is_stream_insertable.hpp

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#pragma once
#include <type_traits>
#include <ostream>

namespace xtd {
  template<class value_t, class = void>
  struct is_stream_insertable : std::false_type {};
  template<class value_t>
struct is_stream_insertable < value_t, std::void_t < decltype(std::declval<std::ostream&>() << std::declval<const std::remove_cvref_t<value_t>&>()) >> : std::true_type {};
  template<class value_t>
  requires std::is_enum_v<std::remove_cvref_t<value_t>>
  struct is_stream_insertable<value_t> : std::false_type {};
  
  template<class value_t>
  inline constexpr bool is_stream_insertable_v = is_stream_insertable<std::remove_cvref_t<value_t>>::value;
}