Ahhh well. I thought I was doing so well, but then I ran the code below
through valgrind. I have now discovered that I can't hide the parent class
destructor :-(
I guess I'd better go back to real work.
Angus
==31335== Invalid free() / delete / delete[]
==31335== at 0x4015E825: __builtin_delete (vg_clientfuncs.c:196)
==31335== by 0x4015E844: operator delete(void*) (vg_clientfuncs.c:205)
==31335== by 0x80486CA: void boost::checked_delete<int>(int*)
==31335== by 0x80486AA: boost::scoped_ptr<int>::~scoped_ptr()
==31335== Address 0x41127024 is 0 bytes inside a block of size 4 free'd
==31335== at 0x4015E79D: free (vg_clientfuncs.c:182)
==31335== by 0x8048647: lyx::custom_scoped_ptr<int>::~custom_scoped_ptr()
#include <cstdlib>
#include <boost/scoped_ptr.hpp>
namespace lyx {
template <typename T>
class custom_scoped_ptr : public boost::scoped_ptr<T> {
public:
explicit custom_scoped_ptr(T * p, void (* d)(void *))
: boost::scoped_ptr<T>(p), destroyer(d) {}
/// This destructor HIDES that of scoped_ptr.
~custom_scoped_ptr() { destroyer(get()); }
private:
void (* destroyer)(void *);
};
} // namespace lyx
int main ()
{
lyx::custom_scoped_ptr<int> ptr((int *)malloc(sizeof(int)), free);
*ptr = 1;
printf("*ptr = %d\n", *ptr);
return 0;
}
