| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___FORMAT_FORMAT_ARGS_H |
| #define _LIBCPP___FORMAT_FORMAT_ARGS_H |
| |
| #include <__availability> |
| #include <__config> |
| #include <__format/format_arg.h> |
| #include <__format/format_arg_store.h> |
| #include <__format/format_fwd.h> |
| #include <cstddef> |
| #include <cstdint> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| template <class _Context> |
| class _LIBCPP_TEMPLATE_VIS basic_format_args { |
| public: |
| basic_format_args() noexcept = default; |
| |
| template <class... _Args> |
| _LIBCPP_HIDE_FROM_ABI basic_format_args(const __format_arg_store<_Context, _Args...>& __store) noexcept |
| : __size_(sizeof...(_Args)) { |
| if constexpr (sizeof...(_Args) != 0) { |
| if constexpr (__format::__use_packed_format_arg_store(sizeof...(_Args))) { |
| __values_ = __store.__storage.__values_; |
| __types_ = __store.__storage.__types_; |
| } else |
| __args_ = __store.__storage.__args_; |
| } |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| basic_format_arg<_Context> get(size_t __id) const noexcept { |
| if (__id >= __size_) |
| return basic_format_arg<_Context>{}; |
| |
| if (__format::__use_packed_format_arg_store(__size_)) |
| return basic_format_arg<_Context>{__format::__get_packed_type(__types_, __id), __values_[__id]}; |
| |
| return __args_[__id]; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI size_t __size() const noexcept { return __size_; } |
| |
| private: |
| size_t __size_{0}; |
| // [format.args]/5 |
| // [Note 1: Implementations are encouraged to optimize the representation of |
| // basic_format_args for small number of formatting arguments by storing |
| // indices of type alternatives separately from values and packing the |
| // former. - end note] |
| union { |
| struct { |
| const __basic_format_arg_value<_Context>* __values_; |
| uint64_t __types_; |
| }; |
| const basic_format_arg<_Context>* __args_; |
| }; |
| }; |
| |
| template <class _Context, class... _Args> |
| basic_format_args(__format_arg_store<_Context, _Args...>) -> basic_format_args<_Context>; |
| |
| #endif //_LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___FORMAT_FORMAT_ARGS_H |