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Method `!()
- Method
`!
int(0..1) `!(object|function arg)
int(1..1) `!(int(0..0) arg)
int(0..0) `!(mixed arg) - Description
Logical not.
Every expression with the ! operator becomes a call to
this function, i.e. !a is the same as
predef::`!(a).
It's also used when necessary to test truth on objects, i.e. in
a statement if (o) ... where o is an object, the
test becomes the equivalent of !!o so that any
lfun::`!() the object might have gets called.
- Returns
If arg is an object that implements lfun::`!() , that function
will be called.
If arg is 0 (zero), a destructed object, or a function in a
destructed object, 1 will be returned.
Otherwise 0 (zero) will be returned.
- Note
No float is considered false, not even 0.0.
- See also
`==() , `!=() , lfun::`!()
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