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...
#define MAX(a, b) ((a) > (b) ? (a) : (b)) 我们也经常用宏实现泛型编程,像上面的,无关参数类型。也有如以下的复杂宏 #define EXPAND(x) x#define GET_MACRO(_1, _2, _3, _4, _5, _6, _7, _8, _9, NAME, ...) NAME#define PASTE(...) \EXPAND(GET_MACRO(__VA_ARGS__ _...
#include<stdio.h>#defineADD(a,b)(a)+(b);intmain(){int a=10;int b=22;int _res=ADD(a,b)_res=ADD(a+1,b)_res=ADD(a*2,b+3)} 这样,我们在使用宏的时候,就避免了意外结果的发生。这样展开之后的代码如下所示: 代码语言:javascript 复制 intmain(){int a=10;int b=22;int _res=(a)...
I have a cratehttps://crates.io/crates/magic_migratethat provides a traitTryMigrate. I'm working on writing a macro that allows someone to define this trait by providing an error and a "chain" of structs that define a migration order. Eventually I would like to make an even-more generic...
To define a lexer, use the lexer! macro.lexer! { fn take_token(tok: 'a) -> Token<'a>;First declare the name of the function, the name of the token you will be able to access within the lexer, and the return type of your lexer. You can also optionally declare a lifetime for ...
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。
MACRO(i32, std::int32_t) \ MACRO(i64, std::int64_t) \ MACRO(f32, float) \ MACRO(f64, double) #define FOR_EACH_TRIVIAL_STD_VECTOR(MACRO) \ FOR_EACH_NUMERIC(MACRO) \ MACRO(usize, std::size_t) \ MACRO(isize, rust::isize) #...
#[macro_use] extern crate native_windows_gui as nwg; use nwg::{Event, Ui, simple_message, fatal_message, dispatch_events}; /// Custom enums are the preferred way to define ui ids. It's clearer and more extensible than any other types (such as &'str). ...
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。
Add a new lint that warns for pointers to stack memory #134218 commented on Mar 15, 2025 • 0 new comments Do partial SsaLocals analysis in unoptimized builds #134051 commented on Mar 14, 2025 • 0 new comments handle paren in macro expand for let-init-else expr #134034 com...