clang/lib/Headers/__stddef_nullptr_t.h

   1 /*===---- __stddef_nullptr_t.h - Definition of nullptr_t -------------------===
   2  *
   3  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4  * See https://llvm.org/LICENSE.txt for license information.
   5  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6  *
   7  *===-----------------------------------------------------------------------===
   8  */
   9
  10 /*
  11  * When -fbuiltin-headers-in-system-modules is set this is a non-modular header
  12  * and needs to behave as if it was textual.
  13  */
  14 #if !defined(_NULLPTR_T) ||                                                    \
  15     (__has_feature(modules) && !__building_module(_Builtin_stddef))
  16 #define _NULLPTR_T
  17
  18 #ifdef __cplusplus
  19 #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
  20 namespace std {
  21 typedef decltype(nullptr) nullptr_t;
  22 }
  23 using ::std::nullptr_t;
  24 #endif
  25 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
  26 typedef typeof(nullptr) nullptr_t;
  27 #endif
  28
  29 #endif