Rust闭包

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闭包*在Rust 是一个稍微专业的语法，可以捕捉到封闭的环境函数。这种语法和能力使它们在运行使用非常方便。一些特性包括：

fn main() {

// Increment via closures and functions.

fn function (i: i32) -> i32 { i + 1 }

// Annotation is identical to function annotation but is optional

// as are the `{}` wrapping the body. These nameless functions

// are assigned to appropriately named variables.

let closure_annotated = |i: i32| -> i32 { i + 1 };

let closure_inferred = |i | i + 1 ;

let i = 1;

// Call the function and closures.

println!("function: {}", function(i));

println!("annotated closure: {}", closure_annotated(i));

println!("inferred closure: {}", closure_inferred(i));

// A closure taking no arguments which returns an `i32`.

// The return type is inferred.

let one = || 1;

println!("closure returning one: {}", one());

// It is possible to capture variables from the enclosing

// environment; something which is impossible with functions.

let professor_x = "Charles Xavier";

// A closure which takes no argument, returning nothing, prints

// a variable from the enclosing scope.

let print = || println!("Professor X's name is: {}", professor_x);

// Call the closure.

print();

}

*.也被称为lambda表达式或匿名函数。

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