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Swift 2 run code if no exceptions


Swift 2 run code if no exceptions

By : Gokhan Ay
Date : November 22 2020, 02:42 PM
around this issue I am currently writing a Swift 2 application that could throw an error. To prevent it from crashing my code, I am using do-try-catch.
code :
import Foundation

enum Error:ErrorType {
    case Error1
    case Error2
}

func foo() throws -> Void {
    switch arc4random_uniform(3) {
    case 0: throw Error.Error1
    case 1: throw Error.Error2
    default:
        return
    }
}
for i in 0...6 {
    do {
        try foo()
        print("no error code")
        // you can put here as much
        // code, as you need
        let i = random() % 100
        let j = random() % 100
        let k = i + j
        print("\(i) + \(j) = \(k)")
    } catch Error.Error1 {
        print("error 1 code")
    } catch Error.Error2 {
        print("error 2 code")
    }
}
no error code
83 + 86 = 169
error 1 code
error 2 code
error 1 code
no error code
77 + 15 = 92
error 2 code
no error code
93 + 35 = 128
Run and Ceck a function that could throw for All errors
If the function does not throw an error
Do this code
...
If error1
Do this code
If error2
Do this code


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In what ways do C++ exceptions slow down code when there are no exceptions thown?

In what ways do C++ exceptions slow down code when there are no exceptions thown?


By : Mihia Mihiax
Date : March 29 2020, 07:55 AM
Does that help There is a cost associated with exception handling on some platforms and with some compilers.
Namely, Visual Studio, when building a 32-bit target, will register a handler in every function that has local variables with non-trivial destructor. Basically, it sets up a try/finally handler.
Test code with Exceptions and with no exceptions at same time (JAVA)

Test code with Exceptions and with no exceptions at same time (JAVA)


By : daf
Date : March 29 2020, 07:55 AM
With these it helps Even if you ignore the "one test, one assertion" purist perspective, I think most people agree you should split tests that involve error conditions from tests that prove normal behaviour.
If you want to test multiple error conditions within one test (or if you're really keen on continuing with your plan), you can use this pattern:
code :
try {
  // something that should cause an exception
  fail("Exception expected");
} catch (ExactlyTheRightException e) {
  // ignored
}
Why is catching checked exceptions allowed for code that does not throw exceptions?

Why is catching checked exceptions allowed for code that does not throw exceptions?


By : Girai Kaku
Date : March 29 2020, 07:55 AM
it helps some times Quoting the Java Language Specification, §11.2.3:
code :
try {
    System.out.println("hello");
} catch (IOException e) {  // compilation error
    e.printStackTrace();
}
Catch All Exceptions code in the Main is not catching events exceptions

Catch All Exceptions code in the Main is not catching events exceptions


By : Fan Jiang
Date : March 29 2020, 07:55 AM
Does that help The exception is not caught because it is not thrown by the code inside your try-catch block. The button click is not handled by this code, it is handled by an ActionListener. The code in the listener is throwing the exception.
The invokeLater method simply adds a Runnable to the queue, the act of adding that Runnable is successful and does not therefore generate an exception. See this page.
code :
public void actionPerformed(ActionEvent e) {
    try{
        // your logic here
    }
    catch(Exception e){
        // do something to handle the exception here
    }
}
Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
    public void uncaughtException(Thread t, Throwable e) {
        System.out.println("Caught exception: "+e.getClass().getName());
        // do something else useful here
    }
});
What happens when code that throws exceptions is linked against a library compiled with -fno-exceptions?

What happens when code that throws exceptions is linked against a library compiled with -fno-exceptions?


By : Tijmen Roberti
Date : March 29 2020, 07:55 AM
Hope that helps As the linked question points out, GCC needs to allow -fno-exceptions and -fexceptions to co-exist, in order to link C and C++.
On a more theoretical level, the exception problem is closely related to the call graph of a program. This is a directed graph (caller/callee) but it can be cyclic, and there can be multiple edges between nodes. Now each function/node can be compiled with or without exceptions. We can define a safe program as a program in which no "with exceptions" node is reachable from a "without exceptions" node.
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