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Fix build for Xcode.

This commit is contained in:
John Preston 2019-07-05 17:08:33 +02:00
parent f19ff1f9b2
commit 96a26b44a9
1 changed files with 15 additions and 2 deletions
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17
Telegram/SourceFiles/mtproto/core_types.h
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@ -376,6 +376,15 @@ struct RepeatHelper {
template <typename Type>
using Repeat = typename RepeatHelper<Type>::type;
struct InnerHelper {
static void Check(...);
template <typename Type, typename Result = decltype(std::declval<Type>().v)>
static Result Check(const Type&);
template <typename Type>
using type = std::decay_t<decltype(Check(std::declval<Type>()))>;
};
template <typename Type>
class conditional {
public:
@ -397,12 +406,16 @@ public:
return *_value;
}
template <typename Inner = std::decay_t<decltype(std::declval<Type>().v)>>
template <
typename Inner = InnerHelper::type<Type>,
typename = std::enable_if_t<!std::is_same_v<Inner, void>>>
Inner value_or(Repeat<Inner> fallback) const {
return _value ? _value->v : fallback;
}
template <typename Inner = std::decay_t<decltype(std::declval<Type>().v)>>
template <
typename Inner = InnerHelper::type<Type>,
typename = std::enable_if_t<!std::is_same_v<Inner, void>>>
Inner value_or_empty() const {
return _value ? _value->v : Inner();
}