Re: CArray of stdext::hash_map<int,int> not possible ( access violation ) ?

"Giovanni Dicanio" <>
Wed, 10 Mar 2010 11:58:46 +0100
"Adam" <> ha scritto nel messaggio

I have problems using CArray<> with hash_map<>. What's wrong with the
following code ?

class A
A() {}
A( const A& ) {}
~A() {}
void operator=( const A& ) {}

As already written, I susepct there is a missing "public:" in the above
class listing.

Moreover, the usual patterno for assignment operator is:

  A & operator=(const A &)

Moreover, if the member-wise copy is OK, and if each data member is a RAII
class that frees its own stuff, you should rely on C++ compiler default
implementation of copy constructor , assignment operator, constructor and

In other words, in your case, this should do OK:


class A
     // Compiler generated default ctor, copy ctor, operator= and dtor are
    stdext::hash_map<int,int> m_member;


Note that STL containers are very well composable together.
If you use std::vector instead of MFC CArray, this code will work fine:


    A item;
    std::vector<A> test;




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