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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

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