What are the allocator requirements in C++17?

What are the allocator requirements in C++17?

In C++17, allocators must meet specific requirements to be used with standard containers. They need to provide methods for memory allocation, deallocation, and construction of objects.

Can you explain the key functions that an allocator must implement?

Sure! An allocator must implement the following key functions: allocate, deallocate, construct, and destroy. These functions manage memory and object lifetimes.

What is the purpose of the construct and destroy functions?

The construct function is used to create an object in allocated memory, while destroy is used to call the destructor for an object, ensuring proper cleanup.

Are there any default allocators provided in C++17?

Yes, C++17 provides a default allocator called std::allocator, which is a simple and general-purpose allocator that meets the requirements.