使用 Boost.Program_options,我的代码如下:
namespace po = boost::program_options;
namespace ct = boost::container;
在特定函数中:
Options opts;
ct::string fname;
ct::vector<ct::string> others;
{ po::options_description general("General");
general.add_options()
("version,v", "Print version information")
("help,h", "Show help message")
("verbosity,V", po::value(&opts.verbosity)->default_value(0)->value_name("level"), "Runtime noise")
("main-is,m", po::value(&fname)->default_value("Main.pbc")->value_name("fname"), "Program filename")
/* error */ ("sideload,l", po::value<ct::vector<ct::string> >(&others)->multitoken(), "Other modules")
;
po::options_description performance("Performance");
performance.add_options()
// ... code removed here ...
;
po::positional_options_description modules;
modules.add("main-is", 1).add("sideload", -1);
po::options_description cmdline;
cmdline.add(general).add(performance);
po::variables_map vm;
try {
po::store(po::command_line_parser(argc, argv).options(cmdline).positional(modules).run(), vm);
po::notify(vm);
}
catch (const std::exception &e) {
std::cout << e.what() << std::endl;
return EXIT_FAILURE;
}
if (vm.count("help") || argc == 1) {
version();
std::cout << std::endl << "USAGE: " << argv[0] << " [options] MAIN.pbc [sideload modules ...]" << std::endl;
std::cout << cmdline << std::endl;
return EXIT_SUCCESS;
}
if (vm.count("version")) {
version();
return EXIT_SUCCESS;
}
}
我收到一个如下所示的错误:
In file included from /Users/kvanb/git/panthera/panthera/src/main.cpp:7:
In file included from /usr/local/include/boost/program_options/options_description.hpp:13:
In file included from /usr/local/include/boost/program_options/value_semantic.hpp:14:
/usr/local/include/boost/lexical_cast.hpp:388:13: error: static_assert failed "Target type is
neither std::istream`able nor std::wistream`able"
...BOOST_STATIC_ASSERT_MSG((result_t::value || boost::has_right_shift<std::basic_istream<wchar_t>, T >::value),
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
如果我注释掉上面注释的 /* error */
行,它就会消失。
我尝试使用 std::vector
和 std::string
代替,但错误仍然相同。
想法?
最佳答案
Porgram Options 显然不支持 Boost Container 的 boost::container::vector
输入多值选项。
您可以使用std::vector<ct::string>
,或者寻找专门支持的特征 ct::vector
还有
例如在boost/program_options/detail/value_semantic.hpp
您需要为 boost::container::vector
添加重载:
/** Validates sequences. Allows multiple values per option occurrence
and multiple occurrences. */
template<class T, class charT>
void validate(boost::any& v,
const std::vector<std::basic_string<charT> >& s,
boost::conatainer::vector<T>*, // HERE!
int)
老实说,正如你所看到的,他们甚至不支持 std::vector
使用自定义分配器。我认为开发人员不会急于实现这一点;实现已经足够复杂了(调整重载以允许编译器不能正确执行模板实例化的部分排序)。
关于c++ - 使用 boost vector 和字符串的奇怪 boost program_options 问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24235382/