Re: const char *

On Fri, 6 Aug 2010, Rich Mattes wrote:

> It looks like the compiler is treating "crabbing" as a const-qualified
> string.  Since none of the set/get functions are expected to modify the key
> string you pass, it seems sane to modify all of them to accept const
> arguments (this guarantees that the function will just be looking at the
> value of the string, and won't modify it.)  You could go through and change
> all of the c/c++ client code to use const chars as arguments.  It would
> probably require a lot of work; in order to preserve the const qualifier in
> libplayerc you'd have to change the player_*prop_req_t structs (in
> libplayerinterface/player.h) so the property string is a const, then you'd
> have to change all the c and c++ function prototypes and definitions, etc.
>
> As a workaround, you might also be able to do something like:
>
> char* property = "crabbing";
> pp->SetIntProp(property,1);
>

Oh no, "crabbing" is const char *, however you can still use it to fill 
char array:
char property[] = "crabbing";
pp->SetIntProp(property, 1);

Paul

> This should get gcc off your back since you'd be passing a plain old char*
> like it wants.
>
> Rich
>
> -----Original Message-----
> From: Fred Labrosse [mailto:[email protected]]
> Sent: Thursday, August 05, 2010 11:51 AM
> To: [email protected]
> Subject: [Playerstage-developers] const char *
>
> All,
>
> Whenever I call:
>
> pp->SetIntProp("crabbing", 1);
>
> my compiler complains:
>
> warning: deprecated conversion from string constant to 'char*'
>
> So I started editing clientproxy.h and clientproxy.cc in my svn working copy
>
> to add the const's with a view of submitting a patch.
>
> Obviously, the compilation fails because the underlying c code (in
> playerc.h)
> does not have the const's.  I haven't done any pure c in a while so I'm not
> too sure what to do with that.  I think gcc will be happy with added
> "const"s
> but this might not be generic enough.  And I'm not too sure what the
> repercussions of that will be with the rest of the code.  I could
> const_cast,
> but this somehow defeats the point...
>
> Any suggestions?
>
> Cheers,
>
> Fred
>
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