CLLocationCoordinate2D+Equatable.swift

extension CLLocationCoordinate2D: Equatable {}

extension Double {
    func places(p: Double) -> String {
        return NSString(format: "%\(p)f", self)
    }
}

public func ==(lhs: CLLocationCoordinate2D, rhs: CLLocationCoordinate2D) -> Bool {
    return lhs.latitude.places(3) == rhs.latitude.places(3) && lhs.longitude.places(3) == rhs.longitude.places(3)
}

as opposed to this in Objective-C/C

#define kAccuracy (0.0001)

static BOOL doubleCloseTo(double a, double b){
    if (fabs(a-b) < kAccuracy) {
        return YES;
    } else {
        return NO;
    }
}

double expectedLat = 28.418710;
// observedLat comes from a returned CLLocationCoordinate2D

XCAssert(doubleCloseTo(expectedLat, observedLat), @"Latitudes don't match");