[patch] Make vector::at() assertion message more useful

[Paolo Carlini]

Hi,

Paul Pluzhnikov <ppluzhnikov@google.com> ha scritto: __throw_out_of_range(__N("vector::_M_range_check"));
>+	  {
>+	    char __s[256];
>+	    __builtin_snprintf(__s, sizeof(__s),
>+			       __N("vector::_M_range_check: %zu >= %zu"),
>+			       __n, this->size());
>+	    __throw_out_of_range(__s);
>+	  }

The idea makes sense, but while we are at it I think the message could be more clear, say what the two numbers are. Also, I don't think we can unconditionally call snprintf, it's C99 and supported targets lack it. Maybe with some libiberty magic? I don't think such magic automagically triggers when __builtin_snprintf is expanded, or does it? Please investigate that.

Thanks,
Paolo