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How to use the PI constant in C++
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On some (especially older) platforms (see the comments below) you might need to
#define _USE_MATH_DEFINES
and then include the necessary header file:
#include <math.h>
and the value of pi can be accessed via:
M_PI
In my math....
How to create the branch from specific commit in different branch
...f A, you won't get the changes introduced in B.
Same here, you had two parallel branches master and dev, which you merged in dev. Branching out from a commit of master (older than the merge) won't provide you with the changes of dev.
If you want to permanently integrate new changes from master i...
Flask SQLAlchemy query, specify column names
... do I specify the column that I want in my query using a model (it selects all columns by default)? I know how to do this with the sqlalchmey session: session.query(self.col1) , but how do I do it with with models? I can't do SomeModel.query() . Is there a way?
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How to use Git properly with Xcode?
...s with multiple developers.
The truth is that it's way more harmful to disallow merging of that .pbxproj file than it is helpful. As you say, when you add a file unless other people get that file, they have to also add it to their project - in an application of any size, that sucks and it also tak...
Difference between jQuery parent(), parents() and closest() functions
...p) the DOM tree.
parents() method is similar to parent() but selects all the
matching elements up the DOM tree. Begins from the parent element and travels up.
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Why use symbols as hash keys in Ruby?
...saves memory, because they are only stored once.
Symbols in Ruby are basically "immutable strings" .. that means that they can not be changed, and it implies that the same symbol when referenced many times throughout your source code, is always stored as the same entity, e.g. has the same object id...
What does the 'standalone' directive mean in XML?
... to tell the parser to ignore these rules.
Whether or not your parser actually does this is another question, but a standards-compliant validating parser (like a browser) should.
Note that if you do not specify a DTD, then the standalone declaration "has no meaning," so there's no reason to use it...
What exactly do “u” and “r” string flags do, and what are raw string literals?
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There's not really any "raw string"; there are raw string literals, which are exactly the string literals marked by an 'r' before the opening quote.
A "raw string literal" is a slightly different syntax for a string literal, in which a ba...
HEAD and ORIG_HEAD in Git
..., and it is a commit on top of which "git commit" would make a new one. Usually HEAD is symbolic reference to some other named branch; this branch is currently checked out branch, or current branch. HEAD can also point directly to a commit; this state is called "detached HEAD", and can be understood...
nil detection in Go
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In addition to Oleiade, see the spec on zero values:
When memory is allocated to store a value, either through a declaration or a call of make or new, and no explicit initialization is provided, the memory is given a default initialization. Each element of such a value is set to the zero valu...