From 0228a6249733462c4b52ab7418307c6aafb07f4f Mon Sep 17 00:00:00 2001
From: neargye <neargye@gmail.com>
Date: Sat, 15 Aug 2020 20:30:35 +0500
Subject: [PATCH] wip

---
 include/magic_enum.hpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/magic_enum.hpp b/include/magic_enum.hpp
index 5698dff..877c438 100644
--- a/include/magic_enum.hpp
+++ b/include/magic_enum.hpp
@@ -932,6 +932,17 @@ template <typename E>
   return enum_contains<D>(static_cast<U>(value));
 }
 
+// Checks whether enum-flags contains enumerator with such string name.
+template <typename E, typename BinaryPredicate>
+[[nodiscard]] constexpr auto enum_contains(std::string_view value, BinaryPredicate p) noexcept(std::is_nothrow_invocable_r_v<bool, BinaryPredicate, char, char>) -> detail::enable_if_enum_flags_t<E, bool> {
+  using D = std::decay_t<E>;
+  static_assert(std::is_invocable_r_v<bool, BinaryPredicate, char, char>, "magic_enum::flags::enum_contains requires bool(char, char) invocable predicate.");
+  // TODO: impl
+  static_assert(sizeof(decltype(value)) == sizeof(E) * 0, "not implemented");
+  return {};
+}
+
+
 // Checks whether enum-flags contains enumerator with such string name.
 template <typename E>
 [[nodiscard]] constexpr auto enum_contains(std::string_view value) noexcept -> detail::enable_if_enum_flags_t<E, bool> {