Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Expression	Attribute	Description
`lit(num)`	`Unused`	Generate `num`
`bool_`	`bool`	Generate a boolean
`bool_(b)`	`bool`	Generate `b` as a boolean, if an attribute is supplied it must match
bool_generator< B, Policies >()	`B`	Generate a boolean of type `B`
bool_generator< B, Policies >()(b)	`B`	Generate a boolean `b` as a `B`, if an attribute is supplied it must match