如何匹配具有多个字段的选项？(How to match for an Option with multiple fields?)

如何匹配具有多个字段的选项？(How to match for an Option with multiple fields?)

如何匹配具有多个字段的选项？ 我有以下代码：

let opt_windowrecv = glfw_context.create_window(1280, 720, "Hello World!", glfw::Windowed); // returns Option<(Window, Receiver<(f64, WindowEvent)>)> let window = match opt_windowrecv { // Does not compile Some(window, _) => window, None => return };

它抱怨说：

这个模式有2个字段，但相应的变量有1个字段

然而，使用此解决方法确实有效：

let opt_windowrecv = glfw_context.create_window(1280, 720, "Hello World!", glfw::Windowed); // returns Option<(Window, Receiver<(f64, WindowEvent)>)> let windowrecv = match opt_windowrecv { Some(windowrecv) => windowrecv, None => return }; let (window, _) = windowrecv;

我做错了什么，或者这是Rust编译器中的错误？ 我正在使用glfw-rs库 。

How do I match for an Option with multiple fields? I have the following code:

let opt_windowrecv = glfw_context.create_window(1280, 720, "Hello World!", glfw::Windowed); // returns Option<(Window, Receiver<(f64, WindowEvent)>)> let window = match opt_windowrecv { // Does not compile Some(window, _) => window, None => return };

It complains saying:

this pattern has 2 fields, but the corresponding variant has 1 field

Using this workaround does however work:

let opt_windowrecv = glfw_context.create_window(1280, 720, "Hello World!", glfw::Windowed); // returns Option<(Window, Receiver<(f64, WindowEvent)>)> let windowrecv = match opt_windowrecv { Some(windowrecv) => windowrecv, None => return }; let (window, _) = windowrecv;

Am I doing something wrong, or is this a bug in the Rust compiler? I am using the glfw-rs library.

最满意答案

let window = match opt_windowrecv { Some((window, _)) => window, None => return };

应该管用。 Some的解构应该是一个元组，而不是2个参数。

let window = match opt_windowrecv { Some((window, _)) => window, None => return };

Should work. The destructuring of Some should be a tuple, not 2 arguments.