闭包和连续的区别 [英] difference between closures and continuations

问题描述

有人可以解释闭包和延续之间的区别吗？ wikipedia中的相应文章并不真正比较两者之间的差异。

Can someone please explain the difference between closures and continuations? The corresponding articles in wikipedia do not really compare the differences between the two.

推荐答案

closure是一个函数，

A closure is a function that captures data from the environment on which it was declared.

int myVar = 0;
auto foo = [&] () { myVar++; }; <- This lambda forms a closure by capturing myVar
foo();
assert(myVar == 1);

延续是一个更抽象的概念，指的是之后应该执行什么代码。它可以使用闭包实现。

A continuation is a more abstract concept, and refers to what code should be executed afterwards. It can be implemented using a closure.

myTask = Task([] () { something(); });
myTask.then([=] () { myFoo.bar(); }); // This closure is the continuation of the task
myTask.run();

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