mc_measure_aux_set.hpp

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// Copyright (c) 2013-2018 Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
// Copyright (c) 2013-2018 Centre national de la recherche scientifique (CNRS)
// Copyright (c) 2018-2020 Simons Foundation
//
// This program 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.
//
// This program 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 may obtain a copy of the License at
//     https://www.gnu.org/licenses/gpl-3.0.txt
//
// Authors: Michel Ferrero, Olivier Parcollet, Nils Wentzell

 
#pragma once
 
#include <concepts>
#include <memory>
 
namespace triqs::mc_tools {

  class measure_aux {
    private:
    // Auxiliary MC measure concept defines the interface for auxiliary MC measures.
    struct measure_aux_concept {
      virtual ~measure_aux_concept() = default;
      virtual void call()            = 0;
    };
 
    // Auxiliary MC measure model implements the auxiliary MC measure concept by calling the appropriate methods of the
    // type earased object.
    template <typename T>
      requires(std::invocable<T>)
    struct measure_aux_model : public measure_aux_concept {
      std::shared_ptr<T> ptr_;
      measure_aux_model(std::shared_ptr<T> const &m_ptr) : ptr_{m_ptr} {}
      void call() override { return (*ptr_)(); }
    };
 
    public:
    template <typename T>
      requires(std::invocable<T>)
    measure_aux(std::shared_ptr<T> const &m_ptr) : ptr_{std::make_unique<measure_aux_model<T>>(m_ptr)} {}

    void operator()() { ptr_->call(); }
 
    private:
    std::unique_ptr<measure_aux_concept> ptr_;
  };
 
} // namespace triqs::mc_tools