mirror of
https://github.com/triqs/dft_tools
synced 2024-12-26 14:23:38 +01:00
8c725f8d5e
- h5/make_h5.... only used in parameters. - old boost includes before C++11 - remove boost serialization, make macro TRIQS_MAKE_NVP temporarely - remove boost::is_complex (can be written in 2 lines...) - move some lib in cpp
62 lines
2.1 KiB
C++
62 lines
2.1 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 "../array.hpp"
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namespace triqs {
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namespace arrays {
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template <class F> 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;
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A const& a;
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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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auto operator()(A const& a,
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R init) const -> typename std::decay<typename std::result_of<F(typename A::value_type, R)>::type>::type {
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// to take into account that f may be double,double -> double, while one passes 0 (an int...)
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// R = int, R2= double in such case, and the result will be a double, or narrowing will occur
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using R2 = typename std::decay<typename std::result_of<F(typename A::value_type, R)>::type>::type;
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R2 r2 = init;
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foreach(a, fold_func_adaptor<A, R2>{f, a, r2});
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return r2;
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}
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template <class A> typename A::value_type operator()(A const& a) const {
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return (*this)(a, typename A::value_type{});
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}
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};
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template <class F> fold_worker<F> fold(F f) {
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return {std::move(f)};
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}
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}
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} // namespace triqs::arrays
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#endif
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