FromFile.h

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//
// Struct FromFile
//   Simple functor that reads vector data from a file. If the file contains
//   more than one value the sum is returned.
//   \f[
//     result = \sum_{i=0}^n value_i
//   \f]
//
// Copyright (c) 2010 - 2013, Yves Ineichen, ETH Zürich
// All rights reserved
//
// Implemented as part of the PhD thesis
// "Toward massively parallel multi-objective optimization with application to
// particle accelerators" (https://doi.org/10.3929/ethz-a-009792359)
//
// This file is part of OPAL.
//
// OPAL 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.
//
// You should have received a copy of the GNU General Public License
// along with OPAL. If not, see <https://www.gnu.org/licenses/>.
//
#ifndef __FROMFILE_H__
#define __FROMFILE_H__
 
#include <fstream>
#include <iterator>
#include <map>
#include <set>
#include <string>
#include <tuple>
#include <variant>
 
#include "Util/Types.h"
#include "Util/OptPilotException.h"
#include "Expression/Parser/function.hpp"
 
struct FromFile {
 
    static const std::string name;
 
    Expressions::Result_t operator()(client::function::arguments_t args) {
        if (args.size() != 1) {
            throw OptPilotException("FromFile::operator()",
                                    "fromFile expects 1 arguments, " + std::to_string(args.size()) + " given");
        }
 
        filename_ = std::get<std::string>(args[0]);
 
        double sum = 0;
        bool is_valid = true;
 
        try {
            readValues();
        } catch(const OptPilotException& e) {
            return std::make_tuple(0.0, false);
        }
 
        for(double obj_value : values_)
            sum += obj_value;
 
        return std::make_tuple(sum, is_valid);
    }
 
 
private:
 
    std::vector<double> values_;
 
    std::string filename_;
 
    void readValues();
 
};
 
#endif