The key to using tryCatch is realising that it returns an object. If there was an error inside the tryCatch then this object will inherit from class error. You can test for class inheritance with the function inherit. x <- tryCatch(stop(“Error”), error = function(e) e) class(x) “simpleError” “error” “condition” Edit: What is the meaning of … Read more
PM2 First of all, I would highly recommend installing PM2 for Node.js. PM2 is really great at handling crash and monitoring Node apps as well as load balancing. PM2 immediately starts the Node app whenever it crashes, stops for any reason or even when server restarts. So, if someday even after managing our code, app … Read more
Three points to make here: Firstly, there is little or NO performance penalty in actually having try-catch blocks in your code. This should not be a consideration when trying to avoid having them in your application. The performance hit only comes into play when an exception is thrown. When an exception is thrown in addition … Read more
Instead of guessing, I decided to actually look at the generated code with a small piece of C++ code and a somewhat old Linux install. class MyException { public: MyException() { } ~MyException() { } }; void my_throwing_function(bool throwit) { if (throwit) throw MyException(); } void another_function(); void log(unsigned count); void my_catching_function() { log(0); try … Read more
Wrapping any piece of code in a try/catch block without a good reason is bad practice. In the .NET programming model, exceptions should be reserved for truly exceptional cases or conditions. You should only try to catch exceptions that you can actually do something about. Furthermore, you should should hardly ever catch the base System.Exception … Read more
There’s no such thing as “null pointer exception” in C++. The only exceptions you can catch, is the exceptions explicitly thrown by throw expressions (plus, as Pavel noted, some standard C++ exceptions thrown intrinsically by standard operator new, dynamic_cast etc). There are no other exceptions in C++. Dereferencing null pointers, division by zero etc. does … Read more
I prefer the second one. May as well trap errors relating to the creation of the object as well.
The recommended way is to throw by value and catch by reference. Your example code throws a pointer, which is a bad idea since you would have to manage memory at the catch site. If you really feel you should throw a pointer, use a smart pointer such as shared_ptr. Anyway, Herb Sutter and Alexei … Read more
If the return in the try block is reached, it transfers control to the finally block, and the function eventually returns normally (not a throw). If an exception occurs, but then the code reaches a return from the catch block, control is transferred to the finally block and the function eventually returns normally (not a … Read more
Simple answer: Yes.