mirror of
https://github.com/triqs/dft_tools
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98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2013 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_UTILITY_FACTORY_H
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#define TRIQS_UTILITY_FACTORY_H
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#include <type_traits>
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#include <vector>
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#include "./macros.hpp"
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#include "./std_vector_expr_template.hpp"
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namespace triqs { namespace utility {
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template <typename T>
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struct factories {
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template < typename U> static T invoke( U && x) { return T(std::forward<U>(x));}
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};
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template <typename T>
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struct factories <std::vector<T>>{
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typedef std::vector<T> R;
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static R invoke(R && x) { return R(std::move(x));}
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static R invoke(R const & x) { return R(x);}
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static R invoke(R & x) { return R(x);}
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template <typename U> static R invoke( std::vector<U> && v) {
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static_assert(std::is_constructible<T,U>::value, "Can not make std::vector<T> from std::vector<U>");
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R r; r.reserve(v.size());
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for (auto & x : v) r.push_back(std::move(x));
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return r;
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}
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template <typename VectorType>
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static TYPE_ENABLE_IF(R,ImmutableStdVector<VectorType>) invoke( VectorType const & v) {
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static_assert(std::is_constructible<T,decltype(v[0])>::value, "Can not make std::vector<T> from the proposed type");
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R r; r.reserve(v.size());
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for(size_t i=0; i<v.size(); ++i) r.push_back(T(v[i]));
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return r;
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}
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/*
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template <typename U> static R invoke( std::vector<U> const & v) {
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static_assert(std::is_constructible<T,U>::value, "Can not make std::vector<T> from std::vector<U>");
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R r; r.reserve(v.size());
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for (auto & x : v) r.push_back(T(x));
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return r;
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}
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*/
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};
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template <typename T, typename ... U> T factory(U && ... x) { return factories<T>::invoke(std::forward<U>(x)...);}
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// redondant : done with x =factory<T>(x)
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//
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/* template <typename T>
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struct gal_assign {
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template < typename U> static void invoke(T & x, U && y) { x = std::forward<U>(y);}
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};
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template <typename T>
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struct gal_assign<std::vector<T>> {
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typedef std::vector<T> R;
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static void invoke(R & x, R && y) { x=std::move(y);}
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static void invoke(R & x, R const & y) { x=y;}
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template <typename U> static R invoke( R &r, std::vector<U> && v) {
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static_assert(std::is_constructible<T,U>::value, "Can not assign std::vector<U> && -> std::vector<T>");
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r.clear(); r.reserve(v.size());
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for (auto & x : v) r.push_back(std::move(x));
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}
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template <typename U> static R invoke( R &r, std::vector<U> const & v) {
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static_assert(std::is_constructible<T,U>::value, "Can not assign std::vector<U> const & -> std::vector<T>");
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r.clear(); r.reserve(v.size());
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for (auto & x : v) r.push_back(x);
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}
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};
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*/
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}}//namespace triqs
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#endif
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