具有多个令牌的boost :: program_options配置文件选项 [英] boost::program_options config file option with multiple tokens

问题描述

我似乎无法像从命令行中一样从配置文件多令牌选项中读取内容.配置文件的语法是什么?

I can not seem to be able to read from config file multitoken options like I can from command line. What is the syntax for the config file?

这是添加选项说明的方式:

This is how the option description is added:

//parser.cpp
- - -
po::options_description* generic;
generic=new po::options_description("Generic options");
generic->add_options()
("coordinate",po::value<std::vector<double> >()->multitoken(),"Coordinates (x,y)");

之后，我解析命令和配置文件.

After which I parse command and config-files.

在命令行-坐标1 2"上工作.但是，当我尝试使用配置文件时:

On command line '--coordinate 1 2' works. However, when I try in config file:

coordinate = 1,2

或

coordinate= 1 2

它无法给出invalid_option_value异常.那么在使用多令牌选项的情况下，配置文件的语法到底是什么?

It fails giving a invalid_option_value exception. So what exactly is the syntax for config files in case of multitoken options?

推荐答案

您可以通过编写自定义验证程序来实现所需的行为.此自定义验证器接受:

You can achieve the behavior you seek by writing a custom validator. This custom validator accepts :

./progname --coordinate 1 2
./progname --coordinate "1 2"
#In config file:
coordinate= 1 2

这是代码:

struct coordinate {
  double x,y;
};

void validate(boost::any& v,
  const vector<string>& values,
  coordinate*, int) {
  coordinate c;
  vector<double> dvalues;
  for(vector<string>::const_iterator it = values.begin();
    it != values.end();
    ++it) {
    stringstream ss(*it);
    copy(istream_iterator<double>(ss), istream_iterator<double>(),
      back_inserter(dvalues));
    if(!ss.eof()) {
      throw po::validation_error("Invalid coordinate specification");
    }
  }
  if(dvalues.size() != 2) {
    throw po::validation_error("Invalid coordinate specification");
  }
  c.x = dvalues[0];
  c.y = dvalues[1];
  v = c;
}
...
    po::options_description config("Configuration");
    config.add_options()
        ("coordinate",po::value<coordinate>()->multitoken(),"Coordinates (x,y)")
        ;

参考文献:

• http://www.boost .org/doc/libs/1_46_1/doc/html/program_options/howto.html#id2219998
• https://stackoverflow.com/tags/boost-program-options/hot
• 使用Boost的program_options处理复杂选项

• http://www.boost.org/doc/libs/1_46_1/doc/html/program_options/howto.html#id2219998
• https://stackoverflow.com/tags/boost-program-options/hot
• Handle complex options with Boost's program_options

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