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What is the difference between memory allocation through new and allocator

What is the difference between memory allocation via new/ mallocand allocator?

Why would we ever need a separate memory allocator for a vector if we have the newand options malloc?

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When you use new or malloc, memory management is tightly coupled with the corresponding functions at runtime of your compiler. In contrast, when a allocator is used, memory management is delegated to a allocator, which can be replaced. This allows you to change the memory management functions used.

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allocator allocate(), :

pointer allocate (size_type n, allocator<void>::const_pointer hint=0);

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A allocator is a memory manager. For example, STL containers provide default dispensers, but they can be configured as an explanation in this article (tutorial for STL dispensers): http://www.codeguru.com/cpp/cpp/cpp_mfc/stl/article.php/c4079/Allocators -STL.htm .

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