type_traits.hpp

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#pragma once
 
#include <iterator>
#include <type_traits>
 
namespace bricks {
 
namespace detail {
 
template <typename T, typename U, typename = void>
struct has_find : std::false_type {
};
 
template <typename T, typename U>
struct has_find<T, U, std::void_t<decltype(std::declval<T>().find(std::declval<U>()))>>
    : std::true_type {
};
 
template <typename T, typename = void>
struct is_iterator : std::false_type {
};
 
template <typename T>
struct is_iterator<T, std::void_t<typename std::iterator_traits<T>::iterator_category>>
    : std::true_type {
};
 
}  // namespace detail
 
template <class>
inline constexpr bool always_false_v = false;
 
template <typename T, typename U>
struct has_find : detail::has_find<T, U>::type {
};
 
template <class T, typename U>
inline constexpr bool has_find_v = has_find<T, U>::value;
 
template <typename T>
struct is_iterator : detail::is_iterator<T>::type {
};
 
template <typename T>
inline constexpr bool is_iterator_v = is_iterator<T>::value;
 
}  // namespace bricks