On Tue, 2006-09-26 at 21:47 +1000, Jonathan Kelly wrote:
> Hi,
>
> am I right in deducing there are no arrays in felix, despite the
> temptingly titled sections in the tute and ref man? I mean the sort of
> arrays a C/C++ programmer would be thinking of, obviously.
Felix has first class fixed length arrays whose length
is determined by a compile time constant, exactly
the kind in this C:
#define n 1000
struct X { int array[n]; }
It also has C style arrays:
module Carray
{
requires cstdlib;
open C_hack;
fun array_alloc[t]: int -> ptr[t] =
'(?1*)std::malloc(sizeof(?1)*$1)';
....
which are unsafe and can't contain Felix heap pointers.
You can also use STL vector of course, but again
only for C++ data types or pointer-free Felix ones.
We're working on a fixed length array whose length
is determined at construction time dynamically,
called 'varray' in module Varray.
And possibly also a dynamically extensible array
like STL vector.
The difficulty here is that there are LOTS of different
options. Some are hard, for example an extensible
array which moves its storage around: the way STL handles
this is very inefficient. Using mmap/realloc is much faster,
but C++ does not provide a move or 'relocate' method
for objects: realloc doesn't work with copy ctor.
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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