Note: information on this page refers to Ceylon 1.0, not to the current release.
-=
(subtract assign) operator
The right-associative, binary infix -=
operator decrements it's left-hand operand
by the amount given by its right-hand operand.
Usage
variable Integer num = 4;
num -= 1; // decrement num by 1
num -= num; // decrement num by 3
Description
Definition
The -=
operator is defined as follows:
lhs = lhs.minus(rhs)
except that lhs
is evaluated only once.
See the language specification for more details.
Polymorphism
The -=
operator is polymorphic.
The definition of the -=
operator depends
on the Numeric
interface.
Type
The result type of the -=
operator is the same as the type of its right hand operand.
See also
- arithmetic operators in the language specification
- operator precedence in the language specification
- Operator polymorphism and Numeric operator semantics in the Tour of Ceylon