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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...r various reasons. During compilation of your project, each .cpp file (usually) is compiled. In simple terms, this means the compiler will take your .cpp file, open any files #included by it, concatenate them all into one massive text file, and then perform syntax analysis and finally it will conv...
Comment Inheritance for C# (actually any language)
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Automatically generated docs seem like a very bad idea to me. They don't add any useful information but only blow up the code unnecessarily. If a tool can understand what a method does from its name, than a person can also understand ...
Writing a list to a file with Python
...ist:
print >> f, item
If you're keen on a single function call, at least remove the square brackets [], so that the strings to be printed get made one at a time (a genexp rather than a listcomp) -- no reason to take up all the memory required to materialize the whole list of strings....
Java 8 Distinct by property
...ey(Person::getName))
Note that if the stream is ordered and is run in parallel, this will preserve an arbitrary element from among the duplicates, instead of the first one, as distinct() does.
(This is essentially the same as my answer to this question: Java Lambda Stream Distinct() on arbitrary ...
How does #include work in C++? [duplicate]
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It is basically a header file that also includes every standard library and STL include file. The only purpose I can see for it would be for testing and education.
Se e.g. GCC 4.8.0 /bits/stdc++.h source.
Using it would include a lot ...
Python: Check if one dictionary is a subset of another larger dictionary
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Convert to item pairs and check for containment.
all(item in superset.items() for item in subset.items())
Optimization is left as an exercise for the reader.
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How do I remove a submodule?
...e about one or more submodules and wants to have it populated on the next call to "git submodule update".
But currently there is no easy way they can tell git they do not care about a submodule anymore and wants to get rid of the local work tree (unless the user knows a lot about submodule interna...
Running script upon login mac [closed]
...sking passwords, running other automator workflows at login time, conditionally run applications at login time and so on...
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Convert ArrayList to String[] array [duplicate]
...yped array can be of any size (new String[1] is valid), but if it is too small then the JVM will resize it on it's own.
– dhackner
Apr 6 '12 at 7:41
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How to name and retrieve a stash by name in git?
...apply by doing git stash apply stashname . But it seems that in this case all that happens is that stashname will be used as the stash description.
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