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What are the rules about using an underscore in a C++ identifier?
...ifiers beginning with an underscore
Also, everything in the std namespace is reserved. (You are allowed to add template specializations, though.)
From the 2003 C++ Standard:
17.4.3.1.2 Global names [lib.global.names]
Certain sets of names and function signatures are always reserved to t...
Why can't Python's raw string literals end with a single backslash?
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The reason is explained in the part of that section which I highlighted in bold:
String quotes can be escaped with a
backslash, but the backslash remains
in the string; for example, r"\"" is a
valid string literal consisting o...
Check if current directory is a Git repository
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Copied from the bash completion file, the following is a naive way to do it
# Copyright (C) 2006,2007 Shawn O. Pearce <spearce@spearce.org>
# Conceptually based on gitcompletion (http://gitweb.hawaga.org.uk/).
# Distributed under the GNU General Public License, version ...
What is the C# equivalent of NaN or IsNumeric?
What is the most efficient way of testing an input string whether it contains a numeric value (or conversely Not A Number)? I guess I can use Double.Parse or a regex (see below) but I was wondering if there is some built in way to do this, such as javascript's NaN() or IsNumeric() (was that VB...
How to set timeout on python's socket recv method?
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The typical approach is to use select() to wait until data is available or until the timeout occurs. Only call recv() when data is actually available. To be safe, we also set the socket to non-blocking mode to guarantee that recv() will never b...
How to keep the console window open in Visual C++?
I'm starting out in Visual C++ and I'd like to know how to keep the console window.
22 Answers
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What is JavaScript garbage collection?
What is JavaScript garbage collection? What's important for a web programmer to understand about JavaScript garbage collection, in order to write better code?
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How to update a value, given a key in a hashmap?
..., map.get(key) + 1);
should be fine. It will update the value for the existing mapping. Note that this uses auto-boxing. With the help of map.get(key) we get the value of corresponding key, then you can update with your requirement. Here I am updating to increment value by 1.
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Is there a NumPy function to return the first index of something in an array?
I know there is a method for a Python list to return the first index of something:
13 Answers
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What is the fastest way to compare two sets in Java?
I am trying to optimize a piece of code which compares elements of list.
9 Answers
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