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
2.2 KiB
C++
60 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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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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// <stddef.h>
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#include <stddef.h>
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#include <cassert>
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#include <type_traits>
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#ifndef NULL
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#error NULL not defined
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#endif
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#ifndef offsetof
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#error offsetof not defined
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#endif
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int main()
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{
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void *p = NULL;
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assert(!p);
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static_assert(sizeof(size_t) == sizeof(void*),
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"sizeof(size_t) == sizeof(void*)");
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static_assert(std::is_unsigned<size_t>::value,
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"std::is_unsigned<size_t>::value");
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static_assert(std::is_integral<size_t>::value,
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"std::is_integral<size_t>::value");
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static_assert(sizeof(ptrdiff_t) == sizeof(void*),
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"sizeof(ptrdiff_t) == sizeof(void*)");
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static_assert(std::is_signed<ptrdiff_t>::value,
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"std::is_signed<ptrdiff_t>::value");
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static_assert(std::is_integral<ptrdiff_t>::value,
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"std::is_integral<ptrdiff_t>::value");
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static_assert(std::is_same<decltype(nullptr), nullptr_t>::value,
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"decltype(nullptr) == nullptr_t");
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static_assert(sizeof(nullptr_t) == sizeof(void*),
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"sizeof(nullptr_t) == sizeof(void*)");
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static_assert(std::is_pod<max_align_t>::value,
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"std::is_pod<max_align_t>::value");
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static_assert((std::alignment_of<max_align_t>::value >=
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std::alignment_of<long long>::value),
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"std::alignment_of<max_align_t>::value >= "
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"std::alignment_of<long long>::value");
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static_assert(std::alignment_of<max_align_t>::value >=
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std::alignment_of<long double>::value,
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"std::alignment_of<max_align_t>::value >= "
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"std::alignment_of<long double>::value");
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static_assert(std::alignment_of<max_align_t>::value >=
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std::alignment_of<void*>::value,
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"std::alignment_of<max_align_t>::value >= "
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"std::alignment_of<void*>::value");
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}
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