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How do I use extern to share variables between source files?
...e to contain an extern declaration of the variable.
The header is included by the one source file that defines the variable
and by all the source files that reference the variable.
For each program, one source file (and only one source file) defines the
variable.
Similarly, one header file (and only...
How to set Python's default version to 3.x on OS X?
...
You can solve it by symbolic link.
unlink /usr/local/bin/python
ln -s /usr/local/bin/python3.3 /usr/local/bin/python
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Downcasting shared_ptr to shared_ptr?
...
You can use dynamic_pointer_cast. It is supported by std::shared_ptr.
std::shared_ptr<Base> base (new Derived());
std::shared_ptr<Derived> derived =
std::dynamic_pointer_cast<Derived> (base);
Documentation: https://en.cppreference.com/w/cp...
Git pull after forced update
...ou simply:
git checkout some-branch # where some-branch can be replaced by any other branch
git branch base-branch -D # where base-branch is the one with the squashed commits
git checkout -b base-branch origin/base-branch # recreating branch with correct commits
Note: You can combine these al...
How to organize a node app that uses sequelize?
... You don't need that singleton thingy. Every module in nodejs is singleton by itself, so all this makes is pretty complex for no reason.
You should see Farm's answer! (The link to the article is broken, but I'll fix it with this official sample from sequelize: https://github.com/sequelize/express-...
What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...so that you can sort it using `sorted()`
sorted(df.values.tolist()) # Sort by key
Or:
# Sort by value:
from operator import itemgetter
sorted(df.values.tolist(), key=itemgetter(1))
[out]:
[['a', 1], ['b', 2], ['c', 3], ['d', 4], ['e', 5]]
Lastly, cast the list of list of 2 elements into a di...
What Android tools and methods work best to find memory/resource leaks? [closed]
...aps.
Bitmaps on the previous activity layout are not properly deallocated by the garbage collector because they have crossed references to their activity. After many experiments I found a quite good solution for this problem.
First, set the “id” attribute on the parent view of your XML layout:...
The Role Manager feature has not been enabled
...
You can do this by reading from the boolean property at:
System.Web.Security.Roles.Enabled
This is a direct read from the enabled attribute of the roleManager element in the web.config:
<configuration>
<system.web>
<...
Case insensitive regex in JavaScript
...reaching for "case insensitive regex", you can usually accomplish the same by just manipulating the case of the strings you are comparing:
const foo = 'HellO, WoRlD!';
const isFoo = 'hello, world!';
return foo.toLowerCase() === isFoo.toLowerCase();
I would also call this easier to read and grok the...
What's the purpose of git-mv?
...ves at a time, Git became confused and did not track the changes properly. By the way, in my experiments the same happened when I deleted/created files instead of using git mv. Proceed with care; you've been warned...
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