aside default allocator, does stl has other allocators now?

Question

Stl default allocator, defined in allocator.h, is a simple wrapper of new, delete operator. Does stl has some other allocators, for example, memory-pool based allocator? If it has, which head file it is defined.

I explored the stl source code(4.1.1) and googled it, but can find anything.

Answer 1

Regarding whether the standard library supplies more allocator templates than std::allocator (disregarding the wrapper std::scoped_allocator_adapter ), searching through the C++11 PDF didn't find any.

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In other non-news…

The STL, the Standard Template Library , is not the same as the C++ standard library . The STL started as an Ada library (IIRC), developed by Stepanov. Stepanov and Stroustrup jointly proposed inclusion of most of the C++ version of STL into the standard library of the first C++ standardization, in 1998, and it was adopted. This part of the standard library is mainly about the iterators and algorithms.

Perusing the source code of some standard library implementation is not a good way to establish what functionality is standard. For that, the relevant standard is the authoritative source. But also sites like cppreference can be useful.