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_ENABLE_INSERTABLE_H 11 #define _LIBCPP___FORMAT_ENABLE_INSERTABLE_H 12 13 #include <__config> 14 15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16 # pragma GCC system_header 17 #endif 18 19 _LIBCPP_BEGIN_NAMESPACE_STD 20 21 #if _LIBCPP_STD_VER >= 20 22 23 namespace __format { 24 25 /// Opt-in to enable \ref __insertable for a \a _Container. 26 template <class _Container> 27 inline constexpr bool __enable_insertable = false; 28 29 } // namespace __format 30 31 #endif //_LIBCPP_STD_VER >= 20 32 33 _LIBCPP_END_NAMESPACE_STD 34 35 #endif // _LIBCPP___FORMAT_ENABLE_INSERTABLE_H 36