368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___FORMAT_FORMAT_ARGS_H
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#define _LIBCPP___FORMAT_FORMAT_ARGS_H
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#include <__availability>
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#include <__config>
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#include <__format/format_fwd.h>
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#include <cstddef>
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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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#if _LIBCPP_STD_VER > 17
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// TODO FMT Remove this once we require compilers with proper C++20 support.
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// If the compiler has no concepts support, the format header will be disabled.
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// Without concepts support enable_if needs to be used and that too much effort
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// to support compilers with partial C++20 support.
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#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
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template <class _Context>
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class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_args {
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public:
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// TODO FMT Implement [format.args]/5
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// [Note 1: Implementations are encouraged to optimize the representation of
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// basic_format_args for small number of formatting arguments by storing
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// indices of type alternatives separately from values and packing the
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// former. - end note]
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// Note: Change __format_arg_store to use a built-in array.
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_LIBCPP_HIDE_FROM_ABI basic_format_args() noexcept = default;
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template <class... _Args>
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_LIBCPP_HIDE_FROM_ABI basic_format_args(
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const __format_arg_store<_Context, _Args...>& __store) noexcept
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: __size_(sizeof...(_Args)), __data_(__store.__args.data()) {}
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_LIBCPP_HIDE_FROM_ABI
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basic_format_arg<_Context> get(size_t __id) const noexcept {
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return __id < __size_ ? __data_[__id] : basic_format_arg<_Context>{};
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}
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_LIBCPP_HIDE_FROM_ABI size_t __size() const noexcept { return __size_; }
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private:
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size_t __size_{0};
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const basic_format_arg<_Context>* __data_{nullptr};
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};
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#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
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#endif //_LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FORMAT_FORMAT_ARGS_H
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