mirror of
https://github.com/triqs/dft_tools
synced 2024-12-25 05:43:40 +01:00
98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
/*******************************************************************************
|
|
*
|
|
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
|
|
*
|
|
* Copyright (C) 2013 by O. Parcollet
|
|
*
|
|
* TRIQS is free software: you can redistribute it and/or modify it under the
|
|
* terms of the GNU General Public License as published by the Free Software
|
|
* Foundation, either version 3 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* TRIQS 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 General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
******************************************************************************/
|
|
#ifndef TRIQS_UTILITY_FACTORY_H
|
|
#define TRIQS_UTILITY_FACTORY_H
|
|
#include <type_traits>
|
|
#include <vector>
|
|
#include "./macros.hpp"
|
|
#include "./std_vector_expr_template.hpp"
|
|
|
|
namespace triqs { namespace utility {
|
|
|
|
template <typename T>
|
|
struct factories {
|
|
template < typename U> static T invoke( U && x) { return T(std::forward<U>(x));}
|
|
};
|
|
|
|
template <typename T>
|
|
struct factories <std::vector<T>>{
|
|
typedef std::vector<T> R;
|
|
|
|
static R invoke(R && x) { return R(std::move(x));}
|
|
|
|
static R invoke(R const & x) { return R(x);}
|
|
|
|
static R invoke(R & x) { return R(x);}
|
|
|
|
template <typename U> static R invoke( std::vector<U> && v) {
|
|
static_assert(std::is_constructible<T,U>::value, "Cannot make std::vector<T> from std::vector<U>");
|
|
R r; r.reserve(v.size());
|
|
for (auto & x : v) r.push_back(std::move(x));
|
|
return r;
|
|
}
|
|
|
|
template <typename VectorType>
|
|
static TYPE_ENABLE_IF(R,ImmutableStdVector<VectorType>) invoke( VectorType & v) {
|
|
static_assert(std::is_constructible<T,decltype(v[0])>::value, "Cannot make std::vector<T> from the proposed type");
|
|
R r; r.reserve(v.size());
|
|
for(size_t i=0; i<v.size(); ++i) r.push_back(T(v[i]));
|
|
return r;
|
|
}
|
|
/*
|
|
template <typename U> static R invoke( std::vector<U> const & v) {
|
|
static_assert(std::is_constructible<T,U>::value, "Cannot make std::vector<T> from std::vector<U>");
|
|
R r; r.reserve(v.size());
|
|
for (auto & x : v) r.push_back(T(x));
|
|
return r;
|
|
}
|
|
*/
|
|
};
|
|
|
|
template <typename T, typename ... U> T factory(U && ... x) { return factories<T>::invoke(std::forward<U>(x)...);}
|
|
|
|
// redondant : done with x =factory<T>(x)
|
|
//
|
|
/* template <typename T>
|
|
struct gal_assign {
|
|
template < typename U> static void invoke(T & x, U && y) { x = std::forward<U>(y);}
|
|
};
|
|
|
|
template <typename T>
|
|
struct gal_assign<std::vector<T>> {
|
|
typedef std::vector<T> R;
|
|
static void invoke(R & x, R && y) { x=std::move(y);}
|
|
static void invoke(R & x, R const & y) { x=y;}
|
|
template <typename U> static R invoke( R &r, std::vector<U> && v) {
|
|
static_assert(std::is_constructible<T,U>::value, "Cannot assign std::vector<U> && -> std::vector<T>");
|
|
r.clear(); r.reserve(v.size());
|
|
for (auto & x : v) r.push_back(std::move(x));
|
|
}
|
|
template <typename U> static R invoke( R &r, std::vector<U> const & v) {
|
|
static_assert(std::is_constructible<T,U>::value, "Cannot assign std::vector<U> const & -> std::vector<T>");
|
|
r.clear(); r.reserve(v.size());
|
|
for (auto & x : v) r.push_back(x);
|
|
}
|
|
};
|
|
*/
|
|
|
|
}}//namespace triqs
|
|
#endif
|