mirror of
https://github.com/triqs/dft_tools
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67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
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/*******************************************************************************
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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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class fold_worker {
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F f;
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typedef typename boost::remove_const<typename boost::remove_reference<typename F::result_type >::type>::type result_type;
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template<class A>
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struct fold_func_adaptor {
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A const & b;
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F f; result_type r;
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fold_func_adaptor(F f_, A const & a_,typename A::value_type init ):b(a_), f(f_) { r= init;}
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template<typename ... Args> void operator()(Args const & ... args) { r = f(r,b(args...)); }
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};
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public:
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fold_worker ( F const & f_):f(f_) {}
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template<class A>
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result_type operator() (A const & a, typename A::value_type init = typename A::value_type() ) const {
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fold_func_adaptor<A> func(f,a,init);
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//fold_func_adaptor<typename A::value_type> func(f,init);
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foreach(a,std::ref(func));
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//foreach(a,boost::ref(func));
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return func.r;
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}
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};
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template<class F> fold_worker<F> fold (F const & f) { return fold_worker<F>(f);}
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template<typename R, typename A1>
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fold_worker< boost::function<R(A1,A1)> >
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fold (R (*f)(A1,A1)) { return fold( boost::function<R(A1,A1)>(f)); }
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}}//namespace triqs::arrays
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#endif
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