-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi everybody,
I'm toying with operator overloading and classes. For example I want have a class that stores a value (of some type) and related to it additional information. For example imagine a class that stores a value and the associated unit: value=10, unit="px", plus whatever. Normally you have than two or more Properties which you will set one after another. In the spirit of the example let us imagine the property will be called "left", so left.Value := and left.Unit := have to be called. I also would like to read from this class. I can overload the assignment operator := in order to convert the class to a string s: s:=left; and s would be '100px'. The problem: I can't read the Value directly into an integer i by: i:=left; // instead of i:=left.Value . If I try to overload the := operator a "impossible operator overload" error is raised. Is this related to the pointer-operator-overload thing? Better would be to declare left.Value as the default property for integer assignments. Either way I don't see why current limitations are useful: integer/pointer to class or default properties only on indexed properties are in my opinion only important if the a unique decision by type is not possible. Especially because a "to-string" assignment works in every case. Only "ordinal" types like integer,byte, boolean,char are blocked. I suggest to rethink it. Andreas -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) iEYEARECAAYFAkoQRSkACgkQfp5vA04Sl1aJUwCfUOrqMiAv0YTST0mHk5Eq0CdV n5gAoIRGfDgTxxMUzZMBOa/3AcB0BVg9 =GYEf -----END PGP SIGNATURE----- _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
