Memory Resize Function

Lets say contiguous memory is not available for vector's elements and it is occupied by something else. How does the resize function of vector allocate memory to be contiguous allocation?

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SamReynolds

  • Apr 1st, 2010
 

The allocate method of the vector's Allocator is invoked to allocate the new space, the vector's content is copied to the newly allocated memory block, and then the deallocate method of the vector's Allocator is invoked to release the old memory block.

The vector is assigned an Allocator in its constructor. If no Allocator is provided when the vector is created (by far the most common case), the default allocator class template is instantiated for the vector content type and assigned as the vector's allocator. This default allocator uses ::operator new to allocate and ::operator delete to deallocate memory.

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