[boost] Re: Re: Singleton

From: Pavel Vozenilek (pavel_vozenilek_at_[hidden])
Date: 2005-01-09 10:56:38

"Jason Hise" wrote:

> Actually, that try block exists for only the specific case when the 
> constructor throws... I'm not sure how it could be implemented via RAII, 
> as dependencies should only be decremented upon failure.  The dtor itself, 
> and thus ReleaseDependency, should not be called if new or the ctor 
> throws.
>

struct undoer_t {
   int* value;
  undoer_t(int* val) value(val) {}
  ~undoer_t() { if (value) --*value; }
  void dismiss() { value = 0; }
} undoer(&dependents);

..... possibly throwing operation

undoer.dismiss();

/Pavel