(not(target_os = "linux"))就如期运行了,的确如教程所言(Both utilize identical argument syntax),#[cfg(...)]和cfg!(...)的参数结构相同。 猜度not() 可作为一般布尔表达式的取否,先写了个简单条件语句: fnmain(){if(2<1){println!("没错");}else{println!("错了!");}} 报警说条件的括号不...
useproc_macro::TokenStream;#[proc_macro]pubfncmd_execute(input: TokenStream)->TokenStream {// 只接受一个字符串参数letinput: syn::LitStr = syn::parse(input).unwrap();#[cfg(target_os="windows")]letsh="cmd";#[cfg(not(target_os="windows"))]letsh="bash";letmutcmd= std::process::Com...
#[cfg(any(foo, bar))] 若条件`foo`或`bar`任意一个成立,则编译以下的Item #[cfg(not(foo))] 若`foo`不成立时编译 条件编译属性只可以应用于Item,如果想应用在非Item中怎么办呢?可以使用cfg!宏,如 if cfg!(target_arch = "x86") { } else if cfg!(target_arch = "x86_64") { } else if ...
[cfg(not(test))] #![cfg(test)] end!
(DLL_FILE); if dll_symbol.exists() { fs::remove_file(dll_symbol.clone()).unwrap(); } os::windows::fs::symlink_file(dll_origin.clone(), dll_symbol.clone()).unwrap(); } }#[cfg(not(windows))]fn symbolic_link_dll(exe_dir: &PathBuf) { unreachable!("算是家庭作业,自己实现看看。
#[cfg(not(test))]#[lang="exchange_malloc"]#[inline]unsafe fnexchange_malloc(size:usize,align:usize)->*mut u8{ifsize==0{alignas*mut u8}else{letlayout=Layout::from_size_align_unchecked(size,align);letptr=alloc(layout);if!ptr.is_null(){ptr}else{handle_alloc_error(layout)}}}#[cfg_at...
;Ok(parsed)}usestd::io::ErrorKind;fnmain(){letconfig=matchread_file(){Ok(cfg)=>cfg,Err(err)=>{matcherr.downcast_ref::<std::io::Error>(){Some(err)=>matcherr.kind(){ErrorKind::NotFound=>{println!("File not found !");}_=>{}},None=>{}}matcherr.downcast_ref::<serde_json...
[allow(clippy::filter_map)]#[cfg_attr(linux,path="linux.rs")]#[cfg_attr(windows,path="windows.rs")] 按照语法可以写出一个这样例子: #[target(windows,not(config=”true”,ubuntu(“config”=false,sixteen)))] 翻译过来的语法规则描述如下:...
println!("Yes. It's not linux!"); } } ``` 例子2: ``` //main.rs #[cfg(some_condition)] fn conditional_function() { println!("condition met!"); } fn main() { conditional_function(); println!("Hello, world!"); } ``` ...
#[cfg_attr(not(test), lang = "String")] pub struct String { vec: Vec<u8>, } #[stable(feature = "rust1", since = "1.0.0")] #[cfg_attr(not(test), rustc_diagnostic_item = "Vec")] #[rustc_insignificant_dtor] pub struct Vec<T, #[unstable(feature = "allocator_api", issue...