From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 27 Jun 2018 10:30:52 +0000 (+0100)
Subject: Add std::__is_byte<std::byte> specialization
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cd7ec27c3f4a90508b57111c9d7d0907b3e03dc4;p=gcc.git

Add std::__is_byte<std::byte> specialization

	* include/bits/cpp_type_traits.h [__cplusplus >= 201703]
	(__is_byte<byte>): Define specialization for std::byte.

From-SVN: r262182
---

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 0db12be6f8b..97a8076576c 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,8 @@
 2018-06-27  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/cpp_type_traits.h [__cplusplus >= 201703]
+	(__is_byte<byte>): Define specialization for std::byte.
+
 	PR libstdc++/86138
 	* include/bits/basic_string.tcc: [_GLIBCXX_EXTERN_TEMPLATE < 0]
 	Declare explicit instantiations of COW empty reps and I/O functions.
diff --git a/libstdc++-v3/include/bits/cpp_type_traits.h b/libstdc++-v3/include/bits/cpp_type_traits.h
index ed6de4696c7..960d469f412 100644
--- a/libstdc++-v3/include/bits/cpp_type_traits.h
+++ b/libstdc++-v3/include/bits/cpp_type_traits.h
@@ -391,6 +391,17 @@ __INT_N(__GLIBCXX_TYPE_INT_N_3)
       typedef __true_type __type;
     };
 
+#if __cplusplus >= 201703L
+  enum class byte : unsigned char;
+
+  template<>
+    struct __is_byte<byte>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+#endif // C++17
+
   //
   // Move iterator type
   //