524 lines
19 KiB
C++
524 lines
19 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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#include "core/stl_subset.h"
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namespace base {
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namespace internal {
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template <typename Return, typename ...Args>
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struct lambda_wrap_helper_base {
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using construct_copy_other_type = void(*)(void *, const void *); // dst, src
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using construct_move_other_type = void(*)(void *, void *); // dst, src
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using call_type = Return(*)(const void *, Args...);
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using destruct_type = void(*)(const void *);
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lambda_wrap_helper_base() = delete;
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lambda_wrap_helper_base(const lambda_wrap_helper_base &other) = delete;
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lambda_wrap_helper_base &operator=(const lambda_wrap_helper_base &other) = delete;
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lambda_wrap_helper_base(
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construct_copy_other_type construct_copy_other,
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construct_move_other_type construct_move_other,
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call_type call,
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destruct_type destruct)
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: construct_copy_other(construct_copy_other)
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, construct_move_other(construct_move_other)
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, call(call)
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, destruct(destruct) {
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}
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const construct_copy_other_type construct_copy_other;
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const construct_move_other_type construct_move_other;
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const call_type call;
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const destruct_type destruct;
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static constexpr size_t kFullStorageSize = 24U + sizeof(void*);
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static constexpr size_t kStorageSize = kFullStorageSize - sizeof(void*);
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using alignment = uint64;
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template <typename Lambda>
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using IsLarge = std_::integral_constant<bool, !(sizeof(std_::decay_simple_t<Lambda>) <= kStorageSize)>;
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protected:
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static void bad_construct_copy(void *lambda, const void *source) {
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t_assert(!"base::lambda bad_construct_copy() called!");
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}
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};
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template <typename Return, typename ...Args>
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struct lambda_wrap_empty : public lambda_wrap_helper_base<Return, Args...> {
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static void construct_copy_other_method(void *lambda, const void *source) {
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}
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static void construct_move_other_method(void *lambda, void *source) {
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}
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static Return call_method(const void *lambda, Args... args) {
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t_assert(!"base::lambda empty call_method() called!");
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return Return();
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}
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static void destruct_method(const void *lambda) {
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}
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lambda_wrap_empty() : lambda_wrap_helper_base<Return, Args...>(
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&lambda_wrap_empty::construct_copy_other_method,
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&lambda_wrap_empty::construct_move_other_method,
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&lambda_wrap_empty::call_method,
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&lambda_wrap_empty::destruct_method) {
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}
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static const lambda_wrap_empty<Return, Args...> instance;
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};
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template <typename Return, typename ...Args>
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const lambda_wrap_empty<Return, Args...> lambda_wrap_empty<Return, Args...>::instance = {};
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template <typename Lambda, typename IsLarge, typename Return, typename ...Args> struct lambda_wrap_helper_move_impl;
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//
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// Disable large lambda support.
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// If you really need it, just store data in some std_::unique_ptr<struct>.
