getting boost::program_options to treat input as const char* instead of std::string

Question

class Foo {};
Foo foo;

namespace po = boost::program_options;

boost::program_options::options_description desc("Allowed options")
desc.add_options()
    ("foo", po::value<Foo>(&foo));

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

The above will eventually try to do a lex_cast from std::string& to Foo&

Is there a way for it to do a lex_cast from const char*& to Foo& instead?

Thanks!

so this is a compile time problem? Not a runtime problem? – Sam Miller Apr 05 '12 at 14:06 — Sam Miller, Apr 05 '12 at 14:06

score 0 · Answer 1 · answered Apr 06 '12 at 00:32

0

You can handle this by defining an istream operator for Foo:

std::istream& operator>>(std::istream &input_stream, Foo &foo) {
    // read from input_stream into foo...
    // if read fails, set failbit in input_stream...
    return input_stream;
}

answered Apr 06 '12 at 00:32

Fraser

74,704
20
238
215

getting boost::program_options to treat input as const char* instead of std::string

1 Answers1