Re: Clang & C++ exceptions in destructors
Re: Clang & C++ exceptions in destructors
- Subject: Re: Clang & C++ exceptions in destructors
- From: Jean-Daniel Dupas <email@hidden>
- Date: Tue, 08 Jan 2013 14:50:22 +0100
Yep.
Changing from C++11 to C++98 change the behavior.
It terminates in C++11 mode, and throw the exception in C++98.
That said, I can't tell if this is expected or not.
Le 8 janv. 2013 à 12:07, Jesper Papmehl-Dufay <email@hidden> a écrit :
> Interesting! I am using Xcode 4.5.2 too. Maybe we have different compiler settings? Enclosed is the complete project that reproduces the problem for me.
>
> Thanks!
> /Jesper
> <throw.zip>
>
>
> 8 jan 2013 kl. 12.01 skrev Jean-Daniel Dupas:
>
>>
>> Le 8 janv. 2013 à 11:27, Jesper Papmehl-Dufay <email@hidden> a écrit :
>>
>>> It seems clang (or the “Apple LLVM Compiler”) doesn’t like it when I throw exceptions from a C++ destructor. Is this intentional, or should I report it as a bug?
>>> (I aware that in general, throwing from a destructor is a very bad idea, I’m only doing it in very specific cases. For example, I know that my destructor is not called during stack unwinding due to another exception.)
>>>
>>> For example, the following program will terminate with a “terminate called without an active exception” message when the destructor throws std::exception (testing using Xcode 4.5.2 on Mac OS X 10.7.5):
>>>
>>>
>>> #include <stdexcept>
>>>
>>> class CThrowInDestructor {
>>> public: CThrowInDestructor() {}
>>> public: ~CThrowInDestructor() {
>>> throw std::exception();
>>> }
>>> };
>>>
>>> int main(int argc, const char * argv[]) {
>>> CThrowInDestructor* instance = new CThrowInDestructor;
>>> try {
>>> delete instance;
>>> instance = NULL;
>>> }
>>> catch (...) {
>>> }
>>> return 0;
>>> }
>>>
>>>
>>> If I switch compiler to LLVM GCC 4.2, the program exits normally, so it seems the problem is specific to clang.
>>
>>
>> What version of Xcode are you using ? With Xcode 4.5.2, it behaves as expected.
>> I added a print statement in the catch clause in your sample, and it is properly printed before the program exits normally.
>>
>> -- Jean-Daniel
>>
>>
>>
>>
>>
>
-- Jean-Daniel
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