kingbiz...@gmail.com wrote:
I come here humbly to ask for a new implementation, the IIF ?:, the IIF
is a shortcut that make the coding a little faster, it works by
returning a true or a false part of a condition, a more detailed
information can be found there: http://en.wikipedia.org/wiki/%3F:
*PHP and C++ implementation:* Value *=* condition *?* value if true *:*
value if false;
*Pascal implementation:* Value := IfThen(Condition, TruePart, FalsePart);
*function IfThen(Condition: Boolean; IfTrue, IfFalse: X): X; overload;
begin
if Condition then Result := IfTrue else Result := IfFalse;
end;
*
Note that there is a tiny little difference between those two.
the ?: operator evaluates either the TruePart or FalsePart while IfThen
will evaluate both parts first.
The following will succeed
var
p: PInteger;
i: Integer;
begin
p := nil;
i := p <> nil ? p^ : 0;
end;
The following will fail
var
p: PInteger;
i: Integer;
begin
p := nil;
i := IfThen(p <> nil, p^ , 0);
end;
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