c++ - 如何使用 Boost.program_options 检测拼写错误？

Question

我使用 boost.program_options 库。考虑这个简化的案例。

po::options_description desc("Usage");
desc.add_options()
("uninstall,u", "uninstall program")
("custom,c", po::wvalue<std::wstring>(), "specify custom action");

po::variables_map vm;
po::store(po::parse_command_line(argc, argv, desc), vm);
po::notify(vm);

我想在这样的命令行上产生错误:

testprog.exe -u c- action1

请注意，用户打错了“c-”而不是“-c”。但是解析器将其理解为单个 -u 选项。我该如何处理这种情况？

Answer 1

I want to produce error on such command-line:

testprog.exe -u c- action1

Note, user made a typo "c-" instead of "-c". But the parser understands this as a single -u option. How do I handle such cases?

指示 program_options 库不接受任何位置参数，您将获得所需的行为

编码&编译:

macmini:stackoverflow samm$ cat po.cc
#include <boost/program_options.hpp>
#include <boost/version.hpp>

#include <iostream>

int
main(int argc, char* argv[])
{
    namespace po = boost::program_options;
    po::options_description desc("Usage");
    desc.add_options()
        ("uninstall,u", "uninstall program")
        ("custom,c", po::wvalue<std::wstring>(), "specify custom action")
        ;

    po::variables_map vm;
    po::command_line_parser cmd_line( argc, argv );
    cmd_line.options( desc );
    cmd_line.positional( po::positional_options_description() );

    try {
        po::store( cmd_line.run(), vm );

        po::notify(vm);
    } catch ( const std::exception& e ) {
        std::cerr << e.what() << std::endl;
        return -1;
    }

    return 0;
}
macmini:stackoverflow samm$ g++ po.cc -I /opt/local/include -L/opt/local/lib -lboost_program_options -Wl,-rpath,/opt/local/lib

运行:

macmini:stackoverflow samm$ ./a.out -u c- action1
too many positional options
macmini:stackoverflow samm$ ./a.out -u -c action1
macmini:stackoverflow samm$