Understanding future perfecttense examples requires examining multiple perspectives and considerations. std::future - cppreference.com. The class template std::future provides a mechanism to access the result of asynchronous operations: 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 ... std::future<T>::valid - cppreference.com.
Checks if the future refers to a shared state. This is the case only for futures that were not default-constructed or moved from (i.e. returned by std::promise::get_future (), std::packaged_task::get_future () or std::async ()) until the first time get () or share () is called. The behavior is undefined if any member function other than the destructor, the move-assignment operator, or valid is ... From another angle, 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. 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.
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. It's important to note that, 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. The behavior is undefined if valid () is false before the call to this function, or Clock does not meet the Clock requirements. The programs is ill-formed if std::chrono::is_clock_v<Clock> is false.(since C++20) Specifies state of a future as returned by wait_for and wait_until functions of std::future and std::shared_future.
What is __future__ in Python used for and how/when to use it, and how .... 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.
It allows use of the new features on a per-module basis before the release in ... The promise is the "push" end of the promise-future communication channel: the operation that stores a value in the shared state synchronizes-with (as defined in std::memory_order) the successful return from any function that is waiting on the shared state (such as std::future::get). Building on this, cannot build CMake project because "Compatibility with CMake < 3.5 has ....
In this case it does work. In general, it probably doesn't. I'm wondering how this break in backwards compatibility should in general be navigated.
This perspective suggests that, perhaps installing a previous version of CMake is the only way that always works? That would mean that each project in the future should specify the CMake version on which it should be built.
📝 Summary
Important points to remember from this article on future perfect tense examples reveal the importance of understanding this subject. By applying this information, one can gain practical benefits.