TypeTraits.hpp

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#pragma once
 
#include <Settings/NamespaceSettings.hpp>
 
#include <AH/STL/type_traits>
#include <AH/STL/utility>
 
BEGIN_CS_NAMESPACE
 
template <class...>
using void_t = void;
 
template <class, class = void>
struct has_method_begin : std::false_type {};
 
template <class T>
struct has_method_begin<T, void_t<decltype(std::declval<T>().begin())>>
    : std::true_type {};
struct has_method_begin<T, void_t<decltype(std::declval<T>().begin())>> {…};
 
template <class T>
typename std::enable_if<has_method_begin<T>::value>::type
begin_if_possible(T &t) {
    t.begin();
}
begin_if_possible(T &t) {…}
 
template <class T>
typename std::enable_if<!has_method_begin<T>::value>::type
begin_if_possible(T &) {}
 
END_CS_NAMESPACE