Construct a std::experimental::packaged_task object with an
associated task and asynchronous result, using the supplied allocator
to allocate memory for the associated asynchronous result and task.
template<typename Allocator,typename Callable> packaged_task( std::allocator_arg_t, Allocator const& alloc, Callable func);
The expression func(args...) shall be valid, where each
element args-i
in args...
shall be a value of the corresponding type ArgTypes-i
in ArgTypes....
The return value shall be convertible to ResultType.
Constructs a std::experimental::packaged_task instance
with an associated asynchronous result of type ResultType
that is not ready and an associated task of
type Callable that
is a copy of func.
The memory for the asynchronous result and task is allocated through
the allocator alloc.
Any exception thrown by the allocator when trying to allocate memory
for the asynchronous result or task. Any exception thrown by the
copy or move constructor of Callable.
#include <experimental/future>