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Is it ok to just call throw; from constructor if something goes awry, and you have no idea how to recover?
The idea is to let the app crash with a dump, as the state is unknown. Or should you always specify an argument?
From MSDN I only found that it rethrows if there is no argument, but no idea what happens if there is no initial exception to rethrow.
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When an exception is thrown using the throw keyword, the flow of execution of the program is stopped and the control is transferred to the nearest enclosing try-catch block that matches the type of exception thrown. If no such match is found, the default exception handler terminates the program.
The throw keyword throws an exception when a problem is detected, which lets us create a custom error. The catch statement allows you to define a block of code to be executed, if an error occurs in the try block.
In C++ throw; when executed inside a catch block rethrows the currently caught exception outside the block.
An exception in C++ is thrown by using the throw keyword from inside the try block. The throw keyword allows the programmer to define custom exceptions. Exception handlers in C++ are declared with the catch keyword, which is placed immediately after the try block.
If there's no exception currently being processed throw; will lead to terminate() being called immediately and that will end your program abnormally. That is not very convenient - you'll have less information about what happened compared to throwing a meaningful exception. You could have thrown a meaningful exception, catch it at the top level (like main()), write some diagnostics and then end the program.
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No. throw; is a special syntax that re-throws current exception. It only makes sense inside catch blocks (or code called from one) to continue propagating the exception.
Just use:
#include <stdexcept>
...
throw std::runtime_error("some description");
or even just
throw "some description";
but the later is uglier to handle and just generally frowned upon.
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