Michael Van Canneyt via fpc-pascal wrote:
On Sat, 14 Dec 2024, Adriaan van Os via fpc-pascal wrote:
Macpascal and Iso pascal have procedural parameters, e.g.
function A( function B: double): double;
Is there a $modeswitch to allow this ? I searched "procedure
parameter" and "procedural parameter" in the Language Reference, but
could not find anything.
As far as I know, the above is not allowed. you must declare the
callback type explicitly.
It can in iso and macpascal mode. Read the Pascal standard.
As far as I know, the above is not allowed. you must declare the callback type
explicitly.
TMyFunc = function : double;
function A(B : TMyFunc): double;
This is in line with 'declare before use': procedure parameter lists cannot be
used to declare types.
Similarly, you also cannot write:
function A(B : (one,two,three)) : double;
Not really. The function type declaration is a Borland invention, not original
Pascal.
Regards,
Adriaan van Os
_______________________________________________
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
