Update = base::variant<Progress, QByteArray, Error>;
+using Update = std::variant<Progress, QByteArray, Error>;
 
 struct UpdateForLoader {
 	not_null<webFileLoader*> loader;
@@ -473,9 +473,9 @@ void webFileLoader::startLoading() {
 		_manager->updates(
 			this
 		) | rpl::start_with_next([=](const Update &data) {
-			if (const auto progress = base::get_if<Progress>(&data)) {
+			if (const auto progress = std::get_if<Progress>(&data)) {
 				loadProgress(progress->ready, progress->total);
-			} else if (const auto bytes = base::get_if<QByteArray>(&data)) {
+			} else if (const auto bytes = std::get_if<QByteArray>(&data)) {
 				loadFinished(*bytes);
 			} else {
 				loadFailed();

Telegram/SourceFiles/storage/serialize_document.cpp

@@ -144,7 +144,7 @@ DocumentData *Document::readFromStreamHelper(
 		}
 	}
 
-	const auto storage = base::get_if<StorageFileLocation>(
+	const auto storage = std::get_if<StorageFileLocation>(
 		&thumb->file().data);
 	if ((stream.status() != QDataStream::Ok)
 		|| (!dc && !access)

Telegram/SourceFiles/storage/storage_cloud_blob.cpp

@@ -69,7 +69,7 @@ bool UnpackBlob(
 }
 
 QString StateDescription(const BlobState &state, tr::phrase<> activeText) {
-	return state.match([](const Available &data) {
+	return v::match(state, [](const Available &data) {
 		return tr::lng_emoji_set_download(
 			tr::now,
 			lt_size,

Telegram/SourceFiles/storage/storage_cloud_blob.h

@@ -65,7 +65,7 @@ struct Failed {
 };
 
 using Loading = MTP::DedicatedLoader::Progress;
-using BlobState = base::variant<
+using BlobState = std::variant<
 	Available,
 	Ready,
 	Active,

Telegram/SourceFiles/ui/image/image_location.cpp

@@ -621,7 +621,7 @@ InMemoryKey inMemoryKey(const InMemoryLocation &location) {
 }
 
 InMemoryKey inMemoryKey(const DownloadLocation &location) {
-	return location.data.match([](const auto &data) {
+	return v::match(location.data, [](const auto &data) {
 		return inMemoryKey(data);
 	});
 }
@@ -681,8 +681,8 @@ std::optional<StorageImageLocation> StorageImageLocation::FromSerialized(
 }
 
 QByteArray DownloadLocation::serialize() const {
-	if (!valid() || data.is<StorageFileLocation>()) {
+	if (!valid() || v::is<StorageFileLocation>(data)) {
-		return data.get_unchecked<StorageFileLocation>().serialize();
+		return std::get<StorageFileLocation>(data).serialize();
 	}
 	auto result = QByteArray();
 	auto buffer = QBuffer(&result);
@@ -691,7 +691,7 @@ QByteArray DownloadLocation::serialize() const {
 	stream.setVersion(QDataStream::Qt_5_1);
 	stream << quint16(0) << kNonStorageLocationToken;
 
-	data.match([&](const StorageFileLocation &data) {
+	v::match(data, [&](const StorageFileLocation &data) {
 		Unexpected("Variant in DownloadLocation::serialize.");
 	}, [&](const WebFileLocation &data) {
 		stream
@@ -718,11 +718,11 @@ QByteArray DownloadLocation::serialize() const {
 }
 
 int DownloadLocation::serializeSize() const {
-	if (!valid() || data.is<StorageFileLocation>()) {
+	if (!valid() || v::is<StorageFileLocation>(data)) {
-		return data.get_unchecked<StorageFileLocation>().serializeSize();
+		return std::get<StorageFileLocation>(data).serializeSize();
 	}
 	auto result = sizeof(quint16) + sizeof(quint8) + sizeof(quint8);
-	data.match([&](const StorageFileLocation &data) {
+	v::match(data, [&](const StorageFileLocation &data) {
 		Unexpected("Variant in DownloadLocation::serializeSize.");
 	}, [&](const WebFileLocation &data) {
 		result += Serialize::bytearraySize(data.url()) + sizeof(quint64);
@@ -809,15 +809,15 @@ DownloadLocation DownloadLocation::convertToModern(
 		StorageFileLocation::Type type,
 		uint64 id,
 		uint64 accessHash) const {
-	if (!data.is<StorageFileLocation>()) {
+	if (!v::is<StorageFileLocation>(data)) {
 		return *this;
 	}
-	auto &file = data.get_unchecked<StorageFileLocation>();
+	auto &file = std::get<StorageFileLocation>(data);
 	return DownloadLocation{ file.convertToModern(type, id, accessHash) };
 }
 
