小编Jac*_*sky的帖子

当您使用Boost库时program_options,可以非常轻松地为您的程序打印帮助:

boost::program_options::variables_map options;
boost::program_options::options_description optionsDesc;
boost::program_options::positional_options_description positionalOptionsDesc;
//...
if(options.count("help"))
{
    cerr << optionsDesc << endl;
}

但是,如何将选项添加positional_options_description到帮助消息中？在本教程中,我可以在本节末尾看到这种设置的输出:

http://www.boost.org/doc/libs/1_52_0/doc/html/program_options/tutorial.html#id2607297

该选项input-file打印在帮助中,它是位置.但我看不到代码.是否有内置的方式来打印它,就像options_description你需要手动操作一样？显然这<<不起作用positional_options_description,编译错误是:

error: cannot bind ‘std::ostream {aka std::basic_ostream<char>}’ lvalue to ‘std::basic_ostream<char>&&’