templates.hpp

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#include <iterator>
#include <type_traits>
 
namespace z {
namespace core {
 
template <typename T>
using dereference = std::remove_const_t<std::remove_reference_t<decltype(*std::declval<decltype(std::declval<T>().begin())>())>>;
 
template <typename T>
using iterator_value = std::remove_const_t<decltype(std::declval<T>().begin())>;
 
template <typename T>
using const_iterator_value = decltype(std::declval<const T &>().begin());
 
template <typename T, typename = void>
struct is_iterator : std::false_type {};
 
template <typename T>
struct is_iterator<T, std::void_t<decltype(std::begin(std::declval<T>()))>> : std::true_type {};
 
} // namespace core
} // namespace z