If I have a try/catch block with returns inside it, will the finally block be called? For example: try { something(); return success; } catch (Exception e) { return failure; } finally { System.out.println "i don't know if this will get printed out." } I know I can just type this in an se...
Does C++ support 'finally' blocks? What is the RAII idiom? What is the difference between C++'s RAII idiom and C#'s 'using' statement? ...
I have a suspicion that I'm using the finally block incorrectly, and that I don't understand the fundamentals of its purpose... function myFunc() { try { if (true) { throw "An error"; } } catch (e) { alert (e); return false; } finally { return true...
Since there is no finally in C++ you have to use the RAII design pattern instead, if you want your code to be exception safe. One way to do this is by using the destructor of a local class like this: void foo() { struct Finally { ~Finally() { /* cleanup code */ } } finalizer(); // ...code that might throw an exceptio...
Bjarne Stroustrup writes in his C++ Style and Technique FAQ, emphasis mine: Because C++ supports an alternative that is almost always better: The "resource acquisition is initialization" technique (TC++PL3 section 14.4). The basic idea is to represent a resource by a local object, so that the local object's destructor will release th...
Is this a good way to implement a Finally-like behavior in standard C++? (Without special pointers) class Exception : public Exception { public: virtual bool isException() { return true; } }; class NoException : public Exception { public: bool isException() { return false; } }; Object *myObject = 0; try { // OBJECT CREATIO...
Is there any condition where finally might not run in java? Thanks. ...
Is there an elegant way to handle exceptions that are thrown in the a finally block? For example: try { // Use the resource. } catch( Exception ex ) { // Problem with the resource. } finally { try{ resource.close(); } catch( Exception ex ) { // Could not close the resource? } } How do you avoid the try/catc...
Been doing Java for number of years so haven't been tracking C++. Has finally clause been added to C++ exception handling in the language definition? Is there a favored idiom that mimics Java's try/finally? Am also bothered that C++ doesn't have an ultimate super type for all possible exceptions that could be thrown - like Java's Throw...
I'm a Java rookie and I was wondering, if I have the following typical Java code public class MyApp { public static void main(String[] args) { try { // do stuff } catch { // handle errors } finally { // clean up connections etc. } } } does the JVM guarantee that the finally block will always be ru...
I found the following behavior at least weird: def errors(): try: ErrorErrorError finally: return 10 print errors() # prints: 10 # It should raise: NameError: name 'ErrorErrorError' is not defined The exception disappears when you use return inside a finally clause. Is that a bug? Is that documented anywhere? ...
Edit: I have looked at the answers code: NONE of them do what I want (I've checked). It would seem that there is no way to do what I want in native c#. I guess that's not a disaster just a shame given that .NET does support it (see accepted answer). Thanks all. I have c# code (part of a test framework that will never be run except un...
Note: this is not a duplicate of Jeff's question. That question asked "Is an equivalent?" I know there isn't, and I want to know why! The reason I ask is that I've only just become clear on how important it is, and the conclusion seems very strange to me. The Exception Handling block of Microsoft's Enterprise Library advises us to use...
I've been helping a colleague debug some strange behavior in their code. The following sample illustrates this: static void Main(string[] args) { string answer = Sample(); Console.WriteLine(answer); } public static string Sample() { string returnValue = "abc"; try { return returnValue; } catch (E...
Hello, This is the code I use to setup my TCP server internal void Initialize(int port,string IP) { IPEndPoint _Point = new IPEndPoint(IPAddress.Parse(IP), port); Socket _Accpt = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); try { _Accpt.Bind(_Point); ...
Take this code: using System; namespace OddThrow { class Program { static void Main(string[] args) { try { throw new Exception("Exception!"); } finally { System.Threading.Thread.Sleep(2500); Console.Error....
I've run ildasm to find that this: using(Simple simp = new Simple()) { Console.WriteLine("here"); } generates IL code that is equivalent to this: Simple simp = new Simple(); try { Console.WriteLine("here"); } finally { if(simp != null) { simp.Dispose(); ...
I have a situation where I want certain code to be executed no matter what happens, but I need exceptions to also be passed on up the stack to be handled later. Is the following: try { // code } finally { // code that must run } going to just ignore any exceptions, or will it pass them on up? My testing seems to show that they st...
I was trying to come up with obscure test cases for an alternative open-source JVM I am helping with (Avian) when I came across an interesting bit of code, and I was surprised that it didn't compile: public class Test { public static int test1() { int a; try { a = 1; return a; // this is fine ...
Consider, static void Main(string[] args) { Console.WriteLine(fun()); } static int fun() { int i = 0; try { i = 1; return i; } catch (Exception ex) { i = 2; ...