#### basic_yield_context::basic_yield_context

Construct a yield context to represent the specified coroutine.

    basic_yield_context(
        const detail::weak_ptr< callee_type > & coro,
        caller_type & ca,
        Handler & handler);
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Construct a yield context from another yield context type.

    template<
        typename OtherHandler>
    basic_yield_context(
        const basic_yield_context< OtherHandler > & other);
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