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A NullReferenceException exception is thrown by a method that is passed null . Some methods validate the arguments that are passed to them. If they do and one of the arguments is null , the method throws an System.
Yes. If you create a new Exception() and don't throw it, every property except Data and Message will be null.
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++.
Exceptions provide the means to separate the details of what to do when something out of the ordinary happens from the main logic of a program. In traditional programming, error detection, reporting, and handling often lead to confusing spaghetti code.
Can a caught std::exception ever have what() being NULL?
Is the checking for e.what() below overhead?
//...
}
catch (const std::exception& e)
{
std::string error;
if(e.what())
error = e.what();
}
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