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Use 'if constexpr ()' instead of tag dispatch.

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This commit is contained in:
John Preston
2017-09-29 13:55:25 +03:00
parent 5cc7cb1d85
commit ea0f6b9a12
5 changed files with 78 additions and 176 deletions
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19
Telegram/SourceFiles/core/utils.h
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@@ -43,25 +43,16 @@ inline span<const char> make_span(const QByteArray &cont) {
#endif // OS_MAC_OLD
namespace base {
namespace internal {
template <typename D, typename T>
inline constexpr D up_cast_helper(std::true_type, T object) {
return object;
}
template <typename D, typename T>
inline constexpr D up_cast_helper(std::false_type, T object) {
return nullptr;
}
} // namespace internal
template <typename D, typename T>
inline constexpr D up_cast(T object) {
using DV = std::decay_t<decltype(*D())>;
using TV = std::decay_t<decltype(*T())>;
return internal::up_cast_helper<D>(std::integral_constant<bool, std::is_base_of<DV, TV>::value || std::is_same<DV, TV>::value>(), object);
if constexpr (std::is_base_of_v<DV, TV>) {
return object;
} else {
return nullptr;
}
}
template <typename Container, typename T>