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llvm-project/libcxx/include/stddef.h

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Split <stddef.h> out of <cstddef>. 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. llvm-svn: 249761
2015-10-08 22:25:27 +00:00
// -*- C++ -*-
[runtimes][NFC] Remove filenames at the top of the license notice We've stopped doing it in libc++ for a while now because these names would end up rotting as we move things around and copy/paste stuff. This cleans up all the existing files so as to stop the spreading as people copy-paste headers around.
2021-11-17 16:25:01 -05:00
//===----------------------------------------------------------------------===//
Split <stddef.h> out of <cstddef>. 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. llvm-svn: 249761
2015-10-08 22:25:27 +00:00
//
Update more file headers across all of the LLVM projects in the monorepo to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
2019-01-19 10:56:40 +00:00
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
Split <stddef.h> out of <cstddef>. 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. llvm-svn: 249761
2015-10-08 22:25:27 +00:00
//
//===----------------------------------------------------------------------===//
/*
stddef.h synopsis
Macros:
offsetof(type,member-designator)
NULL
Types:
ptrdiff_t
size_t
Avoid using std::max_align_t in pre-C++11 mode Always depend on the compiler to have a correct implementation of max_align_t in stddef.h and don't provide a fallback. For pre-C++11, require __STDCPP_NEW_ALIGNMENT__ in <new> as provided by clang in all standard modes. Adjust test cases to avoid testing or using max_align_t in pre-C++11 mode and also to better deal with alignof(max_align_t)>16. Document requirements of the alignment tests around natural alignment of power-of-two-sized types. Differential revision: https://reviews.llvm.org/D73245
2020-04-04 00:48:02 +02:00
max_align_t // C++11
Split <stddef.h> out of <cstddef>. 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. llvm-svn: 249761
2015-10-08 22:25:27 +00:00
nullptr_t
*/
[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002) This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
2024-12-21 13:01:48 +01:00
#if defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
# include <__cxx03/stddef.h>
#else
[libc++] Add #if 0 block to all the top-level headers (#119234) Including The frozen C++03 headers results in a lot of formatting changes in the main headers, so this splits these changes into a separate commit instead. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
2024-12-10 16:02:12 +01:00
# include <__config>
[libc++] Simplify the implementation of <stddef.h> (#86843) Libc++'s own <stddef.h> is complicated by the need to handle various platform-specific macros and to support duplicate inclusion. In reality, we only need to add a declaration of nullptr_t to it, so we can simply include the underlying <stddef.h> outside of our guards to let it handle re-inclusion itself.
2024-04-02 08:14:04 -04:00
[libc++] Add #if 0 block to all the top-level headers (#119234) Including The frozen C++03 headers results in a lot of formatting changes in the main headers, so this splits these changes into a separate commit instead. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
2024-12-10 16:02:12 +01:00
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# endif
[libc++] Fix -Wgnu-include-next in stddef.h (#88214) As reported in #86843, we must have #pragma GCC system_header before we use #include_next, otherwise the compiler may not understand that we're in a system header and may issue a diagnostic for our usage of
2024-04-11 12:36:56 -04:00
[libc++] Simplify the implementation of <stddef.h> (#86843) Libc++'s own <stddef.h> is complicated by the need to handle various platform-specific macros and to support duplicate inclusion. In reality, we only need to add a declaration of nullptr_t to it, so we can simply include the underlying <stddef.h> outside of our guards to let it handle re-inclusion itself.
2024-04-02 08:14:04 -04:00
// Note: This include is outside of header guards because we sometimes get included multiple times
// with different defines and the underlying <stddef.h> will know how to deal with that.
[libc++] Add #if 0 block to all the top-level headers (#119234) Including The frozen C++03 headers results in a lot of formatting changes in the main headers, so this splits these changes into a separate commit instead. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
2024-12-10 16:02:12 +01:00
# include_next <stddef.h>
[libc++] Simplify the implementation of <stddef.h> (#86843) Libc++'s own <stddef.h> is complicated by the need to handle various platform-specific macros and to support duplicate inclusion. In reality, we only need to add a declaration of nullptr_t to it, so we can simply include the underlying <stddef.h> outside of our guards to let it handle re-inclusion itself.
2024-04-02 08:14:04 -04:00
[libc++] Add #if 0 block to all the top-level headers (#119234) Including The frozen C++03 headers results in a lot of formatting changes in the main headers, so this splits these changes into a separate commit instead. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
2024-12-10 16:02:12 +01:00
# ifndef _LIBCPP_STDDEF_H
# define _LIBCPP_STDDEF_H
Split <stddef.h> out of <cstddef>. 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. llvm-svn: 249761
2015-10-08 22:25:27 +00:00
[libc++] Add #if 0 block to all the top-level headers (#119234) Including The frozen C++03 headers results in a lot of formatting changes in the main headers, so this splits these changes into a separate commit instead. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
2024-12-10 16:02:12 +01:00
# ifdef __cplusplus
[libc++] Remove the ability to use the std::nullptr_t emulation in C++03 mode Back in https://reviews.llvm.org/D109459, we stopped using the C++03 emulation for std::nullptr_t by default, which was an ABI break. We still left a knob for users to turn it back on if they were broken by the change, with a note that we would remove that knob after one release. The time has now come to remove the knob and clean up the std::nullptr_t emulation. Differential Revision: https://reviews.llvm.org/D114786
2021-09-08 12:57:58 -04:00
typedef decltype(nullptr) nullptr_t;
[libc++] Add #if 0 block to all the top-level headers (#119234) Including The frozen C++03 headers results in a lot of formatting changes in the main headers, so this splits these changes into a separate commit instead. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
2024-12-10 16:02:12 +01:00
# endif
[libc++][C++03] Use `__cxx03/` headers in C++03 mode (#109002) This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
2024-12-21 13:01:48 +01:00
# endif // defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
Split <stddef.h> out of <cstddef>. 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. llvm-svn: 249761
2015-10-08 22:25:27 +00:00
[libc++] NFC: Normalize `#endif //` comment indentation
2021-04-20 12:03:32 -04:00
#endif // _LIBCPP_STDDEF_H
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