Execution context requirements

A type X meets the ExecutionContext requirements if it is publicly and unambiguously derived from execution_context, and satisfies the additional requirements listed below.

In the table below, x denotes a value of type X.

Table 17. ExecutionContext requirements

expression	return type	assertion/note pre/post-condition
`X::executor_type`	type meeting `Executor` requirements
`x.~X()`		Destroys all unexecuted function objects that were submitted via an executor object that is associated with the execution context.
`x.get_executor()`	`X::executor_type`	Returns an executor object that is associated with the execution context.