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Store a completion handler in the container.
template< class Handler, class Allocator> void emplace( Handler&& handler, Allocator const& alloc);
            Requires this->has_value()
            == false .
          
| Name | Description | 
|---|---|
| 
                       | The completion handler to store. The implementation takes ownership of the handler by performing a decay-copy. | 
| 
                       | The allocator to use. |