889302292b
Instead of writing every character directly into the container by using a `back_insert_iterator` the data is buffered in an `array`. This buffer is then inserted to the container by calling its `insert` member function. Since there's no guarantee every container's `insert` behaves properly containers need to opt-in to this behaviour. The appropriate standard containers opt-in to this behaviour. This change improves the performance of the format functions that use a `back_insert_iterator`. Depends on D110495 Reviewed By: ldionne, vitaut, #libc Differential Revision: https://reviews.llvm.org/D110497
36 lines
930 B
C++
36 lines
930 B
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___FORMAT_ENABLE_INSERTABLE_H
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#define _LIBCPP___FORMAT_ENABLE_INSERTABLE_H
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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namespace __format {
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/// Opt-in to enable \ref __insertable for a \a _Container.
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template <class _Container>
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inline constexpr bool __enable_insertable = false;
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} // namespace __format
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#endif //_LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FORMAT_ENABLE_INSERTABLE_H
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