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How do I show the value of a #define at compile-time?
I am trying to figure out what version of Boost my code thinks it's using. I want to do something like this:
14 Answers
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Is there a difference between “raise exception()” and “raise exception” without parenthesis?
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Why do we need argc while there is always a null at the end of argv?
...uts(argv[i]);
}
return 0;
}
In standard C, with common warnings settings, unused parameter generates warning, which can be fixed by a statement like (void)argc; which causes the name to be used without generating any code.
argc is nice to have, because otherwise many programs would need ...
App Inventor 2 连接方式：AI伴侣、模拟器、USB · App Inventor 2 中文网
...ava写的安卓平台程序，可能未来待iOS平台成熟后，会有swift苹果版拓展。
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《App Inventor 2 连接：AI伴侣 + 模拟器 + USB（完整版）》
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Why do we need a pure virtual destructor in C++?
I understand the need for a virtual destructor. But why do we need a pure virtual destructor? In one of the C++ articles, the author has mentioned that we use pure virtual destructor when we want to make a class abstract.
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Why is there no Tree class in .NET?
...> : Dictionary<K, MyTree<K, V>>
{
public V Value { get; set; }
}
Or unkeyed:
public class MyTree<V> : HashSet<MyTree<V>>
{
public V Value { get; set; }
}
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How to compare two revisions in Bitbucket?
My team is using Bitbucket for our git repository and we've recently starting using the pull request functionality for code reviews. It works fine on the first review, but if it goes through multiple iterations (that is, changes are made and pull request updated), I would like to see a link with ju...
Load data from txt with pandas
I am loading a txt file containig a mix of float and string data. I want to store them in an array where I can access each element. Now I am just doing
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Remap values in pandas column with a dict
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You can use .replace. For example:
>>> df = pd.DataFrame({'col2': {0: 'a', 1: 2, 2: np.nan}, 'col1': {0: 'w', 1: 1, 2: 2}})
>>> di = {1: "A", 2: "B"}
>>> df
col1 col2
0 w a
1 1 2
2 2 NaN
>>> d...
How to prevent XSS with HTML/PHP?
...ges output.
Otherwise, use htmlentities($var, ENT_QUOTES | ENT_HTML5, $charset) and make sure the rest of your document uses the same character set as $charset. In most cases, 'UTF-8' is the desired character set.
Also, make sure you escape on output, not on input.
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