C++ std:：vector的Boost自定义验证器<；双倍>；

我已经为

std:：vector

编写了以下自定义验证器

typedef矢量坐标；
无效验证（boost:：any&v、，
常量向量和值，
坐标*，整数）{
std:：cout您应该编写一个自定义转换：


#include <boost/program_options.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/classification.hpp>
#include <fstream>
#include <iostream>

namespace po = boost::program_options;
typedef std::vector<double> coordinate;

int main() {
    coordinate c;

    // Setup options.
    po::options_description desc("Options");
    desc.add_options()
        ("instruments.prop", po::value<std::string>()->multitoken()->notifier([&c](std::string const& v) {
             auto it = boost::make_split_iterator(v, boost::token_finder(boost::algorithm::is_any_of(" ,")));
             std::transform(it, {}, back_inserter(c), [](auto& s) {
                        return boost::lexical_cast<double>(s);
                     });
         }),
         "plugin names" );

    std::ifstream ifs("input.txt");
    po::variables_map vm;
    store(po::parse_config_file(ifs, desc, false), vm);
    po::notify(vm);

    std::copy(c.begin(), c.end(), std::ostream_iterator<double>(std::cout << "c: ", " "));
    std::cout << "\n";
}

coordinate c;
// Setup options.
po::options_description desc("Options");
desc.add_options()
  ("instruments.prop", po::value<coordinate>( &c )->multitoken(),
   "plugin names" );

#include <boost/program_options.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/classification.hpp>
#include <fstream>
#include <iostream>

namespace po = boost::program_options;
typedef std::vector<double> coordinate;

int main() {
    coordinate c;

    // Setup options.
    po::options_description desc("Options");
    desc.add_options()
        ("instruments.prop", po::value<std::string>()->multitoken()->notifier([&c](std::string const& v) {
             auto it = boost::make_split_iterator(v, boost::token_finder(boost::algorithm::is_any_of(" ,")));
             std::transform(it, {}, back_inserter(c), [](auto& s) {
                        return boost::lexical_cast<double>(s);
                     });
         }),
         "plugin names" );

    std::ifstream ifs("input.txt");
    po::variables_map vm;
    store(po::parse_config_file(ifs, desc, false), vm);
    po::notify(vm);

    std::copy(c.begin(), c.end(), std::ostream_iterator<double>(std::cout << "c: ", " "));
    std::cout << "\n";
}

c: 1 2.9