SubtractAssignmentOperation.ceylon
"A subtract assignment operation (`-=`).
Right-associative.
Examples:
countdown -= \\iΔt"
see (`class DifferenceOperation`)
shared class SubtractAssignmentOperation(target, subtrahend)
extends ArithmeticAssignmentOperation() {
"The target expression and minuend."
shared ThenElseExpression target;
"The subtrahend."
shared AssigningExpression subtrahend;
"The target expression and minuend."
see (`value target`)
shared actual ThenElseExpression leftOperand = target;
"The subtrahend."
see (`value subtrahend`)
shared actual AssigningExpression rightOperand = subtrahend;
shared actual [ThenElseExpression, AssigningExpression] children = [leftOperand, rightOperand];
operator = "-=";
shared actual Result transform<out Result>(Transformer<Result> transformer)
=> transformer.transformSubtractAssignmentOperation(this);
shared actual Boolean equals(Object that) {
if (is SubtractAssignmentOperation that) {
return leftOperand == that.leftOperand && rightOperand == that.rightOperand;
} else {
return false;
}
}
shared actual Integer hash
=> 31 * (leftOperand.hash + 31 * rightOperand.hash);
shared SubtractAssignmentOperation copy(ThenElseExpression leftOperand = this.leftOperand, AssigningExpression rightOperand = this.rightOperand) {
value ret = SubtractAssignmentOperation(leftOperand, rightOperand);
copyExtraInfoTo(ret);
return ret;
}
}