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CMake: Print out all accessible variables in a script
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I had to remove the STATUS from the message command for the output to be visible.
– luator
Feb 1 '18 at 12:28
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Rake just one migration
... To expand on what Ryan says, if the table has been dropped from the database outside of Rails, rake db:migrate:up VERSION=my_version may do nothing, because the schema_migrations table still says it is has been run. In the same situation rake db:migrate:redo VERSION=my_version may fa...
How can I access getSupportFragmentManager() in a fragment?
... fragManager = myContext.getSupportFragmentManager(); //If using fragments from support v4
or
FragmentManager fragManager = myContext.getFragmentManager();
You are done.
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Getting View's coordinates relative to the root layout
... if that works.
It should recursively just add the top and left positions from each parent container.
You could also implement it with a Point if you wanted.
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Choosing between std::map and std::unordered_map [duplicate]
...ook). This also manifests in other indirect ways like: (1) Start iterating from the iterator returned by find(), or (2) existence of member functions like lower_bound().
Also, I think there is some difference in the worst case search complexity.
For map, it is O( lg N )
For unordered_map, it is O...
Adding elements to object
...to use an object like this, is if you need to delete items. Deleting a key from an object is a lot easier than deleting a key from an array.
– bryc
Feb 11 '15 at 22:23
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Does const mean thread-safe in C++11?
...rary may result in a data race. In conclusion, const does mean thread-safe from the Standard Library point of view. It is important to note that this is merely a contract and it won't be enforced by the compiler, if you break it you get undefined behavior and you are on your own. Whether const is pr...
Press alt + numeric in bash and you get (arg [numeric]) what is that?
...for is:
"readline arguments"
This will lead to, for example, this chapter from the bash reference manual:
You can pass numeric arguments to Readline commands. Sometimes the argument acts as a repeat count, other times it is the sign of the argument that is significant. If you pass a negative argum...
Java rounding up to an int using Math.ceil
... don't want floor(a/b), but ceil(a/b), and using the definitions and plots from Wikipedia:
With these plots of the floor and ceil function you can see the relationship.
You can see that floor(x) <= ceil(x). We need floor(x + s) = ceil(x). So we need to find s. If we take 1/2 <= s < 1 it ...
deleting rows in numpy array
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The simplest way to delete rows and columns from arrays is the numpy.delete method.
Suppose I have the following array x:
x = array([[1,2,3],
[4,5,6],
[7,8,9]])
To delete the first row, do this:
x = numpy.delete(x, (0), axis=0)
To delete the thir...