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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___FORMAT_FORMAT_ARGS_H |
| 11 | #define _LIBCPP___FORMAT_FORMAT_ARGS_H |
| 12 | |
| 13 | #include <__config> |
| 14 | #include <__cstddef/size_t.h> |
| 15 | #include <__format/format_arg.h> |
| 16 | #include <__format/format_arg_store.h> |
| 17 | #include <__fwd/format.h> |
| 18 | #include <cstdint> |
| 19 | |
| 20 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 21 | # pragma GCC system_header |
| 22 | #endif |
| 23 | |
| 24 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 25 | |
| 26 | #if _LIBCPP_STD_VER >= 20 |
| 27 | |
| 28 | template <class _Context> |
| 29 | class basic_format_args { |
| 30 | public: |
| 31 | template <class... _Args> |
| 32 | _LIBCPP_HIDE_FROM_ABI basic_format_args(const __format_arg_store<_Context, _Args...>& __store) noexcept |
| 33 | : __size_(sizeof...(_Args)) { |
| 34 | if constexpr (sizeof...(_Args) != 0) { |
| 35 | if constexpr (__format::__use_packed_format_arg_store(sizeof...(_Args))) { |
| 36 | __values_ = __store.__storage.__values_; |
| 37 | __types_ = __store.__storage.__types_; |
| 38 | } else |
| 39 | __args_ = __store.__storage.__args_; |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | _LIBCPP_HIDE_FROM_ABI basic_format_arg<_Context> get(size_t __id) const noexcept { |
| 44 | if (__id >= __size_) |
| 45 | return basic_format_arg<_Context>{}; |
| 46 | |
| 47 | if (__format::__use_packed_format_arg_store(__size_)) |
| 48 | return basic_format_arg<_Context>{__format::__get_packed_type(__types_, __id), __values_[__id]}; |
| 49 | |
| 50 | return __args_[__id]; |
| 51 | } |
| 52 | |
| 53 | _LIBCPP_HIDE_FROM_ABI size_t __size() const noexcept { return __size_; } |
| 54 | |
| 55 | private: |
| 56 | size_t __size_{0}; |
| 57 | // [format.args]/5 |
| 58 | // [Note 1: Implementations are encouraged to optimize the representation of |
| 59 | // basic_format_args for small number of formatting arguments by storing |
| 60 | // indices of type alternatives separately from values and packing the |
| 61 | // former. - end note] |
| 62 | union { |
| 63 | struct { |
| 64 | const __basic_format_arg_value<_Context>* __values_; |
| 65 | uint64_t __types_; |
| 66 | }; |
| 67 | const basic_format_arg<_Context>* __args_; |
| 68 | }; |
| 69 | }; |
| 70 | |
| 71 | template <class _Context, class... _Args> |
| 72 | basic_format_args(__format_arg_store<_Context, _Args...>) -> basic_format_args<_Context>; |
| 73 | |
| 74 | #endif // _LIBCPP_STD_VER >= 20 |
| 75 | |
| 76 | _LIBCPP_END_NAMESPACE_STD |
| 77 | |
| 78 | #endif // _LIBCPP___FORMAT_FORMAT_ARGS_H |
| 79 |
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