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feat: add meta funcs, has_reserve/push_back_method

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This commit is contained in:
ToruNiina 2020-03-27 18:01:47 +09:00
parent 31826b55ce
commit fcd6e47500
1 changed files with 14 additions and 6 deletions
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20
toml/traits.hpp
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@ -43,17 +43,23 @@ struct has_mapped_type_impl
template<typename T> static std::true_type check(typename T::mapped_type*);
template<typename T> static std::false_type check(...);
};
struct has_resize_method_impl
struct has_reserve_method_impl
{
constexpr static std::size_t dummy=0;
template<typename T> static std::true_type check(decltype(std::declval<T>().resize(dummy))*);
template<typename T> static std::false_type check(...);
template<typename T> static std::true_type check(
decltype(std::declval<T>().reserve(std::declval<std::size_t>()))*);
};
struct has_push_back_method_impl
{
template<typename T> static std::false_type check(...);
template<typename T> static std::true_type check(
decltype(std::declval<T>().push_back(std::declval<typename T::value_type>()))*);
};
struct is_comparable_impl
{
template<typename T> static std::true_type check(decltype(std::declval<T>() < std::declval<T>())*);
template<typename T> static std::false_type check(...);
template<typename T> static std::true_type check(
decltype(std::declval<T>() < std::declval<T>())*);
};
struct has_from_toml_method_impl
@ -91,7 +97,9 @@ struct has_key_type : decltype(has_key_type_impl::check<T>(nullptr)){};
template<typename T>
struct has_mapped_type : decltype(has_mapped_type_impl::check<T>(nullptr)){};
template<typename T>
struct has_resize_method : decltype(has_resize_method_impl::check<T>(nullptr)){};
struct has_reserve_method : decltype(has_reserve_method_impl::check<T>(nullptr)){};
template<typename T>
struct has_push_back_method : decltype(has_push_back_method_impl::check<T>(nullptr)){};
template<typename T>
struct is_comparable : decltype(is_comparable_impl::check<T>(nullptr)){};