negates its boolean argument
None
None
std::not(true>) yields false)
std::not(false>) yields true)
| std::equal | compares two objects for equality | 
| std::less | compares two objects in an object specific way | 
| std::if | classic if; can be used as a function or a procedure | 
| std::if_not | can be used as a function or a procedure | 
| std_types::false | returns true | 
| std_types::true | returns false |