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https://github.com/ToruNiina/toml11.git
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55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
#ifndef TOML11_TRAITS
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#define TOML11_TRAITS
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#include <type_traits>
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namespace toml
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{
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namespace detail
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{
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template<typename T>
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using unwrap_t = typename std::decay<T>::type;
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struct has_iterator_impl
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{
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template<typename T> static std::true_type check(typename T::iterator*);
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template<typename T> static std::false_type check(...);
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};
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struct has_value_type_impl
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{
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template<typename T> static std::true_type check(typename T::value_type*);
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template<typename T> static std::false_type check(...);
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};
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struct has_key_type_impl
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{
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template<typename T> static std::true_type check(typename T::key_type*);
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template<typename T> static std::false_type check(...);
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};
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struct has_mapped_type_impl
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{
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template<typename T> static std::true_type check(typename T::mapped_type*);
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template<typename T> static std::false_type check(...);
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};
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template<typename T>
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struct has_iterator : decltype(has_iterator_impl::check<T>(nullptr)){};
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template<typename T>
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struct has_value_type : decltype(has_value_type_impl::check<T>(nullptr)){};
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template<typename T>
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struct has_key_type : decltype(has_key_type_impl::check<T>(nullptr)){};
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template<typename T>
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struct has_mapped_type : decltype(has_mapped_type_impl::check<T>(nullptr)){};
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template<typename T>
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struct is_container : std::integral_constant<bool,
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has_iterator<T>::value && has_value_type<T>::value>{};
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template<typename T>
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struct is_map : std::integral_constant<bool,
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has_iterator<T>::value && has_key_type<T>::value &&
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has_mapped_type<T>::value>{};
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}// detail
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}//toml
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#endif // TOML_TRAITS
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