...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::program_options::bool_switch
// In header: <boost/program_options/value_semantic.hpp> BOOST_PROGRAM_OPTIONS_DECL typed_value< bool > * bool_switch(); BOOST_PROGRAM_OPTIONS_DECL typed_value< bool > * bool_switch(bool * v);
Works the same way as the 'value<bool>' function, but the created value_semantic
won't accept any explicit value. So, if the option is present on the command line, the value will be 'true'.