[Boost-users] program_options: validation_error

Hi, validation_error constructor signature was changed from validation_error(const std::string &); in boost 1.41.0 to validation_error(kind_t, const std::string & = "", const std::string & = ""); in boost 1.42.0+ This way validation_error is backward-incompatible and "Custom Validators" (http://www.boost.org/doc/libs/1_43_0/doc/html/program_options/howto.html#id1...) section in html-documentations has an wrong example that uses 'validation_error(const std::string &)' signature.