Instead of defining is_reference in terms of is_lvalue_reference
and is_rvalue_reference, just define it directly.
Tested on x86_64-pc-linux-gnu, does this look OK for trunk?
This reduces memory usage of join.cc by 1%.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_reference): Make the primary
template derive from false_type. Define two partial
specializations that derive from true_type.
---
libstdc++-v3/include/std/type_traits | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/std/type_traits
b/libstdc++-v3/include/std/type_traits
index b83e7257a9f..94e73eafd2f 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -611,8 +611,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// is_reference
template<typename _Tp>
struct is_reference
- : public __or_<is_lvalue_reference<_Tp>,
- is_rvalue_reference<_Tp>>::type
+ : public false_type
+ { };
+
+ template<typename _Tp>
+ struct is_reference<_Tp&>
+ : public true_type
+ { };
+
+ template<typename _Tp>
+ struct is_reference<_Tp&&>
+ : public true_type
{ };
/// is_arithmetic
--
2.37.3.518.g79f2338b37