 Storage::Cache::Key DownloadLocation::cacheKey() const {
-	return data.match([](const GeoPointLocation &data) {
+	return v::match(data, [](const GeoPointLocation &data) {
 		return Data::GeoPointCacheKey(data);
 	}, [](const StorageFileLocation &data) {
 		return data.valid()
@@ -837,13 +837,13 @@ Storage::Cache::Key DownloadLocation::cacheKey() const {
 }
 
 Storage::Cache::Key DownloadLocation::bigFileBaseCacheKey() const {
-	return data.is<StorageFileLocation>()
+	return v::is<StorageFileLocation>(data)
-		? data.get_unchecked<StorageFileLocation>().bigFileBaseCacheKey()
+		? std::get<StorageFileLocation>(data).bigFileBaseCacheKey()
 		: Storage::Cache::Key();
 }
 
 bool DownloadLocation::valid() const {
-	return data.match([](const GeoPointLocation &data) {
+	return v::match(data, [](const GeoPointLocation &data) {
 		return true;
 	}, [](const StorageFileLocation &data) {
 		return data.valid();
@@ -857,32 +857,32 @@ bool DownloadLocation::valid() const {
 }
 
 bool DownloadLocation::isLegacy() const {
-	return data.is<StorageFileLocation>()
+	return v::is<StorageFileLocation>(data)
-		? data.get_unchecked<StorageFileLocation>().isLegacy()
+		? std::get<StorageFileLocation>(data).isLegacy()
 		: false;
 }
 
 QByteArray DownloadLocation::fileReference() const {
-	if (!data.is<StorageFileLocation>()) {
+	if (!v::is<StorageFileLocation>(data)) {
 		return QByteArray();
 	}
-	return data.get_unchecked<StorageFileLocation>().fileReference();
+	return std::get<StorageFileLocation>(data).fileReference();
 }
 
 bool DownloadLocation::refreshFileReference(const QByteArray &data) {
-	if (!this->data.is<StorageFileLocation>()) {
+	if (!v::is<StorageFileLocation>(this->data)) {
 		return false;
 	}
-	auto &file = this->data.get_unchecked<StorageFileLocation>();
+	auto &file = std::get<StorageFileLocation>(this->data);
 	return file.refreshFileReference(data);
 }
 
 bool DownloadLocation::refreshFileReference(
 	const Data::UpdatedFileReferences &updates) {
-	if (!data.is<StorageFileLocation>()) {
+	if (!v::is<StorageFileLocation>(data)) {
 		return false;
 	}
-	auto &file = data.get_unchecked<StorageFileLocation>();
+	auto &file = std::get<StorageFileLocation>(data);
 	return file.refreshFileReference(updates);
 }
 

Telegram/SourceFiles/ui/image/image_location.h

@@ -446,7 +446,7 @@ inline bool operator>=(
 
 class DownloadLocation {
 public:
-	base::variant<
+	std::variant<
 		StorageFileLocation,
 		WebFileLocation,
 		GeoPointLocation,

Telegram/SourceFiles/ui/special_buttons.cpp

@@ -865,7 +865,7 @@ void UserpicButton::clearStreaming() {
 void UserpicButton::handleStreamingUpdate(Media::Streaming::Update &&update) {
 	using namespace Media::Streaming;
 
-	update.data.match([&](Information &update) {
+	v::match(update.data, [&](Information &update) {
 		streamingReady(std::move(update));
 	}, [&](const PreloadedVideo &update) {
 	}, [&](const UpdateVideo &update) {

Telegram/SourceFiles/window/window_media_preview.cpp

@@ -248,7 +248,7 @@ void MediaPreviewWidget::setupLottie() {
 
 	_lottie->updates(
 	) | rpl::start_with_next([=](Lottie::Update update) {
-		update.data.match([&](const Lottie::Information &) {
+		v::match(update.data, [&](const Lottie::Information &) {
 			this->update();
 		}, [&](const Lottie::DisplayFrameRequest &) {
 			this->update(updateArea());

Telegram/lib_base

@@ -1 +1 @@
-Subproject commit e94515700a622c2424f58d32e670581e9185f7e7
+Subproject commit 0060349806529cd517201bec2d25208ad8d0bb89

Telegram/lib_lottie

@@ -1 +1 @@
-Subproject commit b666e438be285b2781d93ac64138ab32ab4a85e0
+Subproject commit b060b25b45bf0100ae6d35f558eb0818380ebc13

Telegram/lib_rpl

@@ -1 +1 @@
-Subproject commit b58d2804acda906119c53c1fa1a2593fa9895878
+Subproject commit e654c5ee98199b47a426aaaf6a1f7331aca0ebcd

Telegram/lib_storage

@@ -1 +1 @@
-Subproject commit 538a72e5d3aedb660d3a399cc883067ada16e9cf
+Subproject commit 52b8d0456fec25f80ca96e6d354dd7583f7fa350