include <string>;
class options
{
bool --help {"Print usage information and exit."};
std::string --greeting = "Hello"
{
"<text>",
"Use <text> as a greeting phrase instead of the default \"Hello\"."
};
unsigned int --exclamations = 1
{
"<num>",
"Print <num> exclamation marks instead of 1 by default."
};
};