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move return_type_of_t from result to traits

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ToruNiina
2019-02-13 13:34:03 +09:00
parent 8c3854b28b
commit 32dcc35918
2 changed files with 46 additions and 32 deletions
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28
toml/traits.hpp
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@@ -15,6 +15,9 @@ namespace detail
template<typename T>
using unwrap_t = typename std::decay<T>::type;
// ---------------------------------------------------------------------------
// check whether type T is a kind of container/map class
struct has_iterator_impl
{
template<typename T> static std::true_type check(typename T::iterator*);
@@ -63,6 +66,9 @@ struct has_resize_method : decltype(has_resize_method_impl::check<T>(nullptr)){}
#undef decltype(...)
#endif
// ---------------------------------------------------------------------------
// C++17 and/or/not
template<typename ...> struct conjunction : std::true_type{};
template<typename T> struct conjunction<T> : T{};
template<typename T, typename ... Ts>
@@ -80,6 +86,9 @@ struct disjunction<T, Ts...> :
template<typename T>
struct negation : std::integral_constant<bool, !static_cast<bool>(T::value)>{};
// ---------------------------------------------------------------------------
// normal type checker
template<typename T> struct is_std_pair : std::false_type{};
template<typename T1, typename T2>
struct is_std_pair<std::pair<T1, T2>> : std::true_type{};
@@ -92,7 +101,9 @@ template<typename T> struct is_chrono_duration: std::false_type{};
template<typename Rep, typename Period>
struct is_chrono_duration<std::chrono::duration<Rep, Period>>: std::true_type{};
// to use toml::get<std::tuple<T1, T2, ...>> in C++11
// ---------------------------------------------------------------------------
// C++14 index_sequence
template<std::size_t ... Ns> struct index_sequence{};
template<typename IS, std::size_t N> struct push_back_index_sequence{};
@@ -116,6 +127,21 @@ struct index_sequence_maker<0>
template<std::size_t N>
using make_index_sequence = typename index_sequence_maker<N-1>::type;
// ---------------------------------------------------------------------------
// return_type_of_t
#if __cplusplus >= 201703L
template<typename F, typename ... Args>
using return_type_of_t = std::invoke_result_t<F, Args...>;
#else
// result_of is deprecated after C++17
template<typename F, typename ... Args>
using return_type_of_t = typename std::result_of<F(Args...)>::type;
#endif
}// detail
}//toml
#endif // TOML_TRAITS