ffe262a198
This changes the implementation of the formatter. Instead of inheriting from a specialized parser all formatters will use the same generic parser. This reduces the binary size. The new parser contains some additional fields only used in the chrono formatting. Since this doesn't change the size of the parser the fields are in the generic parser. The parser is designed to fit in 128-bit, making it cheap to pass by value. The new format function is a const member function. This isn't required by the Standard yet, but it will be after LWG-3636 is accepted. Additionally P2286 adds a formattable concept which requires the member function to be const qualified in C++23. This paper is likely to be accepted in the 2022 July plenary. This is based on D125606. That commit did the groundwork and did similar changes for the string formatters. Depends on D128139. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D128671
74 lines
2.8 KiB
C++
74 lines
2.8 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_FORMATTER_POINTER_H
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#define _LIBCPP___FORMAT_FORMATTER_POINTER_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 <__format/format_parse_context.h>
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#include <__format/formatter.h>
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#include <__format/formatter_integral.h>
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#include <__format/formatter_output.h>
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#include <__format/parser_std_format_spec.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 <__formatter::__char_type _CharT>
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struct _LIBCPP_TEMPLATE_VIS __formatter_pointer {
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public:
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constexpr __formatter_pointer() { __parser_.__alignment_ = __format_spec::__alignment::__right; }
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_LIBCPP_HIDE_FROM_ABI constexpr auto
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parse(basic_format_parse_context<_CharT>& __parse_ctx) -> decltype(__parse_ctx.begin()) {
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auto __result = __parser_.__parse(__parse_ctx, __format_spec::__fields_pointer);
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__format_spec::__process_display_type_pointer(__parser_.__type_);
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return __result;
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}
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_LIBCPP_HIDE_FROM_ABI auto format(const void* __ptr, auto& __ctx) const -> decltype(__ctx.out()) {
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__format_spec::__parsed_specifications<_CharT> __specs = __parser_.__get_parsed_std_specifications(__ctx);
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__specs.__std_.__alternate_form_ = true;
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__specs.__std_.__type_ = __format_spec::__type::__hexadecimal_lower_case;
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return __formatter::__format_integer(reinterpret_cast<uintptr_t>(__ptr), __ctx, __specs);
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}
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__format_spec::__parser<_CharT> __parser_;
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};
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// [format.formatter.spec]/2.4
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// For each charT, the pointer type specializations template<>
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// - struct formatter<nullptr_t, charT>;
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// - template<> struct formatter<void*, charT>;
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// - template<> struct formatter<const void*, charT>;
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template <__formatter::__char_type _CharT>
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struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<nullptr_t, _CharT>
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: public __formatter_pointer<_CharT> {};
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template <__formatter::__char_type _CharT>
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struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<void*, _CharT> : public __formatter_pointer<_CharT> {
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};
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template <__formatter::__char_type _CharT>
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struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const void*, _CharT>
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: public __formatter_pointer<_CharT> {};
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#endif //_LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FORMAT_FORMATTER_POINTER_H
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