libstdc++: Move std::hash<std::thread::id> to <bits/std_thread.h>

This makes the hash function available without including the whole of
<thread>, which is needed for <barrier>.

libstdc++-v3/ChangeLog:

	* include/bits/std_thread.h (hash<thread::id>): Move here,
	from ...
	* include/std/thread (hash<thread::id>): ... here.

diff --git a/libstdc++-v3/include/bits/std_thread.h b/libstdc++-v3/include/bits/std_thread.h
index 24bd5fbd44e8e8f1c6970a88c1242d21398c8694..4810d355695f5e7f4f5e9c0267a32a1ecc4eb8fd 100644 (file)
--- a/libstdc++-v3/include/bits/std_thread.h
+++ b/libstdc++-v3/include/bits/std_thread.h
@@ -38,6 +38,7 @@
 #include <exception>           // std::terminate
 #include <iosfwd>              // std::basic_ostream
 #include <tuple>               // std::tuple
+#include <bits/functional_hash.h> // std::hash
 #include <bits/invoke.h>       // std::__invoke
 #include <bits/refwrap.h>       // not required, but helpful to users
 #include <bits/unique_ptr.h>   // std::unique_ptr
@@ -288,6 +289,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   // N.B. other comparison operators are defined in <thread>
 
+  // DR 889.
+  /// std::hash specialization for thread::id.
+  template<>
+    struct hash<thread::id>
+    : public __hash_base<size_t, thread::id>
+    {
+      size_t
+      operator()(const thread::id& __id) const noexcept
+      { return std::_Hash_impl::hash(__id._M_thread); }
+    };
+
   namespace this_thread
   {
     /// this_thread::get_id

diff --git a/libstdc++-v3/include/std/thread b/libstdc++-v3/include/std/thread
index 8d0ede2b6c2a878d92cb3192da6bd4ec0cb06442..10fb9e631be072814384e954c293003218bc4a66 100644 (file)
--- a/libstdc++-v3/include/std/thread
+++ b/libstdc++-v3/include/std/thread
@@ -43,7 +43,6 @@
 #endif
 
 #include <bits/std_thread.h> // std::thread, get_id, yield
-#include <bits/functional_hash.h> // std::hash
 
 #ifdef _GLIBCXX_USE_NANOSLEEP
 # include <cerrno>  // errno, EINTR
@@ -94,17 +93,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   { return !(__x < __y); }
 #endif // __cpp_lib_three_way_comparison
 
-  // DR 889.
-  /// std::hash specialization for thread::id.
-  template<>
-    struct hash<thread::id>
-    : public __hash_base<size_t, thread::id>
-    {
-      size_t
-      operator()(const thread::id& __id) const noexcept
-      { return std::_Hash_impl::hash(__id._M_thread); }
-    };
-
   template<class _CharT, class _Traits>
     inline basic_ostream<_CharT, _Traits>&
     operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id)