80 lines
2.4 KiB
C++
80 lines
2.4 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_arg.h>
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#include <__format/format_arg_store.h>
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#include <__format/format_fwd.h>
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#include <cstddef>
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#include <cstdint>
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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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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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_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(const __format_arg_store<_Context, _Args...>& __store) noexcept
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: __size_(sizeof...(_Args)) {
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if constexpr (sizeof...(_Args) != 0) {
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if constexpr (__format::__use_packed_format_arg_store(sizeof...(_Args))) {
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__values_ = __store.__storage.__values_;
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__types_ = __store.__storage.__types_;
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} else
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__args_ = __store.__storage.__args_;
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}
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}
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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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if (__id >= __size_)
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return basic_format_arg<_Context>{};
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if (__format::__use_packed_format_arg_store(__size_))
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return basic_format_arg<_Context>{__format::__get_packed_type(__types_, __id), __values_[__id]};
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return __args_[__id];
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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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// [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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union {
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struct {
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const __basic_format_arg_value<_Context>* __values_;
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uint64_t __types_;
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};
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const basic_format_arg<_Context>* __args_;
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};
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};
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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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