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Fix another g++-4.9 CE.

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GitOrigin-RevId: a33df8605db518fb5dfea2f542094af6977c2053
This commit is contained in:
levlam 2019-02-13 02:45:08 +03:00
parent 8c3eb953ae
commit a9ded5b498
1 changed files with 9 additions and 2 deletions
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11
tdutils/td/utils/as.h
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@ -64,14 +64,21 @@ class ConstAs {
} // namespace detail
// no std::is_trivially_copyable in libstdc++ before 5.0
#if __GLIBCXX__
#define TD_IS_TRIVIALLY_COPYABLE(T) __has_trivial_copy(T)
#else
#define TD_IS_TRIVIALLY_COPYABLE(T) std::is_trivially_copyable<T>::value
#endif
template <class ToT, class FromT,
std::enable_if_t<std::is_trivially_copyable<ToT>::value && std::is_trivially_copyable<FromT>::value, int> = 0>
std::enable_if_t<TD_IS_TRIVIALLY_COPYABLE(ToT) && TD_IS_TRIVIALLY_COPYABLE(FromT), int> = 0>
detail::As<ToT> as(FromT *from) {
return detail::As<ToT>(from);
}
template <class ToT, class FromT,
std::enable_if_t<std::is_trivially_copyable<ToT>::value && std::is_trivially_copyable<FromT>::value, int> = 0>
std::enable_if_t<TD_IS_TRIVIALLY_COPYABLE(ToT) && TD_IS_TRIVIALLY_COPYABLE(FromT), int> = 0>
const detail::ConstAs<ToT> as(const FromT *from) {
return detail::ConstAs<ToT>(from);
}