f08df56d3a
This adds the new std::enable_nonlocking_formatter_optimization trait in <format>. This trait will be used in std::print to implement the performance benefits. Implements parts of - P3107R5 - Permit an efficient implementation of ``std::print``
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
// -*- 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_FORMATTER_H
|
|
#define _LIBCPP___FORMAT_FORMATTER_H
|
|
|
|
#include <__config>
|
|
#include <__fwd/format.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if _LIBCPP_STD_VER >= 20
|
|
|
|
/// The default formatter template.
|
|
///
|
|
/// [format.formatter.spec]/5
|
|
/// If F is a disabled specialization of formatter, these values are false:
|
|
/// - is_default_constructible_v<F>,
|
|
/// - is_copy_constructible_v<F>,
|
|
/// - is_move_constructible_v<F>,
|
|
/// - is_copy_assignable<F>, and
|
|
/// - is_move_assignable<F>.
|
|
template <class _Tp, class _CharT>
|
|
struct _LIBCPP_TEMPLATE_VIS formatter {
|
|
formatter() = delete;
|
|
formatter(const formatter&) = delete;
|
|
formatter& operator=(const formatter&) = delete;
|
|
};
|
|
|
|
# if _LIBCPP_STD_VER >= 23
|
|
|
|
template <class _Tp>
|
|
constexpr bool enable_nonlocking_formatter_optimization = false;
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI constexpr void __set_debug_format(_Tp& __formatter) {
|
|
if constexpr (requires { __formatter.set_debug_format(); })
|
|
__formatter.set_debug_format();
|
|
}
|
|
|
|
# endif // _LIBCPP_STD_VER >= 23
|
|
#endif // _LIBCPP_STD_VER >= 20
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___FORMAT_FORMATTER_H
|