Problem with dynamic_cast & exceptions using GCC 4?
Problem with dynamic_cast & exceptions using GCC 4?
- Subject: Problem with dynamic_cast & exceptions using GCC 4?
- From: Jesper Papmehl <email@hidden>
- Date: Mon, 25 Jul 2005 19:07:48 +0200
Hi!
I am have trouble getting dynamic_cast to do the right thing when
compiling with GCC 4.
We use a hierarchy of exceptions (mainly the standard ones in
stdexcept) and in various places in out code, we use dynamic_cast to
convert between exceptions and error codes. We do this by catch:ing
std::exception references, and then try to dynamic_cast the caught
exception to the various exception classes to see which one it is.
This works fine in CodeWarrior and Visual Studio, and also in Xcode
when using GCC 3.3, but not when using GCC 4.
For example, when running the following program:
#include <iostream>
#include <stdexcept>
int main(int argc, char* const argv[]) {
try {
throw std::invalid_argument("");
}
catch (const std::exception& e) {
if (dynamic_cast<const std::invalid_argument*>(&e) != NULL) {
std::cout << "got invalid_argument" << std::endl;
}
else if (dynamic_cast<const std::logic_error*>(&e) != NULL) {
std::cout << "got logic_error" << std::endl;
}
else {
std::cout << "got something else" << std::endl;
}
}
return 0;
}
I get a logic_error instead of an invalid_argument when using GCC 4.
I am using Xcode 2.1 and a freshly created C++ Tool project with the
default settings. (C++ exceptions and RTTI are turned on.)
If I change the compiler version from GCC 4 to GCC 3.3, I get an
invalid_argument instead, which is what I expect.
Does anyone have any idea what is going on? Do I have the wrong
expectation about how this is supposed to work? Or is it maybe a GCC
bug?
TIA
/Jesper Papmehl
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