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Re: Throwing std::ios_base::failure on formatted input with gcc 6.2
- From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
- To: Edward Diener <eldlistmailingz at tropicsoft dot com>
- Cc: gcc-help <gcc-help at gcc dot gnu dot org>
- Date: Wed, 26 Oct 2016 15:57:18 +0100
- Subject: Re: Throwing std::ios_base::failure on formatted input with gcc 6.2
- Authentication-results: sourceware.org; auth=none
- References: <nuq4vs$4c5$1@blaine.gmane.org> <CAH6eHdRAhZ0Vsmt1VrpUH_RTFTtgZNYmPOoAMmxA0epQZVGdPw@mail.gmail.com> <CAH6eHdQDp2-j_+HYaa+fBFCB5ZcwSGT1K1fiid6o_gb=aDF4HQ@mail.gmail.com> <nuqbsl$9bu$1@blaine.gmane.org>
On 26 October 2016 at 14:42, Edward Diener wrote:
> I am missing the syntactical difference between the two. There is
> 'std::ios_base::failure' and how do you specify the other one ? Your
> notation of 'std::ios_base::[abi:__cxx11]failure' I do not understand.
>
It comes from the abi_tag attribute documented at
https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html
namespace std {
struct ios_base {
struct __attribute__((abi__tag__("cxx11"))) failure { };
};
}
I got the demangled name slightly wrong, the attribute goes at the end:
#include <iostream>
int main()
{
throw std::ios_base::failure("");
}
terminate called after throwing an instance of
'std::ios_base::failure[abi:cxx11]'
what(): : iostream error
Aborted (core dumped)