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swift reflection causes impossible nil value for any


swift reflection causes impossible nil value for any

By : John Henning
Date : November 22 2020, 02:59 PM
wish of those help I'm trying to use swift reflection to check for changes in objects so I can send only changed properties up to the server. Some of my properties are optional. To compare those values, I need to unwrap them but, of course, you can ONLY unwrap actual values, not nil values. So, I need to check if one of the values is nil before I compare them. , Thats look like some sort of bug. Look at that
code :
let x = childMirror.value == nil ? "Nil" : "Not Nil" //dont compile.

let y = { (value:Any?) in
   return value == nil ? "Nil" : "Not Nil"
}

let z = y(childMirror.value) //compile, but doesn't evaluate.
func getValue(unknownValue:Any) -> Any {

    let value = Mirror(reflecting: unknownValue)
    if value.displayStyle != .Optional || value.children.count != 0 {
        return "Not Nil"
    } else {
        return "Nil"
    }
}


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Impossible to set AWSAPIGatewayClient configuration in Swift 3?

Impossible to set AWSAPIGatewayClient configuration in Swift 3?


By : Will Luttrell
Date : March 29 2020, 07:55 AM
With these it helps The API Gateway generated SDK for Swift also provides with a file named AWSApiGatewayBridge.h in the package which is imported via the bridging header of your app(showed in Bridging_Header.h).
The Generated SDK won't work without AWSApiGatewayBridge.h imported in your project via the objective c bridging header.
PHP Reflection Method > Returning Reference Impossible

PHP Reflection Method > Returning Reference Impossible


By : Sankar Ganesh Arumug
Date : March 29 2020, 07:55 AM
wish of those help tl;dr
Use ReflectionMethod::getClosure() to retrieve a closure representing the method. If that closure is invoked directly, it will correctly return a reference, if that was the behaviour of the original method.
code :
<?php

function &reflectionInvokeByRef($object, $method, $args = array())
{
    $reflection = new \ReflectionMethod($object, $method);
    $reflection->setAccessible(true);
    $closure = $reflection->getClosure($object);
    $result = &$closure(...$args);

    return $result;
}

$a = new A();
$items = &reflectionInvokeByRef($a, '_getItemStorage');

$items[] = 'yolo';
var_dump($a);
object(A)#1 (1) {
  ["items":protected]=> &array(1) {
    [0]=> string(4) "yolo"
  }
}
<?php

function &reflectionInvokeByRef($object, $method, $args = array())
{
    $reflection = new \ReflectionMethod($object, $method);
    $reflection->setAccessible(true);
    $args = array_pad($args, 10, null);
    $closure = $reflection->getClosure($object);
    $result = &$closure($args[0], $args[1], $args[2], $args[3], $args[4], $args[5],
        $args[6], $args[7], $args[8], $args[9]);

    return $result;
}

$a = new A();
$items = &reflectionInvokeByRef($a, '_getItemStorage', array('some', 'args'));

$items[] = 'yolo';
var_dump($a);
object(A)#1 (1) {
  ["items":protected]=> &array(1) {
    [0]=> string(4) "yolo"
  }
}
Swift Impossible Type Inference

Swift Impossible Type Inference


By : Neil Kindness
Date : March 29 2020, 07:55 AM
will be helpful for those in need I am trying to load a file from my app bundle in Swift 3, and I came across a weird situation with the Swift type inferencing. If I use the following code, I get an error on the third line that says Value of optional type "String?" not unwrapped. , In Swift, Optional chaining like:
code :
let path:String = url2?.path!
let path:String = url2 != nil ? url2!.path!
                              : nil
let url = Bundle.main.bundleURL
let url2 = url.appendingPathComponent("foo.txt")
let path:String = url2.path
Impossible to use classes in swift

Impossible to use classes in swift


By : Bobby Holzman
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further i have 2 files ProductTableViewCotrollers.swift and Product.swift , Set property in one of the ViewController lifecycle methods
code :
class TableViewController: UITableViewController {

let p1 = Product()
let p2 = Product()
let p3 = Product()
let p4 = Product()


override func viewDidLoad() {
    super.viewDidLoad()

p1.name = ""



}
Reflection and refraction impossible without recursive ray tracing?

Reflection and refraction impossible without recursive ray tracing?


By : rob25
Date : March 29 2020, 07:55 AM
may help you . I manage to convert back-raytracing to iterative process suitable for GLSL with the method suggested in my comment. It is far from optimized and I do not have all the physical stuff implemented (no Snell's law etc ...) yet but as a proof of concept it works already. I do all the stuff in fragment shader and CPU side code just send the uniforms constants and scene in form of 32 bit non-clamped float texture GL_LUMINANCE32F_ARB The rendering is just single QUAD covering whole screen.
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