Is there a performance diff using CGFloat with or without postfix .f in Objective-C
Should I be writing CGFloat values with postfix
f or not?
CGFloat fValue = 1.2;
CGFloat fValue = 1.2f;
I know that this postfix define a float value. But is it necessary, does it make sense, are there any performance differences between using those two or is this just visual presentation so you can quickly define value type (e.g. float in this case)?
- Creating Thumbnail from Video - Improving Speed Performance - AVAsset - iPhone
- Swift performance using NSXMLParser
- Measuring the UITableView Scrolling Performance - iphone
- Performance difference between dot notation versus method call in Objective-C
- Bluetooth Low Energy - updating a characteristic value repeatedly
- Are there any concrete study of the performance impact of using ARC?
2 Solutions Collect From Internet About “Is there a performance diff using CGFloat with or without postfix .f in Objective-C”
1.2 is a
double; i.e. 64-bit double-precision floating point number.
1.2f is a
float; i.e. 32-bit single-precision floating point number.
In terms of performance, it doesn’t matter as the compiler will convert literals from
float as necessary. When assigning floating-point numbers from functions, however, you will most likely need to cast to avoid a compiler warning.
The basic difference is as :
1.0 or 1. is a double constant
1.0f is a float constant
Without a suffix, a literal with a decimal in it (123.0) will be treated as a double-precision floating-point number.
If you assign or pass that to a single-precision variable or parameter, the compiler will (should) issue a warning. Appending
f tells the compiler you want the literal to be treated as a single-precision floating-point number.
- Reading Firebase Auth Error Thrown (Firebase 3.x and Swift)
- Display video inside the Uiwebview not in device full screen
- Changing text color of datepicker
- NSURLSession “HTTP load failed kCFStreamErrorDomainSSL, -9813 ; Self signing certificate
- Circumvent screenshot for iOS 4
- How cell swipe on clicking a button
- Flurry Analytics, Basic Analytics Issues
- UITextField minimum fontsize
- How to check if an NSString contains one of the NSStrings in an NSArray?
- How to use UIEdgeInsets property in Button in iphone
- Xcode GM: no swift language for OS X command line tool project?
- Difference between + and – methods in Objective-c
- Can iOS receive broadcasts like Android?
- Xcode cannot run using the selected device after upgrade to Xcode 5.0
- How to create project templates in Xcode 4