C++ Standard Question

[Marc Glisse]

On Thu, 22 Jan 2015, Joel Sherrill wrote:

> I think this is a glibc issue but since this method is defined in the C++
> standards, I thought there were plenty of language lawyers here. :)

s/glibc/libstdc++/ and they have their own ML.

> <strstream>

That's deprecated, isn't it?

>   class strstreambuf : public basic_streambuf<char, char_traits<char> >
>   ISSUE ====> int pcount() const;   <===== ISSUE
>
> My reading of the C++03 and draft C++14 says that the int pcount() method
> in this class is not const. glibc has it const in the glibc shipped with
> Fedora 20
> and CentOS 6.
>
> This is a simple test case:
>
>    #include <strstream>
>
>    int main() {
>        int (std::strstreambuf::*dummy)() = &std::strstreambuf::pcount;
> /*-- pcount is conformant --*/
>        return 0;
>    }
>
> What's the consensus?

The exact signature of member functions is not mandated by the standard, 
implementations are allowed to make the function const if that works (or 
provide both a const and a non-const version). Your code is not guaranteed 
to work. Lambdas usually provide a fine workaround.

-- 
Marc Glisse