Throw new Exceptions (throw-keyword)

In C++, the throw keyword is used to signal an error or exceptional condition by throwing an exception. When an exception is thrown using throw, it is propagated up the call stack, where it can be caught and handled by a try–catch block. The throw mechanism allows for separating error handling from regular code flow, which improves readability and robustness in complex applications.

How throw Works

The basic structure for throwing an exception using the throw keyword is:

throw exceptionObject;

Here, exceptionObject can be an instance of any type, including built-in types (like integers or strings) or user-defined types (such as custom exception classes).