traits.h

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#ifndef FCPP_TRAITS_H
#define FCPP_TRAITS_H
 
#include <iterator>
#include <type_traits>
 
namespace fcpp::traits {
 
template <typename T, typename = void>
struct is_additive : std::false_type {};
 
template <typename T>
struct is_additive<
    T, typename std::enable_if<
           true,
           decltype(std::declval<T &>() + std::declval<T &>(), (void)0)>::type>
    : std::true_type {};
 
template <typename T, typename = void>
struct is_equality_comparable : std::false_type {};
 
template <typename T>
struct is_equality_comparable<
    T, typename std::enable_if<
           true,
           decltype(std::declval<T &>() == std::declval<T &>(), (void)0)>::type>
    : std::true_type {};
 
template <typename T, typename = void>
struct is_less_than_comparable : std::false_type {};
 
template <typename T>
struct is_less_than_comparable<
    T, typename std::enable_if<
           true,
           decltype(std::declval<T &>() < std::declval<T &>(), (void)0)>::type>
    : std::true_type {};
 
} // namespace fcpp::traits
 
#endif // FCPP_TRAITS_H