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Sorting a vector in descending order
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Actually, the first one is a bad idea. Use either the second one, or this:
struct greater
{
template<class T>
bool operator()(T const &a, T const &b) const { return a > b; }
};
std::sort(numbers.begin(), numbers.end(), greater(...
How to set an iframe src attribute from a variable in AngularJS
I'm trying to set the src attribute of an iframe from a variable and I can't get it to work...
6 Answers
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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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C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
...omic>
#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...
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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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 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...
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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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...