mirror of
https://github.com/triqs/dft_tools
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54 lines
1.8 KiB
C++
54 lines
1.8 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) 2012 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_ARRAYS_EXPRESSION_FOLD_H
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#define TRIQS_ARRAYS_EXPRESSION_FOLD_H
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/function.hpp>
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#include "../array.hpp"
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namespace triqs { namespace arrays {
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template<class F>
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struct fold_worker {
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F f;
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template<class A, class R> struct fold_func_adaptor {
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F const & f; A const & a; R & r;
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template<typename ... Args> void operator()(Args const & ... args) { r = f(r,a(args...)); }
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};
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template<class A, class R>
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R operator() (A const & a, R init) const {
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foreach(a, fold_func_adaptor<A,R> {f,a,init});
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return init;
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}
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template<class A> typename A::value_type operator() (A const & a) const { return (*this)(a, typename A::value_type{});}
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};
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template<class F> fold_worker<F> fold (F f) { return {std::move(f)};}
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}}//namespace triqs::arrays
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#endif
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