Decrement by 1, return current

Atomically decrements by one the current value and returns the updated (current) value of the counter. Multiple concurrent client requests are guaranteed to return unique updated value.

Objective-CSwift

- (void)decrementAndGetWithCounterName:(NSString * _Nonnull)counterName responseHandler:^(NSInteger)responseHandler errorHandler:^(Fault * _Nonnull)errorHandler;

func decrementAndGet(counterName: String, responseHandler: ((Int) -> Void)!, errorHandler: ((Fault) -> Void)!)

where:

Argument	Description
counterName	name of the counter to decrement.

Example

Objective-CSwift

[Backendless.shared.counters decrementAndGetWithCounterName:@"MyCounter" responseHandler:^(NSInteger value) {
    NSLog(@"Current value = %li", value);
} errorHandler:^(Fault *fault) {
    NSLog(@"Error: %@", fault.message);
}];

//

id<IAtomic> myCounter = [Backendless.shared.counters ofCounterName:@"MyCounter"];
[myCounter decrementAndGetWithResponseHandler:^(NSInteger value) {
    NSLog(@"Current value = %li", value);
} errorHandler:^(Fault *fault) {
    NSLog(@"Error: %@", fault.message);
}];

Backendless.shared.counters.decrementAndGet(counterName: "MyCounter", responseHandler: { value in
    print("Previous value = \(value)")
}, errorHandler: { fault in
    print("Error: \(fault.message ?? "")")
})

//

let myCounter = Backendless.shared.counters.of(counterName: "MyCounter")
myCounter.decrementAndGet(responseHandler: { value in
    print("Previous value = \(value)")
}, errorHandler: { fault in
    print("Error: \(fault.message ?? "")")
})

Codeless Reference

where:

Argument	Description
counter name	Name of the counter whose value must be decremented.
return current value	When this box is checked, the operation returns the current value of the counter.

Returns the current value of the counter.

Consider the following counter:

The example below decrements the value of the "CarsParkingLot" by 1. This operation returns 9, since the return current value box is checked.

The result of this operation will look as shown below after the Codeless logic runs: