Enhancements to allocatable arrays

Language enhancement
25

I have written some (limited) demonstration code to show how it could work. The code is non-standard and relies on the C interoperability to manipulate the array descriptors in C.

For instance, the element-by-element appending operation

integer, allocatable :: a(:)
allocate( a(0) )
do i = 1, n
   k = <whatever>
   a = [a, k]
end do

is dramatically faster with

integer, allocatable :: a(:)
do i = 1, n
   k = <whatever>
   call resize(a,extend=k)
end do

This would be quite easy to implement in the compilers, I think…

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