96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include <QtCore/QLatin1String>
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namespace base {
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template <typename Type>
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inline Type take(Type &value) {
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return std::exchange(value, Type {});
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}
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template <typename Type>
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inline Type duplicate(const Type &value) {
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return value;
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}
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template <typename Type, size_t Size>
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inline constexpr size_t array_size(const Type(&)[Size]) {
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return Size;
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}
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template <typename Container, typename T>
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inline bool contains(const Container &container, const T &value) {
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const auto end = std::end(container);
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return std::find(std::begin(container), end, value) != end;
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}
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template <typename D, typename T>
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inline constexpr D up_cast(T object) {
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using DV = std::decay_t<decltype(*D())>;
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using TV = std::decay_t<decltype(*T())>;
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if constexpr (std::is_base_of_v<DV, TV>) {
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return object;
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} else {
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return nullptr;
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}
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}
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// We need a custom comparator for set<std::unique_ptr<T>>::find to work with pointers.
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// thanks to http://stackoverflow.com/questions/18939882/raw-pointer-lookup-for-sets-of-unique-ptrs
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template <typename T>
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struct pointer_comparator {
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using is_transparent = std::true_type;
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// helper does some magic in order to reduce the number of
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// pairs of types we need to know how to compare: it turns
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// everything into a pointer, and then uses `std::less<T*>`
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// to do the comparison:
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struct helper {
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const T *ptr = nullptr;
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helper() = default;
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helper(const helper &other) = default;
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helper(const T *p) : ptr(p) {
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}
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template <typename ...Ts>
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helper(const std::shared_ptr<Ts...> &other) : ptr(other.get()) {
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}
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template <typename ...Ts>
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helper(const std::unique_ptr<Ts...> &other) : ptr(other.get()) {
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}
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bool operator<(helper other) const {
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return std::less<const T*>()(ptr, other.ptr);
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}
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};
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// without helper, we'd need 2^n different overloads, where
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// n is the number of types we want to support (so, 8 with
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// raw pointers, unique pointers, and shared pointers). That
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// seems silly.
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// && helps enforce rvalue use only
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bool operator()(const helper &&lhs, const helper &&rhs) const {
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return lhs < rhs;
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}
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};
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} // namespace base
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template <typename T>
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inline void accumulate_max(T &a, const T &b) { if (a < b) a = b; }
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template <typename T>
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inline void accumulate_min(T &a, const T &b) { if (a > b) a = b; }
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template <size_t Size>
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QLatin1String qstr(const char(&string)[Size]) {
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return QLatin1String(string, Size - 1);
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}
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