Re: initializing an array of user-defined data types

Bart Vandewoestyne wrote:
I have a rank 2 array of a user-defined type as follows:

type(piece), dimension(:,:), allocatable, private :: board

After allocating it, I want to initialize it so that after
initialization, I can check whether board(i,j) contains a piece
or not.

I've tried things like

board = NULL

... assign some pieces to board positions and leave others empty ...

if (board(i,j) == NULL) then
... do something ...
end if


but that doesn't seem to work.

What is the proper way to do this?

What about this sort of thing:


type :: piece
integer :: i = -1
real :: x = -999.99
end type piece
...
type(piece), dimension(:,:), allocatable :: board
...
allocate(board(10,10))
...
if ( board(i,j) == piece(-1,-999.99) ) then
board(i,j) = piece(i,real(j))
... do something else ...
end if


??


Maybe you could even do

type(piece), parameter :: mynull = piece(-1,-999.99)
....
if ( board(i,j) == mynull ) then
... do something ...
end if

but I've never tried that and have no idea if it's allowed syntax. Easy to test, though.


cheers,

paulv
.

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