deduction guides for std::scoped_allocator_adaptor

Defined in header <scoped_allocator>
template<class OuterAlloc, class... InnerAllocs>

scoped_allocator_adaptor(OuterAlloc, InnerAllocs...)

  -> scoped_allocator_adaptor<OuterAlloc, InnerAllocs...>;
(since C++17)

One deduction guide is provided for std::scoped_allocator_adaptor to make it possible to deduce its outer allocator.

Example