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 The creator of the asynchronous operation can then use a variety of methods to query, wait for, or extract a value from the std. 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. 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. 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. 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.
Valid() == true after the call The behavior is undefined if valid() == false before the call to this function. 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 If the future is the result of a call to async that used lazy evaluation, this function returns immediately without waiting The behavior is undefined if valid () is false before the call to this function, or clock does not meet the clock requirements
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
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