commit c25d158c62f7485c7c3d72aa98bc519e8630c03b
author Howard Hinnant <hhinnant@apple.com> Mon Sep 24 23:36:40 2012 +0000
committer Howard Hinnant <hhinnant@apple.com> Mon Sep 24 23:36:40 2012 +0000
tree 8d67700bd193f42dc70c37ea7b3cfea3ae8354ba
parent c004e2e7d7566902569951e77adad18cf8815cf2

Apply the emulated nullptr_t with constexpr.  This is an unusual configuration that would take advantage of this.  But it has popped up in the wild and does no harm to support it.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@164575 91177308-0d34-0410-b5e6-96231b3b80d8

include/cstddef

diff --git a/include/cstddef b/include/cstddef
index 4a6b16e..4b01be2 100644
--- a/include/cstddef
+++ b/include/cstddef
@@ -62,28 +62,28 @@
 
     struct __nat {int __for_bool_;};
 
-    _LIBCPP_ALWAYS_INLINE nullptr_t() {}
-    _LIBCPP_ALWAYS_INLINE nullptr_t(int __nat::*) {}
+    _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t() : _(0) {}
+    _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t(int __nat::*) : _(0) {}
 
-    _LIBCPP_ALWAYS_INLINE operator int __nat::*() const {return 0;}
+    _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR operator int __nat::*() const {return 0;}
 
     template <class _Tp>
-        _LIBCPP_ALWAYS_INLINE
+        _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR
         operator _Tp* () const {return 0;}
 
     template <class _Tp, class _Up>
         _LIBCPP_ALWAYS_INLINE
         operator _Tp _Up::* () const {return 0;}
 
-    friend _LIBCPP_ALWAYS_INLINE bool operator==(nullptr_t, nullptr_t) {return true;}
-    friend _LIBCPP_ALWAYS_INLINE bool operator!=(nullptr_t, nullptr_t) {return false;}
-    friend _LIBCPP_ALWAYS_INLINE bool operator<(nullptr_t, nullptr_t) {return false;}
-    friend _LIBCPP_ALWAYS_INLINE bool operator<=(nullptr_t, nullptr_t) {return true;}
-    friend _LIBCPP_ALWAYS_INLINE bool operator>(nullptr_t, nullptr_t) {return false;}
-    friend _LIBCPP_ALWAYS_INLINE bool operator>=(nullptr_t, nullptr_t) {return true;}
+    friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator==(nullptr_t, nullptr_t) {return true;}
+    friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator!=(nullptr_t, nullptr_t) {return false;}
+    friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator<(nullptr_t, nullptr_t) {return false;}
+    friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator<=(nullptr_t, nullptr_t) {return true;}
+    friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator>(nullptr_t, nullptr_t) {return false;}
+    friend _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR bool operator>=(nullptr_t, nullptr_t) {return true;}
 };
 
-inline _LIBCPP_ALWAYS_INLINE nullptr_t __get_nullptr_t() {return nullptr_t(0);}
+inline _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR nullptr_t __get_nullptr_t() {return nullptr_t(0);}
 
 #define nullptr _VSTD::__get_nullptr_t()