Unused parameter and shadowed member warnings in errors.hpp

[Kenneth Moreland <kmorel@…>]

This code

#include <boost/program_options/errors.hpp>

int main(int, char *[]) { return 0; }

compiled with

gcc -I/path/to/boost -c -Wunused-parameter -Wshadow test.cxx

produces a warning about an unused parameter and several warnings about shadowed class members:

/opt/local/include/boost/program_options/errors.hpp:253: warning: unused parameter 'option_name'
/opt/local/include/boost/program_options/errors.hpp: In constructor 'boost::program_options::invalid_syntax::invalid_syntax(boost::program_options::invalid_syntax::kind_t, const std::string&, const std::string&, int)':
/opt/local/include/boost/program_options/errors.hpp:311: warning: declaration of 'kind' shadows a member of 'this'
/opt/local/include/boost/program_options/errors.hpp: In constructor 'boost::program_options::invalid_config_file_syntax::invalid_config_file_syntax(const std::string&, boost::program_options::invalid_syntax::kind_t)':
/opt/local/include/boost/program_options/errors.hpp:331: warning: declaration of 'kind' shadows a member of 'this'
/opt/local/include/boost/program_options/errors.hpp: In constructor 'boost::program_options::invalid_command_line_syntax::invalid_command_line_syntax(boost::program_options::invalid_syntax::kind_t, const std::string&, const std::string&, int)':
/opt/local/include/boost/program_options/errors.hpp:350: warning: declaration of 'kind' shadows a member of 'this'

This was compile on Mac Snow Leopard, gcc 4.2.1 with the boost distribution from macports (although I doubt any of that matters).

[Kenneth Moreland <kmorel@…>]

I also discovered another shadowed parameter warning on line 232 of value_semantic.hpp. You can see all of the warnings if you compile

#include <boost/program_options.hpp>

int main(int, char *[]) { return 0; }

with the -Wunused-parameter and -Wshadow flags.