code/__DEFINES/is_helpers.dm

IN_GIVEN_RANGE	Within given range, but not counting z-levels
IS_WEAKREF_OF	Checks if potential_weakref is a weakref of thing.
isclosedturf	Not really closed, but the meaning is the same.
istrue	in some situations we can't rely on dynamic typing and use if(statement)

Define Details

Within given range, but not counting z-levels

Checks if potential_weakref is a weakref of thing.

Not really closed, but the meaning is the same.

in some situations we can't rely on dynamic typing and use if(statement)