On 05/07/2011 11:24, michael.vancann...@wisa.be wrote:
On Tue, 5 Jul 2011, Martin wrote:
On 05/07/2011 04:02, Chad Berchek wrote:
Martin wrote:
I don't think it is a bug.
...
"(const s: string)" is a declaration by the programmer, that the
variable (the string) will not be modified at all. That is neither by
the procedure called, nor by any code outside the procedure, via any
other reference to the data. If the programmer sticks to what he
declared, then it works, if not it crashes.
Is that true? I am not necessarily asserting that your statement is
false; it could well be true. However I personally have not seen it
documented so if anyone has a reference I would like to see it. As
far as I have been able to tell from the docs of Delphi and FPC, the
const declaration does NOT mean the programmer promises to not
modify the instance; it means he promises to not modify the
variable, which the compiler does indeed enforce.
Well, I have pointed out myself,in my mail, that it probably needs
more documentation. I do not know if it is documented or not.
But it is the answer, I have gotten several times from developers in
the FPC team. So for all I know it is the intended behaviour. At
least intended in FPC (and apparently either intended or at least
implemented in Delphi). So if there is no documentation for it, then
it would appear a problem of documentation, rather than a bug in the
compiler (Again all based on the statements I was given)
There is no bug.
I think you misunderstood me. There is a (or there may be) a bug. But
*not* in the compiler, and *not* in the implementation of "const string".
I explicitly pointet that out on the top of the quotation "I don't think
it is a bug." (with reference to the feature itself)
The bug(s) is/are in user code, where the const construct is
*incorrectly* used.
An I was merely pointing out, that any usage without knowledge what it
does is incorrect usage (even if by accident it works). Therefore one
might consider such unaware/unknowing usage as a bug (a bug in the users
code)
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