4219         std::string placeholder; // Only value if boundField takes an arg  member
4222             return !placeholder.empty();  in takesArg()
4256             using CommonArgProperties<ConfigT>::placeholder; // !TBD
4281                 if( !placeholder.empty() )  in commands()
4282                     oss << " <" << placeholder << ">";  in commands()
4317             void bind( M C::* field, std::string const& placeholder ) {  in bind()  argument
4319                 m_arg->placeholder = placeholder;  in bind()
4329             void bind( void (C::* unaryMethod)( M ), std::string const& placeholder ) {  in bind()  argument
4331                 m_arg->placeholder = placeholder;  in bind()
4354             void bind( void (* binaryFunction)( C&, T ), std::string const& placeholder ) {  in bind()  argument
4356                 m_arg->placeholder = placeholder;  in bind()
4476                     os << "<" << it->second.placeholder << ">";  in argSynopsis()
4478                     os << "<" << m_floatingArg->placeholder << ">";  in argSynopsis()
4486                 os << "[<" << m_floatingArg->placeholder << "> ...]";  in argSynopsis()