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Start a new stackful coroutine that executes on a given execution context.
template< typename ExecutionContext, typename F, typename CompletionToken = DEFAULT> DEDUCED spawn( ExecutionContext & ctx, F && function, CompletionToken && token = DEFAULT, typename constraint< is_convertible< ExecutionContext &, execution_context & >::value >::type = 0);
This function is used to launch a new stackful coroutine.
Identifies the execution context that will run the stackful coroutine.
The coroutine function. The function must be callable the signature:
void function(basic_yield_context<Executor> yield);
The completion
token that will handle the notification that the coroutine
has completed. If the return type R
of function is void, the function signature of the
completion handler must be:
void handler(std::exception_ptr);
Otherwise, the function signature of the completion handler must be:
void handler(std::exception_ptr, R);
void(std::exception_ptr, R)
where R is the return type
of the function object.
The new thread of execution is created with a cancellation state that supports
cancellation_type::terminal values only. To change the cancellation
state, call the basic_yield_context member function
reset_cancellation_state.