Hi,
A type helper for a string can add a constructor.
But how it can be used differs between FPC and Delphi.
For example:
{$modeswitch typehelpers}
type
THelper = type helper for string
constructor Creator(i: integer);
end;
var
s: string;
begin
string.creator(3);
// allowed in delphi+fpc, creating a new string
s.creator(3);
// fpc: same as above, creating a new string
// delphi: error: Cannot call constructors using
// instance variables
end;
IMO the fpc way is inconsistent to how constructors work for classes
and records. A constructor usually only creates something when called
with the type (e.g. TObject.Create), while behaving like a normal
function when called with an instance (e.g. obj.create).
Is this a bug or by design?
Mattias
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