std::future
时间: 2023-10-19 10:08:35 浏览: 76
std::future is a class template in the C++ programming language that represents a future result of an asynchronous operation. It is part of the C++11 standard library and provides a way to retrieve the result of an asynchronous operation without blocking the calling thread.
A future object can be created by calling a function that returns a std::future. The future object can be used to check whether the operation has completed, to retrieve the result of the operation, or to wait for the operation to complete if it hasn't already.
The std::future class template is a generic type that can be instantiated with any type T. The future object holds a value of type T that will be produced by an asynchronous operation. Once the operation is complete, the value can be retrieved from the future object by calling the get() method. If the operation has not completed yet, the get() method will block the calling thread until the result is available.
The std::future class template is often used in conjunction with std::async, which is a function template that launches an asynchronous task and returns a future object that represents the result of the task.
Overall, std::future provides a convenient and efficient way to work with asynchronous operations in C++, allowing developers to write more efficient and responsive code.
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