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//
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//template <typename Lambda, typename Return, typename ...Args>
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//struct lambda_wrap_helper_move_impl<Lambda, std_::true_type, Return, Args...> : public lambda_wrap_helper_base<Return, Args...> {
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// using JustLambda = std_::decay_simple_t<Lambda>;
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// using LambdaPtr = std_::unique_ptr<JustLambda>;
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// using Parent = lambda_wrap_helper_base<Return, Args...>;
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// static void construct_move_other_method(void *lambda, void *source) {
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// auto source_lambda = static_cast<LambdaPtr*>(source);
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// new (lambda) LambdaPtr(std_::move(*source_lambda));
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// }
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// static void construct_move_lambda_method(void *lambda, void *source) {
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// auto source_lambda = static_cast<JustLambda*>(source);
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// new (lambda) LambdaPtr(std_::make_unique<JustLambda>(static_cast<JustLambda&&>(*source_lambda)));
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// }
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// static Return call_method(const void *lambda, Args... args) {
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// return (**static_cast<const LambdaPtr*>(lambda))(std_::forward<Args>(args)...);
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// }
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// static void destruct_method(const void *lambda) {
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// static_cast<const LambdaPtr*>(lambda)->~LambdaPtr();
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// }
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// lambda_wrap_helper_move_impl() : Parent(
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// &Parent::bad_construct_copy,
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// &lambda_wrap_helper_move_impl::construct_move_other_method,
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// &lambda_wrap_helper_move_impl::call_method,
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// &lambda_wrap_helper_move_impl::destruct_method) {
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// }
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//
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//protected:
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// lambda_wrap_helper_move_impl(
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// typename Parent::construct_copy_other_type construct_copy_other
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// ) : Parent(
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// construct_copy_other,
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// &lambda_wrap_helper_move_impl::construct_move_other_method,
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// &lambda_wrap_helper_move_impl::call_method,
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// &lambda_wrap_helper_move_impl::destruct_method) {
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// }
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//
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//};
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template <typename Lambda, typename Return, typename ...Args>
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struct lambda_wrap_helper_move_impl<Lambda, std_::false_type, Return, Args...> : public lambda_wrap_helper_base<Return, Args...> {
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using JustLambda = std_::decay_simple_t<Lambda>;
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using Parent = lambda_wrap_helper_base<Return, Args...>;
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static void construct_move_other_method(void *lambda, void *source) {
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auto source_lambda = static_cast<JustLambda*>(source);
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new (lambda) JustLambda(static_cast<JustLambda&&>(*source_lambda));
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}
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static void construct_move_lambda_method(void *lambda, void *source) {
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static_assert(alignof(JustLambda) <= alignof(typename Parent::alignment), "Bad lambda alignment.");
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auto space = sizeof(JustLambda);
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auto aligned = std_::align(alignof(JustLambda), space, lambda, space);
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t_assert(aligned == lambda);
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auto source_lambda = static_cast<JustLambda*>(source);
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new (lambda) JustLambda(static_cast<JustLambda&&>(*source_lambda));
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}
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static Return call_method(const void *lambda, Args... args) {
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return (*static_cast<const JustLambda*>(lambda))(std_::forward<Args>(args)...);
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}
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static void destruct_method(const void *lambda) {
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static_cast<const JustLambda*>(lambda)->~JustLambda();
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}
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lambda_wrap_helper_move_impl() : Parent(
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&Parent::bad_construct_copy,
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&lambda_wrap_helper_move_impl::construct_move_other_method,
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&lambda_wrap_helper_move_impl::call_method,
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&lambda_wrap_helper_move_impl::destruct_method) {
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}
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protected:
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lambda_wrap_helper_move_impl(
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typename Parent::construct_copy_other_type construct_copy_other
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) : Parent(
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construct_copy_other,
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&lambda_wrap_helper_move_impl::construct_move_other_method,
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&lambda_wrap_helper_move_impl::call_method,
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&lambda_wrap_helper_move_impl::destruct_method) {
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}
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};
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template <typename Lambda, typename Return, typename ...Args>
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struct lambda_wrap_helper_move : public lambda_wrap_helper_move_impl<Lambda
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, typename lambda_wrap_helper_base<Return, Args...>::template IsLarge<Lambda>
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, Return, Args...> {
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static const lambda_wrap_helper_move instance;
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};
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template <typename Lambda, typename Return, typename ...Args>
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const lambda_wrap_helper_move<Lambda, Return, Args...> lambda_wrap_helper_move<Lambda, Return, Args...>::instance = {};
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template <typename Lambda, typename IsLarge, typename Return, typename ...Args> struct lambda_wrap_helper_copy_impl;
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//
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// Disable large lambda support.
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// If you really need it, just store data in some QSharedPointer<struct>.
