An asynchronous operation (created via std::async, std::packaged_task, or std::promise) can provide a std::future object to the creator of that asynchronous operation If the future is the result of a call to async that used lazy evaluation, this function returns immediately without waiting The creator of the asynchronous operation can then use a variety of methods to query, wait for, or extract a value from the std.
Future Diary - Part 2 Review • Anime UK News
The get member function waits (by calling wait ()) until the shared state is ready, then retrieves the value stored in the shared state (if any)
Right after calling this function, valid () is false
If valid () is false before the call to this function, the behavior is undefined. Checks if the future refers to a shared state Returned by std::promise::get_future (), std::packaged_task::get_future () or std::async ()) until the first time get () or share () is called Unlike std::future, which is only moveable (so only one instance can refer to any particular asynchronous result), std::shared_future is copyable and multiple shared future objects may refer to the same shared state
Access to the same shared state from multiple threads is safe if each thread does it through its own copy of a shared_future object. If the future is the result of a call to std::async that used lazy evaluation, this function returns immediately without waiting This function may block for longer than timeout_duration due to scheduling or resource contention delays The standard recommends that a steady clock is used to measure the duration.
A std::future<t> is a handle to a result of work which is [potentially] not, yet, computed
You can imagine it as the receipt you get when you ask for work and the receipt is used to get the result back For example, you may bring a bike to bike store for repair You get a receipt to get back your bike While the work is in progress (the bike being repaired) you can go about other business.
A future statement is a directive to the compiler that a particular module should be compiled using syntax or semantics that will be available in a specified future release of python The future statement is intended to ease migration to future versions of python that introduce incompatible changes to the language Int64 if i understand the warning correctly, the object dtype is downcast to int64 Perhaps pandas wants me to do this explicitly, but i don't see how i could downcast a string to a numerical type before the replacement happens.
Specifies state of a future as returned by wait_for and wait_until functions of std::future and std::shared_future
