[cfe-dev] [libc++] ios_base and exceptions

[Marshall Clow]

On Apr 22, 2014, at 8:23 AM, Ben Pope <benpope81 at gmail.com> wrote:

> I think I've found a bug, what's the expected output of this program?

I think you’re right, Ben.
Please file a bug at:
	http://www.llvm.org/bugs

Feel free to assign it to me.

— Marshall

> 
> #include <sstream>
> #include <iostream>
> 
> void test_iostate(std::ios_base::iostate state)
> {
>   char c;
>   std::stringstream ss;
>   try
>   {
>      ss.exceptions(state);
>      ss >> c;
>      std::cout << "Didn't throw\n";
>   }
>   catch(std::ios_base::failure const& ex)
>   {
>      std::cout << "Threw: " << ex.what() << "\n";
>   }
> }
> int main()
> {
>   test_iostate(std::ios_base::eofbit);
>   test_iostate(std::ios_base::badbit);
>   test_iostate(std::ios_base::failbit);
>   test_iostate(std::ios_base::eofbit|std::ios_base::badbit);
>   test_iostate(std::ios_base::eofbit|std::ios_base::failbit);
>   test_iostate(std::ios_base::badbit|std::ios_base::failbit);
> test_iostate(std::ios_base::eofbit|std::ios_base::badbit|std::ios_base::failbit);
> }
> 
> 
> $ clang++ io_fail.cpp -stdlib=libc++ -lc++abi
> $ ./a.out
> Didn't throw
> Didn't throw
> Didn't throw
> Threw: ios_base::clear: unspecified iostream_category error
> Didn't throw
> Threw: ios_base::clear: unspecified iostream_category error
> Threw: ios_base::clear: unspecified iostream_category error
> 
> $ clang++ io_fail.cpp
> $ ./a.out
> Threw: basic_ios::clear
> Didn't throw
> Threw: basic_ios::clear
> Threw: basic_ios::clear
> Threw: basic_ios::clear
> Threw: basic_ios::clear
> Threw: basic_ios::clear
> 
> Ben
> 
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