mirror of
https://github.com/triqs/dft_tools
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ff3de6c5e7
- for pieces that need to be precomputed for several measures. - put them under shared_ptr, and register then with add_measure_aux. - they must be callable, as void (). - TODO : add this in the doc when tested
53 lines
1.8 KiB
C++
53 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) 2014 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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#pragma once
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#include <functional>
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#include <memory>
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#include <map>
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namespace triqs {
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namespace mc_tools {
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// mini concept checking : does T have void operator()() ?
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template <typename T, typename Enable = void> struct is_callable : std::false_type {};
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template <typename T> struct is_callable<T, decltype(std::declval<T>()())> : std::true_type {};
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//--------------------------------------------------------------------
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class measure_aux {
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std::shared_ptr<void> impl_;
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std::function<void()> call_;
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public:
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template <typename MeasureAuxType> measure_aux(std::shared_ptr<MeasureAuxType> p) {
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static_assert(is_callable<MeasureAuxType>::value, "This measure_aux is not callable");
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impl_ = p;
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call_ = [p]() mutable { (*p)(); }; // without the mutable, the operator () of the lambda is const, hence p ...
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}
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void operator()() { call_(); }
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};
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}
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} // end namespace
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