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{
This program tries to test any aspect of procedure variables and related
stuff in Delphi mode
}
{$ifdef fpc}
{$mode delphi}
{$endif}
Type
TMyRecord = Record
MyProc1,MyProc2 : Procedure(l : longint);
MyVar : longint;
end;
procedure do_error(i : longint);
begin
writeln('Error near: ',i);
halt(1);
end;
var
globalvar : longint;
type
tpoo_rec = record
procpointer : pointer;
s : pointer;
end;
procedure callmethodparam(s : pointer;addr : pointer;param : longint);
var
p : procedure(param : longint) of object;
begin
tpoo_rec(p).procpointer:=addr;
tpoo_rec(p).s:=s;
p(param);
end;
type
to1 = object
constructor init;
procedure test1;
procedure test2(l : longint);
procedure test3(l : longint);virtual;abstract;
end;
to2 = object(to1)
procedure test3(l : longint);virtual;
end;
constructor to1.init;
begin
end;
procedure to1.test1;
var
p:pointer;
begin
// useless only a semantic test
p:=@to1.test1;
// this do we use to do some testing
p:=@to1.test2;
globalvar:=0;
callmethodparam(@self,p,1234);
if globalvar<>1234 then
do_error(1000);
end;
procedure to1.test2(l : longint);
begin
globalvar:=l;
end;
procedure to2.test3(l : longint);
begin
globalvar:=l;
end;
procedure testproc(l : longint);
begin
globalvar:=l;
end;
const
constmethodaddr : pointer = @to1.test2;
MyRecord : TMyRecord = (
MyProc1 : TestProc;
MyProc2 : TestProc;
MyVar : 0;
);
var
o1 : to1;
o2 : to2;
p : procedure(l : longint) of object;
begin
{ Simple procedure variables }
writeln('Procedure variables');
globalvar:=0;
MyRecord.MyProc1(1234);
if globalvar<>1234 then
do_error(2000);
globalvar:=0;
MyRecord.MyProc2(4321);
if globalvar<>4321 then
do_error(2001);
writeln('Ok');
{ }
{ Procedures of objects }
{ }
o1.init;
o2.init;
writeln('Procedures of objects');
p:=o1.test2;
globalvar:=0;
p(12);
if globalvar<>12 then
do_error(1002);
writeln('Ok');
p:=o2.test3;
globalvar:=0;
p(12);
if globalvar<>12 then
do_error(1004);
writeln('Ok');
{ }
{ Pointers and addresses of procedures }
{ }
writeln('Getting an address of a method as pointer');
o1.test1;
globalvar:=0;
callmethodparam(@o1,constmethodaddr,34);
if globalvar<>34 then
do_error(1001);
writeln('Ok');
end.
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