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OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
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This is a recurring subject in Stackoverflow and since I was unable to find a relevant implementation I decided to accept the challenge.
I made some modifications to the squares demo present in OpenCV and the resulting C++ code below is able to detect a sheet...
Easy way to write contents of a Java InputStream to an OutputStream
I was surprised to find today that I couldn't track down any simple way to write the contents of an InputStream to an OutputStream in Java. Obviously, the byte buffer code isn't difficult to write, but I suspect I'm just missing something which would make my life easier (and the code clearer).
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Why generate long serialVersionUID instead of a simple 1L?
...rsionUID(1L) or generated serialVersionUID(3567653491060394677L) . I think that first one is cooler, but many times I saw people using the second option. Is there any reason to generate long serialVersionUID ?
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Finding the source code for built-in Python functions?
Is there a way to see how built in functions work in python? I don't mean just how to use them, but also how were they built, what is the code behind sorted or enumerate etc...?
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Can I find out the return value before returning while debugging in Visual Studio?
Take the following function:
20 Answers
20
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Get int value from enum in C#
...ral). In this class there is an enum called Question (singular) which looks like this.
28 Answers
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Is there any way to delete local commits in Mercurial?
So I keep making a silly mistake in Mercurial. Often times, I'll start work without doing an "hg pull" and an "hg update." When I try to push my changes, I get an error.
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CSS \9 in width property
What is the meaning of this? I am guessing it is a browser hack, but I have not been able to find what exactly it does.
4 A...
How can I check for Python version in a program that uses new language features?
... control early enough, you could split it into different .py files and check compatibility in the main file before importing (e.g. in __init__.py in a package):
# __init__.py
# Check compatibility
try:
eval("1 if True else 2")
except SyntaxError:
raise ImportError("requires ternary support")
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