From: firstname.dot.lastname@googlemail.com   
      
   On Mon, 17 Sep 2012 14:24:15 -0700, MiB wrote:   
      
   > Yes, you can avoid the problem. However since "new" is a perfectly   
   > valid construct in C++ and it was used as an example for a   
   > non-tracked resource allocation *only*, your correction completely   
   > misses the point.   
      
   I don't believe it does miss the point. Rewriting your example as:   
      
   class Foo{   
       SomeUntrackedResource a, b, c;   
      
       public:   
          Foo()   
          {   
             //try to allocate a and cleanup on failure.   
      
      
             //try to allocate b and cleanup a and b on failure.   
      
             //try to allocate c and cleanup a and b and con failure.   
          }   
   }   
      
   It is almost certainly easier, cleaner and more reusable to write a   
   small class which manages a single instance of the resource using   
   RAII, and then Foo will simply have three of those objects instead.   
   vector<> is a reasonable example of such a class for memory.   
      
   To illustrate what it may be more like for something not already   
   managed, consider rewriting your example as:   
      
   struct Mem{   
       char* const data;   
      
        Mem(size_t s)   
        :data(new (nothrow) char[s])   
        {   
            if(!data)   
              throw bad_alloc();   
        }   
      
        ~Mem()     {   
           delete data;   
         }   
   };   
      
   class A{   
      Mem cstr1;   
      Mem cstr2;   
      Mem cstr3;   
   	   
      public:   
      A()   
      :cstr1(1000),   
       cstr2(1000000),   
       cstr3(1000000)   
      {   
      }   
   };   
      
   The result is about the same length, and the logic is easier to   
   follow.   
      
   -Ed   
      
      
      
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