is_printable.hpp

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# /*
#  * Created by YongGyu Lee on 2020/12/08.
#  */
#
# ifndef VCCC_TYPE_TRAITS_IS_PRINTABLE_HPP
# define VCCC_TYPE_TRAITS_IS_PRINTABLE_HPP
#
# include <ostream>
# include <type_traits>
#
# include "vccc/__type_traits/void_t.hpp"
 
namespace vccc {
 
template<typename T, typename = void>
struct is_printable : std::false_type {};
 
template<typename T>
struct is_printable<T, void_t<
    decltype(std::declval<std::ostream&>() << std::declval<const T&>())
>> : std::true_type {};
 
 
} // namespace vccc
 
# endif // VCCC_TYPE_TRAITS_IS_PRINTABLE_HPP