89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
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/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2017 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/**
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* @file make_unique.h
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* @brief Implementation of std::make_unique for pre C++14 compilation
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* environments
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*/
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#ifndef MAKE_UNIQUE_H
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#define MAKE_UNIQUE_H
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// Define std::make_unique if the compiler is C++11, but not C++14
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// (which provides this itself)
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// When C++14 support is a KiCad pre-requisite, this entire file
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// can be removed.
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#if __cplusplus == 201103L
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#include <cstddef>
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#include <memory>
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#include <type_traits>
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#include <utility>
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// It's a bit naughty to add things to std::, but the point is to
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// "polyfill" this function in only if std:: doesn't have it
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//
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// This implementation is the one proposed by Stephan T. Lavavej
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// in N3656: https://isocpp.org/files/papers/N3656.txt
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// This is more or less exactly how it is implemented in GCC (e.g. 6.3.1)
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// when C++14 is enabled.
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namespace std
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{
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template<class T> struct _Unique_if {
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typedef unique_ptr<T> _Single_object;
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};
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template<class T> struct _Unique_if<T[]> {
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typedef unique_ptr<T[]> _Unknown_bound;
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};
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template<class T, size_t N> struct _Unique_if<T[N]> {
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typedef void _Known_bound;
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};
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/// std::make_unique for single objects
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template<class T, class... Args>
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typename _Unique_if<T>::_Single_object
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make_unique(Args&&... args) {
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return unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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/// std::make_unique for arrays of unknown bound
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template<class T>
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typename _Unique_if<T>::_Unknown_bound
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make_unique(size_t n) {
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typedef typename remove_extent<T>::type U;
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return unique_ptr<T>(new U[n]());
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}
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/// Disable std::make_unique for arrays of known bound
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template<class T, class... Args>
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typename _Unique_if<T>::_Known_bound
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make_unique(Args&&...) = delete;
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}
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#endif // __cplusplus == 201103L
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#endif // WXSTRUCT_H_
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