mthome@bbn.com (Mike Thome) (10/17/89)
Now that I've got g++ working here (thanks those who responded to my
earlier plea for help), I've got another problem...
The following code fragment (from InterViews):
class Resource {
public:
Resource () { refcount = 1; }
~Resource () { if (--refcount > 0) { this = 0; } }
void Reference () { ++refcount; }
int LastRef () { return refcount == 1; }
private:
unsigned refcount;
};
Generates the following error message:
foo.c: In method Resource::~Resource ():
foo.c:4: assignment of read-only parameter `$this'
As far as I can tell from Stroustrup, this appears to be a perfectly
valid use of THIS in a destructer. What's going on here?
-mik (mthome@bbn.com, mthome@thalamus.bu.edu) schmidt@glacier.ics.uci.edu (Doug Schmidt) (10/17/89)
In article <46991@bbn.COM>, mthome@bbn (Mike Thome) writes: >Now that I've got g++ working here (thanks those who responded to my >earlier plea for help), I've got another problem... >The following code fragment (from InterViews): > class Resource { > public: > Resource () { refcount = 1; } > ~Resource () { if (--refcount > 0) { this = 0; } } > > void Reference () { ++refcount; } > int LastRef () { return refcount == 1; } > private: > unsigned refcount; > }; > >Generates the following error message: > foo.c: In method Resource::~Resource (): > foo.c:4: assignment of read-only parameter `$this' > >As far as I can tell from Stroustrup, this appears to be a perfectly >valid use of THIS in a destructer. What's going on here? Assigning to this is an anachronism. However, you can make g++ accept this via the -fthis-is-variable option. Doug -- Master Swordsman speak of humility; | schmidt@ics.uci.edu (ARPA) Philosophers speak of truth; | office: (714) 856-4034 Saints and wisemen speak of the Tao of no doubt; The moon, sun, and sea speaks for itself. -- Hiroshi Hamada