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How to use background thread in swift?
... 8.It gives error as "QOS_CLASS_BACKGROUND" return class and it is of type UInt32 and "dispatch_get_global_queue" requires 1st parameter as int so type error is coming.
– Zalak Patel
Oct 29 '14 at 12:43
...
How to generate random SHA1 hash to use as ID in node.js?
...o this client side in modern browsers, if you'd like
// str byteToHex(uint8 byte)
// converts a single byte to a hex string
function byteToHex(byte) {
return ('0' + byte.toString(16)).slice(-2);
}
// str generateId(int len);
// len - must be an even number (default: 40)
function...
Measure elapsed time in Swift
...tart.uptimeNanoseconds // <<<<< Difference in nano seconds (UInt64)
let timeInterval = Double(nanoTime) / 1_000_000_000 // Technically could overflow for long running tests
print("Time to evaluate problem \(problemNumber): \(timeInterval) seconds")
return theAnswer
}
Ol...
Can a C++ enum class have methods?
...u were hoping that the code looks something like this:
enum class Fruit : uint8_t
{
Apple,
Pear,
Banana,
Strawberry,
bool IsYellow() { return this == Banana; }
};
...
But of course, it doesn't work, because enums can't have methods (and 'this' doesn't mean anything in the above conte...
Changing specific text's color using NSMutableAttributedString in Swift
...utedStringWithColor(_ strings: [String], color: UIColor, characterSpacing: UInt? = nil) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: self)
for string in strings {
let range = (self as NSString).range(of: string)
attribute...
How to force NSLocalizedString to use a specific language
...age:nil];
Enjoy...
For those who need a Swift version:
var bundleKey: UInt8 = 0
class AnyLanguageBundle: Bundle {
override func localizedString(forKey key: String,
value: String?,
table tableName: String?) -> String {
...
What is Type-safe?
...Just as easily could be a char[4] and an int, but the more common issue is uint vs. int).
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A type unsafe language allows the programmer to reference a pro...
c/c++如何判断指针无效？如NULL,0xcccccccc,0xfeeefeee,野指针等 - C/C++ -...
...BadWritePtr, IsBadReadPtr
BOOL AFXAPI AfxIsValidAddress(const void* lp, UINT nBytes,
BOOL bReadWrite /* = TRUE */)
{
// simple version using Win-32 APIs for pointer validation.
return (lp != NULL && !IsBadReadPtr(lp, nBytes) &&
(!bReadWrite || !IsBadWritePtr((LPVOID)lp, nBytes)));
}
指针...
Selenium c# Webdriver: Wait Until Element is Present
... public static IWebElement FindElement(this ISearchContext context, By by, uint timeout, bool displayed=false)
{
var wait = new DefaultWait<ISearchContext>(context);
wait.Timeout = TimeSpan.FromSeconds(timeout);
wait.IgnoreExceptionTypes(typeof(NoSuchElementExceptio...
Difference between == and ===
...!= operators test for value equality for number values (e.g., NSInteger, NSUInteger, int, in Objective-C and Int, UInt, etc. in Swift). For objects (NSObject/NSNumber and subclasses in Objective-C and reference types in Swift), == and != test that the objects/reference types are the same identical t...