[fpc-devel] Unicode and UTF8String
jonas.maebe at elis.ugent.be
Mon Dec 1 22:45:33 CET 2008
On 01 Dec 2008, at 22:33, Martin Friebe wrote:
> I suggested to have a rtl, that has overloaded functions for each
> string type.
> of course that sounds easier than in fact it will be.
> Florian pointed out a few issues, like overloading by result is not
> possible (yet?).
No, it is fundamentally impossible. First of all, because a Pascal
compiler does not look at how the result of an expression is used
while parsing the expression (so while evaluating a function call, the
compiler has no idea what the "expected" result type is). That's
simply how Pascal works.
And how could the compiler decide what to call here:
function f: longint;
function f: string;
There are an immense amount of similar examples possible (and if you
add operator overloading in the mix, it increases exponentially), and
you'd get a huge amount of "can't decide which overloaded function to
call" errors even if the compiler were hacked to take the use of the
function results into account.
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