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What is the meaning of “POSIX”?
...ere else, notably not in GNU. But true, it is too restrictive, e.g. single letter flags only (e.g. -a), no double hyphen long versions (e.g. --all).
A few widely used conventions:
- means stdin where a file is expected
-- terminates flags, e.g. ls -- -l to list a directory named -l
See also: A...
Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?
...ling whitespace or \n) and a std::string is extracted, it will extract the letters from H to o, stop extracting, and then not set the EOF bit. In fact, it would set the EOF bit because it was the EOF that stopped the extraction. Just hoping to clear that up for people.
– Joseph...
How to iterate over rows in a DataFrame in Pandas
...n make arbitrarily complex things work through the simplicity and speed of raw Python code.
Caveats
List comprehensions assume that your data is easy to work with - what that means is your data types are consistent and you don't have NaNs, but this cannot always be guaranteed.
The first one is more...
What exactly do “IB” and “UB” mean?
...in the context of C++. I've tried googling them, but apparently those two-letter combinations see a lot of use. :P
5 Answ...
Version vs build in Xcode
...ame values.
When viewing the Info tab, if you right-click and select Show Raw Keys/Values, you'll see the actual names are CFBundleShortVersionString (Version) and CFBundleVersion (Build).
The Version is usually used how you appear to have been using it with Xcode 3. I'm not sure on what level you...
Is there a way to instantiate objects from a string holding their class name?
...igning to it. Have a look at its documentation here. Finally, the use of a raw function pointer is also a bit oldish. Modern C++ code should be decoupled from specific functions / types. You may want to look into Boost.Function to look for a better way. It would look like this then (the map):
typed...
How can I build a small operating system on an old desktop computer? [closed]
...le system yet ... not even partition table parsing; so we'd just deal with raw ranges of blocks on the disk at first).
At that point your boot loader should be able to pull new code across the serial line, dump it into a partition (yes, implement partition table handling of some sort ... whether it...
How are software license keys generated?
...IT
Windows XP takes quite a bit of information, encrypts it, and puts the letter/number encoding on a sticker. This allowed MS to both verify your key and obtain the product-type (Home, Professional, etc.) at the same time. Additionally, it requires online activation.
The full algorithm is rather...
Common MySQL fields and their appropriate data types
...p of numerical digits (and that's ignoring countries like Canada that have letters in their postcodes). So store them in a text field.
In MySQL you can use VARCHAR fields for this type of information. Whilst it sounds lazy, it means you don't have to be too concerned about the right minimum size.
...
How to remove convexity defects in a Sudoku square?
...gt; max_area:
max_area = area
best_cnt = cnt
cv2.drawContours(mask,[best_cnt],0,255,-1)
cv2.drawContours(mask,[best_cnt],0,0,2)
res = cv2.bitwise_and(res,mask)
Result :
3. Finding Vertical lines
kernelx = cv2.getStructuringElement(cv2.MORPH_RECT,(2,10))
dx = cv2.Sobe...