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Backport as_const C++17 helper

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This is expecially useful to use const_iterator without giving up on
  using auto keyword
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Gioacchino Mazzurco 2019-10-30 14:24:19 +01:00
parent aabba04be9
commit 05260ace94
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2 changed files with 36 additions and 0 deletions
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1
libretroshare/src/libretroshare.pro
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@ -503,6 +503,7 @@ HEADERS += util/folderiterator.h \
util/stacktrace.h \
util/rsdeprecate.h \
util/cxx11retrocompat.h \
util/cxx17retrocompat.h \
util/rsurl.h
SOURCES += ft/ftchunkmap.cc \

35
libretroshare/src/util/cxx17retrocompat.h Normal file
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@ -0,0 +1,35 @@
/*******************************************************************************
* libretroshare/src/util: cxx17retrocompat.h *
* *
* libretroshare: retroshare core library *
* *
* Copyright (C) 2019 Gioacchino Mazzurco <gio@eigenlab.org> *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation, either version 3 of the *
* License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <https://www.gnu.org/licenses/>. *
* *
*******************************************************************************/
#pragma once
#if __cplusplus < 201703L
#include <type_traits>
namespace std
{
using namespace std;
template <class T> constexpr typename add_const<T>::type& as_const(T& t) noexcept
{ return t; }
template <class T> void as_const(const T&&) = delete;
}
#endif // __cplusplus < 201703L