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_FORMATTER_H 11 #define _LIBCPP___FORMAT_FORMATTER_H 12 13 #include <__config> 14 #include <__fwd/format.h> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 #if _LIBCPP_STD_VER >= 20 23 24 struct __disabled_formatter { 25 __disabled_formatter() = delete; 26 __disabled_formatter(const __disabled_formatter&) = delete; 27 __disabled_formatter& operator=(const __disabled_formatter&) = delete; 28 }; 29 30 /// The default formatter template. 31 /// 32 /// [format.formatter.spec]/5 33 /// If F is a disabled specialization of formatter, these values are false: 34 /// - is_default_constructible_v<F>, 35 /// - is_copy_constructible_v<F>, 36 /// - is_move_constructible_v<F>, 37 /// - is_copy_assignable_v<F>, and 38 /// - is_move_assignable_v<F>. 39 template <class _Tp, class _CharT> 40 struct formatter : __disabled_formatter {}; 41 42 # if _LIBCPP_STD_VER >= 23 43 44 template <class _Tp> 45 constexpr bool enable_nonlocking_formatter_optimization = false; 46 47 template <class _Tp> __set_debug_format(_Tp & __formatter)48_LIBCPP_HIDE_FROM_ABI constexpr void __set_debug_format(_Tp& __formatter) { 49 if constexpr (requires { __formatter.set_debug_format(); }) 50 __formatter.set_debug_format(); 51 } 52 53 # endif // _LIBCPP_STD_VER >= 23 54 #endif // _LIBCPP_STD_VER >= 20 55 56 _LIBCPP_END_NAMESPACE_STD 57 58 #endif // _LIBCPP___FORMAT_FORMATTER_H 59