#![feature(once_cell)]usestd::lazy::OnceCell;letcell = OnceCell::new();letvalue = cell.get_or_init(||92);assert_eq!(value, &92);letvalue = cell.get_or_init(||unreachable!());assert_eq!(value, &92);
Merged bors merged 2 commits into PyO3:main from a1phyr:once_cell_try_init Dec 26, 2022 Merged Add GILOnceCell::get_or_try_init #2398 bors merged 2 commits into PyO3:main from a1phyr:once_cell_try_init Dec 26, 2022 +
马和骆驼都是哺乳动物,它们都有四只脚,体型也差不多大,我们将在这里为它们编写属于它们各自的类,输出相关语句。例如:一匹阿拉伯12岁的公马,在草原上奔跑的速度为50km/h。一匹双峰驼20岁的母骆驼,在沙漠上奔跑的速度为40kmh。class Horse(): def __init__(self, c
Ifyoudonotfindtherequiredinformationusingthetipsfromtheprevioussection,thenyouneedtoconsultanonlineservicetofindthepieceofinformationyouwerelookingfor.Threedifferenttypesofserviceshavebeenestablishedovertheyears:crawlers,directoriesandmetasearchengines.Thefirstcrawlerwascreatedbackin1993.ItwascalledtheWorldWideWorm.Itcra...
Unable to get value of the property 'init': object is null or undefi com.google.gwt.core.client.JavaScriptException : (TypeError) : 无法得到物产‘init的’价值: 对象是空或未定义描述: 无法得到物产‘init的’价值: 对象是空或未定义数字: -2146823281, (TypeError) : 无法得到物产‘init的’价值: ...
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almostthecompleteInternetindexedinit.Thedisadvantageisthatyougetthousandsofwebpagesasaresponseforalmostanyrequest.Webdirectoriesworkalittledifferently.Firstofalltheycontainastructuredtreeofinformation.Allinformationenteredintothistreeiseitherenteredbythewebmasterwhowantstoannouncehisnewwebpageorbythedirectorymaintainerwho...
本文简要介绍rust语言中core::lazy::OnceCell.get_or_try_init的用法。 用法 pubfnget_or_try_init<F, E>(&self, f: F) ->Result<&T, E>whereF:FnOnce() ->Result<T, E>, 获取单元格的内容,如果单元格为空,则使用f对其进行初始化。如果单元格为空且f失败,则返回错误。