[PD] pd-extended build on 9.10 /gem 0.92.1 eeepc = no luck with v4l2

[Claude Heiland-Allen]

zmoelnig at iem.at wrote:
> Quoting "Mathieu Bouchard" <matju at artengine.ca>:
>> hi, the problem is not the type of «filename», it's the type of 
>> «extension», because the error message is about casting const to 
>> non-const, and not the other way around.

True - nicely spotted.

> "man strrchr" says:
>  char *strrchr(const char *s, int c);

Sure, but that's the C version, I imagine?

"two overloaded versions provided in C++."
-- http://www.cplusplus.com/reference/clibrary/cstring/strrchr/

> i don't see any problems here. what is it, that i am missing?

C != C++

C++ should use only the argument types to determine which function to 
call (if my memory is correct).

So a const argument forces C++ strrchr to return a const result (which 
is semantically correct, imho the C version is incorrectly specified to 
the point of being dangerous).

This cannot be converted to a non-const value without explicit casting 
(and arguably shouldn't be casted at all, as const values could well be 
in read-only memory, causing crashes when modification is attempted).


Claude
-- 
http://claudiusmaximus.goto10.org