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Why can't I forward-declare a class in a namespace using double colons?
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Because you can't. In C++ language fully-qualified names are only used to refer to existing (i.e. previously declared) entities. They can't be used to introduce new entities.
And you are in fact "reopening" the namespace to ...
Drawing a dot on HTML5 canvas [duplicate]
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Simon SarrisSimon Sarris
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Passing variable arguments to another function that accepts a variable argument list
So I have 2 functions that both have similar arguments
9 Answers
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grep a file, but show several surrounding lines?
I would like to grep for a string, but also show the preceding five lines and the following five lines as well as the matched line. How would I be able to do this?
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Merge multiple lines (two blocks) in Vim
I'd like to merge two blocks of lines in Vim, i.e. take lines n..m and append them to lines a..b . If you prefer a pseudocode explanation: [a[i] + b[i] for i in min(len(a), len(b))]
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Press any key to continue [duplicate]
...type some input, and then press enter to continue. Not exactly the correct behavior if you want to have "Press any key to continue". (Wait... where's the Any key?!)
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linux ls、ll命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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示例：a）给当前用户添加执行权限
chmod u+x text.txt
b）给当前用户组添加写权限
chmod g+w Text.txt
c）给其他用户添加读权限
chmod o+r Text.txt
2）如何修改文件所有者？
示例：将所有者修改为wm
chown linux wm
3）如何修改文件所...
Test whether a list contains a specific value in Clojure
What is the best way to test whether a list contains a given value in Clojure?
18 Answers
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case-insensitive list sorting, without lowercasing the result?
...ld)
In Python 2 use lower():
sorted_list = sorted(unsorted_list, key=lambda s: s.lower())
It works for both normal and unicode strings, since they both have a lower method.
In Python 2 it works for a mix of normal and unicode strings, since values of the two types can be compared with each oth...
How to get the pure text without HTML element using JavaScript?
I have the 1 button and some text in my HTML like the following:
10 Answers
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