libcxx/include/__format/enable_insertable.h

   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