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- 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
- Cant import annotations from __future__ - Stack Overflow
This future feature is also missing in Python 3 6 Why isn't it back ported? If I use annotations, they are widely supported in 3 7, so no need for a future If I run my code on an older Python, both, the annotations and the future are not supported So why this 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
- python - from __future__ import annotations - Stack Overflow
The first part is easy: You can use annotations because annotations have existed since Python 3 0, you don't need to import anything from __future__ to use them What you're importing if you do from __future__ import annotations is postponed annotations The postponed annotations feature means that you can use something in an annotation even if it hasn't been defined yet Try the following: def
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