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Git submodule head 'reference is not a tree' error

I have a project with a submodule that is pointing to an invalid commit: the submodule commit remained local and when I try to fetch it from another repo I get: ...
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Error installing mysql2: Failed to build gem native extension

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https://www.tsingfun.com/ilife/life/1004.html 

程序员用数据思维教你如何追女生 - 杂谈 - 清泛网 - 专注C/C++及内核技术

... 针对这些爱好去邀请她,你要制定好充分的计划以及backup。提前预案,一条龙安排好,她负责美,你负责其他就好了。 4、迭代进行约会,永远不断check女孩的心 在程序员的世界,需求一直是变的。女生的世界也是一样啊。...
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What are Aggregates and PODs and how/why are they special?

This FAQ is about Aggregates and PODs and covers the following material: 6 Answers 6...
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What's the fastest way to merge/join data.frames in R?

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When should you use a class vs a struct in C++?

In what scenarios is it better to use a struct vs a class in C++? 25 Answers 25 ...
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Read file line by line using ifstream in C++

The contents of file.txt are: 8 Answers 8 ...
https://www.tsingfun.com/ilife/tech/806.html 

比尔盖茨“未来生活预言”的科技豪宅(图) - 资讯 - 清泛网 - 专注C/C++及内核技术

...市区开车只需25分钟。“世外桃源2.0”这个名字来源于《CitizenKane》里 CharlesFosterKane虚构的房屋。 盖茨把岸边小山挖去一半,前临水、后倚山,堪称聚拢财气、卧虎藏龙的风水宝地。占地当然极为庞大,66000平方英亩,相当于几...
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从异构软件开发者的角度看异构计算 - 操作系统(内核) - 清泛网 - 专注C/C++...

...呢?首先我们知道现在有很多可以用于计算的单元,诸如CPU,GPU,MIC,DSP,FPGA等等,如果在同一个计算机系统中加入不同的计算单元,那么组成的这个计算机系统就可以认为是一个异构的计算平台。大多数人认为现在比较成熟...
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浅谈Heatmap:网页热点图生成原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...,此技术被称作Heatmap,已经有网站提供此类服务,如:clickdensity,clicktale,crazyegg等等,甚至还有类似clickheat项目提供源代码供你直接使用。 不过最灵活的方案莫过于自己搞定,下面大概说说Heatmap的实现: 捕捉点击 当然,...