What are the differences between custom allocators and default allocators in C++11?

What are the differences between custom allocators and default allocators in C++11?

In C++11, a custom allocator allows you to define how memory is allocated and deallocated, while the default allocator uses the standard memory management provided by the STL. Custom allocators can optimize memory usage for specific scenarios.

Can you give me an example of when to use a custom allocator?

Sure! If you're developing a performance-critical application that requires frequent allocations and deallocations, a custom allocator can reduce fragmentation and improve speed by managing memory more efficiently.

What are the potential downsides of using a custom allocator?

The downsides include increased complexity in your code, potential for bugs if not implemented correctly, and the need to ensure compatibility with STL containers.

How do I implement a simple custom allocator?

To implement a simple custom allocator, you need to define a class that provides methods like allocate, deallocate, and construct. You can then use this class as a template parameter in STL containers.