1.1 如何使用 lazy_static! 创建全局可变变量的例子 lazy-static crate可以取代一些创建单例的复杂代码。 以下是一个全局可变 vector: #[macro_use] extern crate lazy_static; use std::sync::Mutex; lazy_static! { static ref ARRAY: Mutex<Vec<u8>> =
lazy_static的意图更为通用,初始化map只是其众多用途之一。 三、参考文章: 《how-do-i-create-a-global-mutable-singleton》https://stackoverflow.com/que... 《perfect hash fucnction》https://en.wikipedia.org/wiki...
NSError * error = nil; NSDictionary * dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error]; NSMutableArray * originalArray = [dic objectForKey:@"news"]; //封装数据对象 NSMutableArray * resultArray = [NSMutableArray array]; for (int i=0 ...
static int instanceCount = 0; public LargeObject() { if (1 == Interlocked.Increment(ref instanceCount)) { throw new ApplicationException("Throw only ONCE."); } initBy = Thread.CurrentThread.ManagedThreadId; Console.WriteLine("LargeObject was created on thread id {0}.", initBy); } Quan...
/// [mutable `static`]: https://doc.rust-lang.org/reference/items/static-items.html#mutable-statics /// [`lazy`]: https://doc.rust-lang.org/nightly/std/lazy/index.html /// [`lazy_static`]: https://crates.io/crates/lazy_static /// [`once_cell`]: https://crates.io/crates/onc...
$mol_db - Static typed IndexedDB wrapper with auto migrations. $hyoo_crowd - Conflict-free Reinterpretable Ordered Washed Data. $mol_plot - Fastest plot lib for vector graphics. All of them are very small, powerful and fastest. Use it for your pleasure. Contributors This project exists than...
public static void main(String[] args) { // MutableDynaClass dynaClass=new LazyDynaClass(); // dynaClass.add("amount", java.lang.Integer.class); // dynaClass.add("stuname", java.lang.String[].class); // dynaClass.add("map", java.util.Map.class); ...
init] autorelease]; self.newsPic = [downloader loadLocalImage:_newsPicUrl]; } return self;}+ (NSMutableArray *)handleData:(NSData *)data;{ //解析数据 NSError * error = nil; NSDictionary * dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&erro...
// end body}privatestructOffsetPreferenceKey:PreferenceKey{staticvardefaultValue:CGFloat=.zerostaticfuncreduce(value:inoutCGFloat,nextValue:()->CGFloat){}} 固定到滚动视图的顶部 LazyVStack 有个参数 pinnedViews 可以用于固定滚动视图的顶部。 ScrollView{LazyVStack(alignment:.leading,spacing:10,pinnedViews:....
Safety is guaranteed by requiring a mutable reference. Examples #![feature(once_cell)]usestd::lazy::OnceCell;letmutcell:OnceCell<String>=OnceCell::new();assert_eq!(cell.take(),None);letmutcell=OnceCell::new();cell.set("hello".to_string()).unwrap();assert_eq!(cell.take(),Some("he...