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//
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//template <typename Lambda, typename Return, typename ...Args>
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//struct lambda_wrap_helper_copy_impl<Lambda, std_::true_type, Return, Args...> : public lambda_wrap_helper_move_impl<Lambda, std_::true_type, Return, Args...> {
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// using JustLambda = std_::decay_simple_t<Lambda>;
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// using LambdaPtr = std_::unique_ptr<JustLambda>;
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// using Parent = lambda_wrap_helper_move_impl<Lambda, std_::true_type, Return, Args...>;
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// static void construct_copy_other_method(void *lambda, const void *source) {
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// auto source_lambda = static_cast<const LambdaPtr*>(source);
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// new (lambda) LambdaPtr(std_::make_unique<JustLambda>(*source_lambda->get()));
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// }
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// static void construct_copy_lambda_method(void *lambda, const void *source) {
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// auto source_lambda = static_cast<const JustLambda*>(source);
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// new (lambda) LambdaPtr(std_::make_unique<JustLambda>(static_cast<const JustLambda &>(*source_lambda)));
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// }
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// lambda_wrap_helper_copy_impl() : Parent(&lambda_wrap_helper_copy_impl::construct_copy_other_method) {
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// }
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//
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//};
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template <typename Lambda, typename Return, typename ...Args>
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struct lambda_wrap_helper_copy_impl<Lambda, std_::false_type, Return, Args...> : public lambda_wrap_helper_move_impl<Lambda, std_::false_type, Return, Args...> {
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using JustLambda = std_::decay_simple_t<Lambda>;
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using Parent = lambda_wrap_helper_move_impl<Lambda, std_::false_type, Return, Args...>;
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static void construct_copy_other_method(void *lambda, const void *source) {
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auto source_lambda = static_cast<const JustLambda*>(source);
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new (lambda) JustLambda(static_cast<const JustLambda &>(*source_lambda));
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}
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static void construct_copy_lambda_method(void *lambda, const void *source) {
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static_assert(alignof(JustLambda) <= alignof(typename Parent::alignment), "Bad lambda alignment.");
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auto space = sizeof(JustLambda);
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auto aligned = std_::align(alignof(JustLambda), space, lambda, space);
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t_assert(aligned == lambda);
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auto source_lambda = static_cast<const JustLambda*>(source);
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new (lambda) JustLambda(static_cast<const JustLambda &>(*source_lambda));
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}
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lambda_wrap_helper_copy_impl() : Parent(&lambda_wrap_helper_copy_impl::construct_copy_other_method) {
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}
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};
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template <typename Lambda, typename Return, typename ...Args>
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struct lambda_wrap_helper_copy : public lambda_wrap_helper_copy_impl<Lambda
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, typename lambda_wrap_helper_base<Return, Args...>::template IsLarge<Lambda>
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, Return, Args...> {
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static const lambda_wrap_helper_copy instance;
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};
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template <typename Lambda, typename Return, typename ...Args>
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const lambda_wrap_helper_copy<Lambda, Return, Args...> lambda_wrap_helper_copy<Lambda, Return, Args...>::instance = {};
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} // namespace internal
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template <typename Function> class lambda;
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template <typename Function> class lambda_copy;
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template <typename Return, typename ...Args>
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class lambda<Return(Args...)> {
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using BaseHelper = internal::lambda_wrap_helper_base<Return, Args...>;
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using EmptyHelper = internal::lambda_wrap_empty<Return, Args...>;
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template <typename Lambda>
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using IsUnique = std_::is_same<lambda, std_::decay_simple_t<Lambda>>;
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template <typename Lambda>
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using IsWrap = std_::is_same<lambda_copy<Return(Args...)>, std_::decay_simple_t<Lambda>>;
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template <typename Lambda>
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using IsOther = std_::enable_if_t<!IsUnique<Lambda>::value && !IsWrap<Lambda>::value>;
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template <typename Lambda>
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using IsRvalue = std_::enable_if_t<std_::is_rvalue_reference<Lambda&&>::value>;
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public:
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using return_type = Return;
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lambda() : helper_(&EmptyHelper::instance) {
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}
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lambda(const lambda &other) = delete;
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lambda &operator=(const lambda &other) = delete;
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lambda(lambda &&other) : helper_(other.helper_) {
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helper_->construct_move_other(storage_, other.storage_);
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}
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lambda &operator=(lambda &&other) {
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auto temp = std_::move(other);
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helper_->destruct(storage_);
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helper_ = temp.helper_;
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helper_->construct_move_other(storage_, temp.storage_);
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return *this;
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}
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void swap(lambda &other) {
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if (this != &other) std_::swap_moveable(*this, other);
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}
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template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
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lambda(Lambda &&other) : helper_(&internal::lambda_wrap_helper_move<Lambda, Return, Args...>::instance) {
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internal::lambda_wrap_helper_move<Lambda, Return, Args...>::construct_move_lambda_method(storage_, &other);
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}
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template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
