#### windows::overlapped_ptr::overlapped_ptr

Construct an empty `windows::overlapped_ptr`.

    overlapped_ptr();
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Construct an `windows::overlapped_ptr` to contain the specified handler.

    template<
        typename ExecutionContext,
        typename Handler>
    explicit overlapped_ptr(
        ExecutionContext & context,
        Handler && handler,
        typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type *  = 0);
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    template<
        typename Executor,
        typename Handler>
    explicit overlapped_ptr(
        const Executor & ex,
        Handler && handler,
        typename enable_if< execution::is_executor< Executor >::value||is_executor< Executor >::value >::type *  = 0);
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