[gcc r14-940] libstdc++: use __bool_constant instead of integral_constant

[Patrick Palka <ppalka@gcc.gnu.org>]

https://gcc.gnu.org/g:637edefc5863cf3b572c0c0bcd58fcc01ee60184

commit r14-940-g637edefc5863cf3b572c0c0bcd58fcc01ee60184
Author: Ken Matsui <kmatsui@cs.washington.edu>
Date:   Thu Mar 23 04:06:08 2023 -0700

    libstdc++: use __bool_constant instead of integral_constant
    
    In the type_traits header, both integral_constant<bool> and __bool_constant
    are used. This patch unifies those usages into __bool_constant.
    
    libstdc++-v3/ChangeLog:
    
            * include/std/type_traits: Use __bool_constant instead of
            integral_constant.
    
    Signed-off-by: Ken Matsui <kmatsui@cs.washington.edu>
    Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
    Reviewed-by: Patrick Palka <ppalka@redhat.com>

Diff:
---
 libstdc++-v3/include/std/type_traits | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 2bd607a8b8f..bc6982f9e64 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -578,19 +578,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_enum
   template<typename _Tp>
     struct is_enum
-    : public integral_constant<bool, __is_enum(_Tp)>
+    : public __bool_constant<__is_enum(_Tp)>
     { };
 
   /// is_union
   template<typename _Tp>
     struct is_union
-    : public integral_constant<bool, __is_union(_Tp)>
+    : public __bool_constant<__is_union(_Tp)>
     { };
 
   /// is_class
   template<typename _Tp>
     struct is_class
-    : public integral_constant<bool, __is_class(_Tp)>
+    : public __bool_constant<__is_class(_Tp)>
     { };
 
   /// is_function
@@ -784,7 +784,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_trivial
   template<typename _Tp>
     struct is_trivial
-    : public integral_constant<bool, __is_trivial(_Tp)>
+    : public __bool_constant<__is_trivial(_Tp)>
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
 	"template argument must be a complete class or an unbounded array");
@@ -793,7 +793,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_trivially_copyable
   template<typename _Tp>
     struct is_trivially_copyable
-    : public integral_constant<bool, __is_trivially_copyable(_Tp)>
+    : public __bool_constant<__is_trivially_copyable(_Tp)>
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
 	"template argument must be a complete class or an unbounded array");
@@ -802,7 +802,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_standard_layout
   template<typename _Tp>
     struct is_standard_layout
-    : public integral_constant<bool, __is_standard_layout(_Tp)>
+    : public __bool_constant<__is_standard_layout(_Tp)>
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
 	"template argument must be a complete class or an unbounded array");
@@ -817,7 +817,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     struct
     _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout && is_trivial")
     is_pod
-    : public integral_constant<bool, __is_pod(_Tp)>
+    : public __bool_constant<__is_pod(_Tp)>
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
 	"template argument must be a complete class or an unbounded array");
@@ -831,7 +831,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     struct
     _GLIBCXX17_DEPRECATED
     is_literal_type
-    : public integral_constant<bool, __is_literal_type(_Tp)>
+    : public __bool_constant<__is_literal_type(_Tp)>
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
 	"template argument must be a complete class or an unbounded array");
@@ -840,13 +840,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_empty
   template<typename _Tp>
     struct is_empty
-    : public integral_constant<bool, __is_empty(_Tp)>
+    : public __bool_constant<__is_empty(_Tp)>
     { };
 
   /// is_polymorphic
   template<typename _Tp>
     struct is_polymorphic
-    : public integral_constant<bool, __is_polymorphic(_Tp)>
+    : public __bool_constant<__is_polymorphic(_Tp)>
     { };
 
 #if __cplusplus >= 201402L
@@ -855,14 +855,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// @since C++14
   template<typename _Tp>
     struct is_final
-    : public integral_constant<bool, __is_final(_Tp)>
+    : public __bool_constant<__is_final(_Tp)>
     { };
 #endif
 
   /// is_abstract
   template<typename _Tp>
     struct is_abstract
-    : public integral_constant<bool, __is_abstract(_Tp)>
+    : public __bool_constant<__is_abstract(_Tp)>
     { };
 
   /// @cond undocumented
@@ -873,7 +873,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template<typename _Tp>
     struct __is_signed_helper<_Tp, true>
-    : public integral_constant<bool, _Tp(-1) < _Tp(0)>
+    : public __bool_constant<_Tp(-1) < _Tp(0)>
     { };
   /// @endcond
 
@@ -1333,7 +1333,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// has_virtual_destructor
   template<typename _Tp>
     struct has_virtual_destructor
-    : public integral_constant<bool, __has_virtual_destructor(_Tp)>
+    : public __bool_constant<__has_virtual_destructor(_Tp)>
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
 	"template argument must be a complete class or an unbounded array");
@@ -1392,7 +1392,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp, typename _Up>
     struct is_same
 #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME
-    : public integral_constant<bool, __is_same(_Tp, _Up)>
+    : public __bool_constant<__is_same(_Tp, _Up)>
 #else
     : public false_type
 #endif
@@ -1408,7 +1408,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   /// is_base_of
   template<typename _Base, typename _Derived>
     struct is_base_of
-    : public integral_constant<bool, __is_base_of(_Base, _Derived)>
+    : public __bool_constant<__is_base_of(_Base, _Derived)>
     { };
 
 #if __has_builtin(__is_convertible)