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If T has a nested type allocator_type,
          returns t.get_allocator().
          Otherwise returns type().
        
static decltype(auto) get( const T & t); » more...
          If T has a nested type
          allocator_type, returns
          t.get_allocator().
          Otherwise returns a.
        
static decltype(auto) get( const T & t, const Allocator & a); » more...