0922ce56f4
This implements the struct `__format_arg_store` and its dependencies: * the class basic_format_arg, * the class basic_format_args, * the class basic_format_context, * the function make_format_args, * the function wmake_format_args, * the function visit_format_arg, * several Standard required typedefs. The following parts will be implemented in a later patch: * the child class `basic_format_arg::handle`, * the function `basic_format_arg::basic_format_arg(const T* p)`. The following extension has been implemented: * the class basic_format_arg supports `__[u]int128_t` on platform where libc++ supports 128 bit integrals. Implements parts of: * P0645 Text Formatting Completes: * LWG3371 visit_format_arg and make_format_args are not hidden friends * LWG3542 basic_format_arg mishandles basic_string_view with custom traits Note https://mordante.github.io/blog/2021/06/05/format.html gives a bit more information about the goals and non-goals of this initial patch series. Reviewed By: #libc, ldionne, vitaut Differential Revision: https://reviews.llvm.org/D103357
63 lines
2.2 KiB
C++
63 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 SUPPORT_TEST_FORMAT_CONTEXT_HPP
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#define SUPPORT_TEST_FORMAT_CONTEXT_HPP
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/**
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* @file Helper functions to create a @ref std::basic_format_context.
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*
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* Since the standard doesn't specify how a @ref std::basic_format_context is
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* constructed this is implementation defined. To make the public API tests of
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* the class generic this header defines helper functions to create the
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* required object.
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*
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* @note This requires every standard library implementation to write their own
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* helper function. Vendors are encouraged to file a review at
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* https://reviews.llvm.org/ so their specific implementation can be part of
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* this file.
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*/
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#if TEST_STD_VER < 20
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#error "The format header requires at least C++20"
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#endif
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#include <format>
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#ifndef _LIBCPP_HAS_NO_LOCALIZATION
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#include <locale>
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#endif
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#if defined(_LIBCPP_VERSION)
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/** Creates a std::basic_format_context as-if the formatting function takes no locale. */
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template <class OutIt, class CharT>
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std::basic_format_context<OutIt, CharT> test_format_context_create(
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OutIt out_it,
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std::basic_format_args<std::basic_format_context<OutIt, CharT>> args) {
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return std::__format_context_create(std::move(out_it), args);
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}
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#ifndef _LIBCPP_HAS_NO_LOCALIZATION
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/** Creates a std::basic_format_context as-if the formatting function takes locale. */
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template <class OutIt, class CharT>
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std::basic_format_context<OutIt, CharT> test_format_context_create(
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OutIt out_it,
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std::basic_format_args<std::basic_format_context<OutIt, CharT>> args,
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std::locale loc) {
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return std::__format_context_create(std::move(out_it), args, std::move(loc));
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}
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#endif
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#else
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#error \
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"Please create a vendor specific version of the test functions and file a review at https://reviews.llvm.org/"
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#endif
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#endif // SUPPORT_TEST_FORMAT_CONTEXT_HPP
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