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Add key value pair trait

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Rapptz 2014-05-31 21:10:42 -04:00
parent 5c8f661447
commit eedb2a1796
1 changed files with 14 additions and 0 deletions
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14
sol/traits.hpp
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@ -170,6 +170,20 @@ struct has_begin_end_impl {
template<typename T>
struct has_begin_end : decltype(has_begin_end_impl::test<T>(0)) {};
struct has_key_value_pair_impl {
template<typename T, typename U = Unqualified<T>,
typename V = typename U::value_type,
typename F = decltype(std::declval<V&>().first),
typename S = decltype(std::declval<V&>().second)>
static std::true_type test(int);
template<typename...>
static std::false_type test(...);
};
template<typename T>
struct has_key_value_pair : decltype(has_key_value_pair_impl::test<T>(0)) {};
} // sol
#endif // SOL_TRAITS_HPP