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lambda &operator=(Lambda &&other) {
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auto temp = std_::move(other);
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helper_->destruct(storage_);
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helper_ = &internal::lambda_wrap_helper_move<Lambda, Return, Args...>::instance;
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internal::lambda_wrap_helper_move<Lambda, Return, Args...>::construct_move_lambda_method(storage_, &temp);
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return *this;
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}
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inline Return operator()(Args... args) const {
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return helper_->call(storage_, std_::forward<Args>(args)...);
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}
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explicit operator bool() const {
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return (helper_ != &EmptyHelper::instance);
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}
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~lambda() {
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helper_->destruct(storage_);
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}
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protected:
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struct Private {
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};
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lambda(const BaseHelper *helper, const Private &) : helper_(helper) {
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}
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using alignment = typename BaseHelper::alignment;
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static_assert(BaseHelper::kStorageSize % sizeof(alignment) == 0, "Bad storage size.");
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alignas(typename BaseHelper::alignment) alignment storage_[BaseHelper::kStorageSize / sizeof(alignment)];
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const BaseHelper *helper_;
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};
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template <typename Return, typename ...Args>
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class lambda_copy<Return(Args...)> : public lambda<Return(Args...)> {
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using BaseHelper = internal::lambda_wrap_helper_base<Return, Args...>;
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using Parent = lambda<Return(Args...)>;
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template <typename Lambda>
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using IsOther = std_::enable_if_t<!std_::is_same<lambda_copy, std_::decay_simple_t<Lambda>>::value>;
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template <typename Lambda>
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using IsRvalue = std_::enable_if_t<std_::is_rvalue_reference<Lambda&&>::value>;
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template <typename Lambda>
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using IsNotRvalue = std_::enable_if_t<!std_::is_rvalue_reference<Lambda&&>::value>;
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public:
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lambda_copy() = default;
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lambda_copy(const lambda_copy &other) : Parent(other.helper_, typename Parent::Private()) {
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this->helper_->construct_copy_other(this->storage_, other.storage_);
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}
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lambda_copy &operator=(const lambda_copy &other) {
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auto temp = other;
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temp.swap(*this);
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return *this;
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}
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lambda_copy(lambda_copy &&other) = default;
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lambda_copy &operator=(lambda_copy &&other) = default;
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void swap(lambda_copy &other) {
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if (this != &other) std_::swap_moveable(*this, other);
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}
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lambda_copy clone() const {
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return *this;
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}
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template <typename Lambda, typename = IsOther<Lambda>>
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lambda_copy(const Lambda &other) : Parent(&internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance, typename Parent::Private()) {
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internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_copy_lambda_method(this->storage_, &other);
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}
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template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
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lambda_copy(Lambda &&other) : Parent(&internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance, typename Parent::Private()) {
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internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_move_lambda_method(this->storage_, &other);
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}
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template <typename Lambda, typename = IsOther<Lambda>>
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lambda_copy &operator=(const Lambda &other) {
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auto temp = other;
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this->helper_->destruct(this->storage_);
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this->helper_ = &internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance;
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internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_copy_lambda_method(this->storage_, &other);
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return *this;
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}
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template <typename Lambda, typename = IsOther<Lambda>, typename = IsRvalue<Lambda>>
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lambda_copy &operator=(Lambda &&other) {
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auto temp = std_::move(other);
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this->helper_->destruct(this->storage_);
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this->helper_ = &internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::instance;
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internal::lambda_wrap_helper_copy<Lambda, Return, Args...>::construct_move_lambda_method(this->storage_, &other);
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return *this;
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}
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};
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// Get lambda type from a lambda template parameter.
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namespace internal {
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template <typename FunctionType>
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struct lambda_type_helper;
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template <typename Lambda, typename R, typename ...Args>
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struct lambda_type_helper<R(Lambda::*)(Args...) const> {
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using type = lambda<R(Args...)>;
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};
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} // namespace internal
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template <typename FunctionType>
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using lambda_type = typename internal::lambda_type_helper<decltype(&FunctionType::operator())>::type;
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// Guard lambda call by one or many QObject* weak pointers.
