Allocated memory in an object structure

The header files define new use as many as six new overloaded method. One of two ways - placement new and placement new [] can you have allocated memory buffer is defined in an object or a group of array objects.


Instead of the ordinary with placement new new definition of the object, in some applications time-played no small role in the definition of the object that the program should be completed within a certain time. New definition of the objects of ordinary survival is uncertain and, therefore, may cause operation failure.

In order to avoid the failure, we can allocate a large enough and did not use the memory buffer, and then process all the objects assigned to the buffer. In order to simplify the discussion, we focus on placement new.

Firstly, the new general allocation of memory buffer, but do not use dynamic or static storage device, because it may not meet the requirements to correct structural object.

void * buff = new char [sizeof (Myclass)];

Then, using placement new well in the buffer has been allocated to create an object.

# Include file / / needed for placement new

Myclass backup tmp = new (buff) Myclass;


Be noted that, p is a point Myclass type of object. The object has been assigned to the buffer.

Free storage and distribution to the different ordinary object is placed on the object destructor must be explicitly called.

p-> ~ Myclass (); file / / explicit destructor invocation

Failure to call the destructor will cause unknown problems. Typically, the only clear after the call to the destructor to release the contents of the buffer.

delete [] buff;






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