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C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
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#include <memory>
template <class T>
class ReferenceCount {
public:
ReferenceCount(std::unique_ptr<T> ptr) : ptr_(std::move(ptr)), cnt_(1) {}
T *Ptr() const { return ptr_.get(); }
ReferenceCount *Ref() {
++cnt_;
return this;
}
void Deref() {
if (--cnt...
Programmatically generate video or animated GIF in Python?
...ate a video from. Ideally I could specify a frame duration for each frame but a fixed frame rate would be fine too. I'm doing this in wxPython, so I can render to a wxDC or I can save the images to files, like PNG. Is there a Python library that will allow me to create either a video (AVI, MPG, e...
Finding all possible permutations of a given string in python
I have a string. I want to generate all permutations from that string, by changing the order of characters in it. For example, say:
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How to keep one variable constant with other one changing with row in excel
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Use this form:
=(B0+4)/$A$0
The $ tells excel not to adjust that address while pasting the formula into new cells.
Since you are dragging across rows, you really only need to freeze the row part:
=(B0+4)/A$0
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What is the difference between == and equals() in Java?
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In general, the answer to your question is "yes", but...
.equals(...) will only compare what it is written to compare, no more, no less.
If a class does not override the equals method, then it defaults to the equals(Object o) method of the closest parent class that has ove...
Why does printf not flush after the call unless a newline is in the format string?
...ush after the call unless a newline is in the format string? Is this POSIX behavior? How might I have printf immediately flush every time?
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How to check the extension of a filename in a bash script?
I am writing a nightly build script in bash.
Everything is fine and dandy except for one little snag:
9 Answers
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Re-doing a reverted merge in Git
I have run into a bit of a problem here: I had a problem-specific branch 28s in Git, that I merged in the general develop branch. Turns out I had done it too fast, so I used git-revert to undo the merge. Now, however, the time has come to merge 28s into develop , but git-merge command sees th...
Set cookie and get cookie with JavaScript [duplicate]
...ptions, and different CSS files as values. When I choose a file, it should be saved to a cookie for about a week. The next time you open your HTML file, it should be the previous file you've chosen.
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How to convert strings into integers in Python?
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int() is the Python standard built-in function to convert a string into an integer value. You call it with a string containing a number as the argument, and it returns the number converted to an integer:
print (int("1") + 1)
The above prints 2.
If yo...