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namespace internal {
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template <int N>
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class lambda_guard_creator;
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template <int N, typename Lambda>
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class lambda_guard_data {
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public:
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using return_type = typename lambda_type<Lambda>::return_type;
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template <typename ...PointersAndLambda>
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lambda_guard_data(PointersAndLambda&&... qobjectsAndLambda) : _lambda(init(_pointers, std_::forward<PointersAndLambda>(qobjectsAndLambda)...)) {
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}
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template <typename ...Args>
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inline return_type operator()(Args... args) const {
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for (int i = 0; i != N; ++i) {
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if (!_pointers[i]) {
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return return_type();
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}
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}
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return _lambda(std_::forward<Args>(args)...);
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}
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private:
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template <typename ...PointersAndLambda>
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Lambda init(QPointer<QObject> *pointers, QObject *qobject, PointersAndLambda&&... qobjectsAndLambda) {
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*pointers = qobject;
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return init(++pointers, std_::forward<PointersAndLambda>(qobjectsAndLambda)...);
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}
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Lambda init(QPointer<QObject> *pointers, Lambda &&lambda) {
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return std_::move(lambda);
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}
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QPointer<QObject> _pointers[N];
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Lambda _lambda;
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};
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template <int N, typename Lambda>
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class lambda_guard {
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public:
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using return_type = typename lambda_type<Lambda>::return_type;
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template <typename ...PointersAndLambda>
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lambda_guard(PointersAndLambda&&... qobjectsAndLambda) : _data(std_::make_unique<lambda_guard_data<N, Lambda>>(std_::forward<PointersAndLambda>(qobjectsAndLambda)...)) {
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static_assert(sizeof...(PointersAndLambda) == N + 1, "Wrong argument count!");
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}
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template <typename ...Args>
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inline return_type operator()(Args... args) const {
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return (*_data)(std_::forward<Args>(args)...);
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}
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private:
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std_::unique_ptr<lambda_guard_data<N, Lambda>> _data;
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};
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template <int N, int K, typename ...PointersAndLambda>
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struct lambda_guard_type;
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template <int N, int K, typename Pointer, typename ...PointersAndLambda>
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struct lambda_guard_type<N, K, Pointer, PointersAndLambda...> {
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using type = typename lambda_guard_type<N, K - 1, PointersAndLambda...>::type;
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};
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template <int N, typename Lambda>
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struct lambda_guard_type<N, 0, Lambda> {
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using type = lambda_guard<N, Lambda>;
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};
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template <typename ...PointersAndLambda>
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struct lambda_guard_type_helper {
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static constexpr int N = sizeof...(PointersAndLambda);
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using type = typename lambda_guard_type<N - 1, N - 1, PointersAndLambda...>::type;
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};
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template <typename ...PointersAndLambda>
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using lambda_guard_t = typename lambda_guard_type_helper<PointersAndLambda...>::type;
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} // namespace internal
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template <typename ...PointersAndLambda>
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inline internal::lambda_guard_t<PointersAndLambda...> lambda_guarded(PointersAndLambda&&... qobjectsAndLambda) {
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static_assert(sizeof...(PointersAndLambda) > 0, "Lambda should be passed here.");
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return internal::lambda_guard_t<PointersAndLambda...>(std_::forward<PointersAndLambda>(qobjectsAndLambda)...);
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}
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// Pass lambda instead of a Qt void() slot.
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class lambda_slot_wrap : public QObject {
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Q_OBJECT
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public:
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lambda_slot_wrap(QObject *parent, lambda<void()> &&lambda) : QObject(parent), _lambda(std_::move(lambda)) {
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}
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public slots:
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void action() {
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_lambda();
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}
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private:
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lambda<void()> _lambda;
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};
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inline lambda_slot_wrap *lambda_slot(QObject *parent, lambda<void()> &&lambda) {
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return new lambda_slot_wrap(parent, std_::move(lambda));
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}
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} // namespace base
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