C++ : Does std::allocator_traits define rebind_alloc if rebind not present in custom allocator?

C++ : Does std::allocator_traits define rebind_alloc if rebind not present in custom allocator?
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C++ : Does std::allocator_traits define rebind_alloc if rebind not present in custom allocator?
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define not in if allocator? present : rebind rebind_alloc C++ Does custom std::allocator_traits