759cd0e86b
There are a bunch of macros (__need_size_t etc) that request just one piece of <stddef.h>; if any one of these is defined, we just directly include the underlying header. Note that <stddef.h> provides a ::nullptr_t. We don't want that available to includers of <cstddef>, so instead of following the usual pattern where <cfoo> includes <foo.h> then pulls things from :: into std:: with using-declarations, we implement <stddef.h> and <cstddef> separately; both include <__nullptr> for the definition of std::nullptr_t. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@249761 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
1.1 KiB
C++
60 lines
1.1 KiB
C++
// -*- C++ -*-
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//===--------------------------- cstddef ----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_CSTDDEF
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#define _LIBCPP_CSTDDEF
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/*
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cstddef synopsis
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Macros:
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offsetof(type,member-designator)
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NULL
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namespace std
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{
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Types:
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ptrdiff_t
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size_t
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max_align_t
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nullptr_t
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} // std
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*/
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#include <__config>
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// Don't include our own <stddef.h>; we don't want to declare ::nullptr_t.
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#include_next <stddef.h>
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#include <__nullptr>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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using ::ptrdiff_t;
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using ::size_t;
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#if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T)
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// Re-use the compiler's <stddef.h> max_align_t where possible.
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using ::max_align_t;
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#else
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typedef long double max_align_t;
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_CSTDDEF
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