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Design Pattern for Undo Engine
I'm writing a structural modeling tool for a civil enginering application. I have one huge model class representing the entire building, which include collections of nodes, line elements, loads, etc. which are also custom classes.
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Why is the default value of the string type null instead of an empty string?
It's quite annoying to test all my strings for null before I can safely apply methods like ToUpper() , StartWith() etc...
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Shuffle two list at once with same order
I'm using the nltk library's movie_reviews corpus which contains a large number of documents. My task is get predictive performance of these reviews with pre-processing of the data and without pre-processing. But there is problem, in lists documents and documents2 I have the same documents ...
Is volatile expensive?
After reading The JSR-133 Cookbook for Compiler Writers about the implementation of volatile, especially section "Interactions with Atomic Instructions" I assume that reading a volatile variable without updating it needs a LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad ...
What is the difference between a HashMap and a TreeMap? [duplicate]
I started learning Java. When would I use a HashMap over a TreeMap?
8 Answers
8
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git + LaTeX workflow
I'm writing a very long document in LaTeX. I have my work computer and my laptop, and I work on them both. I need to keep all the files synchronized between the two computers, and also would like to keep a revision history. I chose git as my DVCS, and I'm hosting my repository on my server. I'm also...
AWS Difference between a snapshot and AMI
So I am having trouble working out what, specifically is the difference between these two.
10 Answers
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Why isn't String.Empty a constant?
In .Net why is String.Empty read only instead of a constant? I'm just wondering if anyone knows what the reasoning was behind that decision.
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How can I exclude $(this) from a jQuery selector?
I have something like this:
4 Answers
4
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C++形参与实参的区别（实例解析） - C/C++ - 清泛网 - 专注C/C++及内核技术
...=*x;
*x=*y;
*y=tmp;
printf("Exchg3:x=%d,y=%d\n",*x,*y);
}
void main()
{
int a=4,b=6;
Exchg1 (a,b) ;
printf("a=%d,b=%d\n",a,b);
Exchg2 (a,b);
printf("a=%d,b=%d\n",a,b);
Exchg3(&a,&b) ;
printf("a=%d,b=%d\n",a,b);
}
这里Exchg1函数被调用的时候，并没有成功交...