宏(也称为“声明式宏”或“模式宏”)和过程宏。本文主要是介绍Rust声明式宏的定义和使用,以及一些宏编程基本原理,帮助大家实现Rust宏编程入门。 一、获取关于宏 熟悉C语言的童鞋对宏不会陌生,比如定义一个取最小值的宏,类似这样: #define MIN(a, b) ((a) < (b) ? (a) : (b)) 应用该宏,取两个字...
高级函数/闭包:函数指针(function pointer)和返回闭包(return closures)。 宏(macro): 一种定义代码的方法,这些方法会在编译的时候定义更多的代码(ways to define code that defines more code at compile time)。unsafe Rust[2] 目前我们代码都是基于内存安全的,并且会在编译阶段进行限制报错不安全代码。
Rust macro is also useful when we need to generate repetitive code. We can define a macro to accept arguments and repeat the generated code based on those arguments. Themacro_rules!macro supports repetition using the$(...)*syntax. The...inside the parentheses can be any valid Rust expressio...
Harden proc macro path resolution and add integration tests. (#17330) 1个月前 CODE_OF_CONDUCT.md Update CODE_OF_CONDUCT.md 5年前 CONTRIBUTING.md Reworded the CONTRIBUTING.md doc (#16849) 3个月前 CREDITS.md Fix typos CREDITS.md (#17899) ...
$crate::try_migrate_toml_chain!(error: $err, chain: [$a, $($rest),+]) ); } This works, but is quite verbose. It gets even more verbose with 3 arguments. This leads me to my question. Question Is there an easy(er) to define a macro so the keyword-ish inputs can be position...
具体来说,define_type_foldable_and_lift 首先通过宏 ast_struct! 定义了一系列语法树节点的结构体,这些结构体表示不同的类型和语法结构。然后给每个结构体实现了 TypeFoldable 的方法。这些方法根据具体的类型组织起来,通过递归调用 TypeFoldable 的方法实现类型的遍历和转换。 除了TypeFoldable 的实现,define_type_fol...
include/linux/compiler-gcc4.h:79:43: note: expanded from macro'asm_volatile_goto' # define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) 1. 2. 3. 4. 5. 据C2Rust文档介绍,需要最新的libclang才能支持此语法。
The C standard technically only requires that this type be a signed integer that is at least the size of a short; some systems define it as an [i16], for example. Equivalent to C's void type when used as a [pointer]. In essence, *const c_void is equivalent to C's const void*...
1.#defineSUBvoid 2.#defineBEGIN{ 3.#defineEND} 4. 5.SUBmain()BEGIN 6.printf("Oh,thehorror!\n"); 7.END 编译过程的下一个阶段是语法解析(parsing)。这一过程中, 一系列的标记将被转换成一棵抽象语法树 -7-文档使用书栈网·BookStack构建源码解析过程 ...
Add a dependency on thebootloader_apicrate in your kernel'sCargo.toml. Your kernel binary should be#![no_std]and#![no_main]. Define an entry point function with the signaturefn kernel_main(boot_info: &'static mut bootloader_api::BootInfo) -> !. The function name can be arbitrary. ...