Seeming g++-specific "feature deficit"...

[Marc Glisse]

On Fri, 3 Oct 2014, Linda A. Walsh wrote:

> Running > g++ --version
> g++ (SUSE Linux) 4.8.1 20130909 [gcc-4_8-branch revision 202388]
> on a recent kernel, I have the following program that comes up with an error:
>
>
>>  g++ --std=c++11 valA.cc
> valA.cc: In function ‘int main(int, char**)’:
> valA.cc:34:38: error: ‘class std::valarray<std::basic_string<char> >’ has no 
> member named ‘begin’
> for (auto &group:groups) sort(group.begin(), group.end());
>                                     ^
> valA.cc:34:53: error: ‘class std::valarray<std::basic_string<char> >’ has no 
> member named ‘end’
> for (auto &group:groups) sort(group.begin(), group.end());
>                                                    ^
> ----
> What I couldn't figure out was why the valarray had no begin or end members.
>
> It does on the Mac CLANG compiler.
>
> So why not under gnu c++?

Because that is a non-standard function, obviously...

http://en.cppreference.com/w/cpp/numeric/valarray
Look for "begin".
You can write begin(group) but not group.begin().

-- 
Marc Glisse