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Swapping two variable value without using third variable
...algorithm
void xorSwap (int* x, int* y) {
if (x != y) { //ensure that memory locations are different
*x ^= *y;
*y ^= *x;
*x ^= *y;
}
}
Why the test?
The test is to ensure that x and y have different memory locations (rather than different values). This is because ...
Clone() vs Copy constructor- which is recommended in java [duplicate]
clone method vs copy constructor in java. which one is correct solution. where to use each case?
6 Answers
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How to make exe files from a node.js app?
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There a few alternatives, both free and commercial. I haven't used any of them but in theory they should work:
Iexpress (native windows tool)
Quick Batch File Compiler (commercial)
BoxedApp Packer
"Advanced" Batch To EXE Converter" (freeware)
Most will require you...
How to dismiss a Twitter Bootstrap popover by clicking outside?
Can we get popovers to be dismissable in the same way as modals, ie. make them close when user clicks somewhere outside of them?
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Efficient way to return a std::vector in c++
...t is, return by value.
With C++11, std::vector has move-semantics, which means the local vector declared in your function will be moved on return and in some cases even the move can be elided by the compiler.
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How to make a class conform to a protocol in Swift?
...iewDataSource'
Is expected. You will get the error until your class implements all required methods of the protocol.
So get coding :)
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Permanently adding a file path to sys.path in Python
...site-packages directory. On each line of the file you put one directory name, so you can put a line in there with /path/to/the/ and it will add that directory to the path.
You could also use the PYTHONPATH environment variable, which is like the system PATH variable but contains directories that w...
Image fingerprint to compare similarity of many images
...are every image to every other image very fast. I can't use binary compare methods because also images which are nearly similar should be recognized.
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What does it mean when an HTTP request returns status code 0?
What does it mean when JavaScript network calls such as fetch or XMLHttpRequest, or any other type of HTTP network request, fail with an HTTP status code of 0?
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How can I convert JSON to CSV?
...normally cannot be directly converted to CSV. You need to change that to something like this:
{
"pk": 22,
"model": "auth.permission",
"codename": "add_logentry",
"content_type": 8,
"name": "Can add log entry"
},
......]
Here is my code to generate CSV from that:
import csv
im...