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How can I use pointers in Java?
...that Java programs can be created with pointers and that this can be done by the few who are experts in java. Is it true?
1...
How to make inline functions in C#
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Yes, C# supports that. There are several syntaxes available.
Anonymous methods were added in C# 2.0:
Func<int, int, int> add = delegate(int x, int y)
{
return x + y;
};
Action<int> print = delegate(int x)
{...
What are the differences between concepts and template constraints?
...onstraints as appeared in Dlang or the new concepts-lite proposal for C++1y ).
3 Answers
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How to crop an image in OpenCV using Python
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It's very simple. Use numpy slicing.
import cv2
img = cv2.imread("lenna.png")
crop_img = img[y:y+h, x:x+w]
cv2.imshow("cropped", crop_img)
cv2.waitKey(0)
s...
how to check the dtype of a column in python pandas
...s to treat numeric columns and string columns. What I am doing now is really dumb:
6 Answers
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Scala list concatenation, ::: vs ++
Is there any difference between ::: and ++ for concatenating lists in Scala?
4 Answers
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multiple packages in context:component-scan, spring config
...following approach is correct:
<context:component-scan base-package="x.y.z.service, x.y.z.controller" />
Note that the error complains about x.y.z.dao.daoservice.LoginDAO, which is not in the packages mentioned above, perhaps you forgot to add it:
<context:component-scan base-package="...
Modular multiplicative inverse function in Python
Does some standard Python module contain a function to compute modular multiplicative inverse of a number, i.e. a number y = invmod(x, p) such that x*y == 1 (mod p) ? Google doesn't seem to give any good hints on this.
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C++ stl stack/queue 的使用方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...元素。
访问栈顶，如例：s.top()
判断栈空，如例：s.empty()，当栈空时，返回true。
访问栈中的元素个数，如例：s.size()。
2、queue
queue 模板类的定义在<queue>头文件中。
与stack 模板类很相似，queue 模板类也需要两个模板参数...
Imitate Facebook hide/show expanding/contracting Navigation Bar
... Facebook iPhone app, when the user scrolls up the navigationBar gradually hides itself to a point where it completely vanishes. Then when the user scrolls down the navigationBar gradually shows itself.
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