Hi Nitin,
>Static initializations of a flexible array works with gcc but not with g++ . is this by design?
Yes, this is by design. C++ does not have flexible arrays (or what I've heard called "stretchy arrays" or "stretchy buffers"). C++ has STL std::vector.
The stretchy buffer is a bad trick -- it's not portable, and may cause certain optimizations to fail is a bad way.
(I'm not sure if it is even legit C code. Maybe it is with C99. I dunno.)
A suggestion is to do the reverse: specify the structure with the array given the maximum length, and allow allocations of less-than-maximum when used off the heap. (There are caveats with this approach as well.)
struct flex_array_1000
{
int A;
int Data[1000];
};Alternatively, you can use template structs to provide more exacting "hard-coded" arrays.
template <int Count>
struct flex_array
{
int A;
int Data[Count];
};...and you can have the struct derived from a common base class if you need some sort of polymorphism.
HTH,
--Eljay
