Re: [Boost-users] [array] VC++ 7.1 bug and a proposed fix

24 Jul 2006

      AlisdairM wrote:
...
Johan Råde wrote:
...
If I modify the array class by adding a non-templatized
assignment operator, as follows,
then the code does compile.
---------------------------------------------------------
namespace boost {
     template
     class array {
         ...
         array& operator=(const array& rhs) {
             std::copy(rhs.begin(), rhs.end(), begin());
             return *this;
         }
         ...
     };
}
----------------------------------------------------------
So I propose that this assignment operator is added,
as a VC++ 7.1 bug workaround, to the array class.
The problem with that workaround is that the array template would no
longer produce aggregate types, and we would lose the ability to use
brace initialization:
std::tr1::array< int, 4 > x = { 0, 1, 2, 3 };
Are you sure? An aggregate can not have user defined constructors,
but I believe user defined assignment operators ar OK.

I tested with VC++ 7.1, and there my fix can be combined with aggregate 
initialization.
(If I add a constructor though, then aggregate initialization does not 
work with VC++ 7.1.)

So I think my fix works.
...
i/ does it fail on other compilers?
ii/ Is it a very specific failure with pointer-to-member, or the first
hint of a more general issue that should be solved?
I have no idea. The error only seems to pop up in fairly complex 
situations with templates and pointer-to-members.