svector.hh

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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis 
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA 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 should have received a copy of the GNU General Public License
 * along with MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef mia_core_svector_hh
#define mia_core_svector_hh

#include <istream>
#include <ostream>
#include <sstream>
#include <vector>
#include <stdexcept>

#include <mia/core/errormacro.hh>
#include <mia/core/typedescr.hh>

NS_MIA_BEGIN

template <typename T> 
std::ostream& operator << (std::ostream& os, const std::vector<T>& v) {
        auto i = v.begin();
        auto e = v.end(); 

        if (i != e)
                os << *i++;
        while (i != e)
                os << "," << *i++;
        return os; 
}

template <typename T> 
struct __dispatch_translate {
        static bool apply(const std::string& str, T& v){
                char c; 
                std::istringstream s(str); 
                s >> v;
                if (s.fail())
                        return false; 
                while (!s.eof() && s.peek() == ' ') 
                        s >> c; 
                return s.eof(); 
        }
}; 

template <> 
struct __dispatch_translate<std::string> {
        static bool apply(const std::string& s, std::string& str){
                str = s; 
                return true; 
        }
}; 


template <typename T> 
std::istream&  operator >> (std::istream& is, std::vector<T>& v)
{
        std::vector<T> values; 
        std::string token; 
        T val; 
        
        while(std::getline(is, token, ',')) {
                if (__dispatch_translate<T>::apply(token, val))
                        values.push_back(val); 
                else {
                        throw create_exception<std::invalid_argument>("Reading vector: value, '", token, 
                                                                      "' could not be translate to ", 
                                                                      mia::__type_descr<T>::value);
                }
        }
        
        if (!v.empty() && v.size() != values.size()) {
                        throw create_exception<std::invalid_argument>("Reading vector: expected ", 
                                                                 v.size(), " values, but got ", values.size()); 
        }
        v.swap(values); 
        return is; 
}


NS_MIA_END

#endif