v1/__format/enable_insertable.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___FORMAT_ENABLE_INSERTABLE_H
0011 #define _LIBCPP___FORMAT_ENABLE_INSERTABLE_H
0012
0013 #include <__config>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 _LIBCPP_BEGIN_NAMESPACE_STD
0020
0021 #if _LIBCPP_STD_VER >= 20
0022
0023 namespace __format {
0024
0025 /// Opt-in to enable \ref __insertable for a \a _Container.
0026 template <class _Container>
0027 inline constexpr bool __enable_insertable = false;
0028
0029 } // namespace __format
0030
0031 #endif // _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_END_NAMESPACE_STD
0034
0035 #endif // _LIBCPP___FORMAT_ENABLE_INSERTABLE_H