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C++ performance challenge: integer to std::string conversion
...e important thing to do is to minimize the use of std::string. (Ironic, I know.) In Visual Studio, for example, most calls to methods of std::string are not inlined, even if you specify /Ob2 in compiler options. So even something as trivial as a call to std::string::clear(), which you might expect t...
Elegant Python function to convert CamelCase to snake_case?
...(r'(?<!^)(?=[A-Z])', '_', name).lower()
print(name) # camel_case_name
If you do this many times and the above is slow, compile the regex beforehand:
pattern = re.compile(r'(?<!^)(?=[A-Z])')
name = pattern.sub('_', name).lower()
To handle more advanced cases specially (this is not reversible...
How to get the return value from a thread in python?
...processing module has a nice interface for this using the Pool class. And if you want to stick with threads rather than processes, you can just use the multiprocessing.pool.ThreadPool class as a drop-in replacement.
def foo(bar, baz):
print 'hello {0}'.format(bar)
return 'foo' + baz
from mult...
Check if something is (not) in a list in Python
...in Python , and I have a conditional where I want to take the branch ONLY if the tuple is not in the list (if it is in the list, then I don't want to take the if branch)
...
Dynamically load a JavaScript file
...rary.js", type: "text/javascript"});
The problem here is that we do not know when the external script file is fully loaded.
We often want our dependant code on the very next line and like to write something like:
if (iNeedSomeMore) {
Script.load("myBigCodeLibrary.js"); // includes code for ...
How do I break out of a loop in Scala?
...although they act looplike, it's hard to come up with a consistent way to know what "break" and the like should do. So, to be consistent, the wiser thing to do is not to have a "break" at all.
Note: There are functional equivalents of all of these where you return the value of sum rather than muta...
Node.js - getting current filename
...
for a script named script.js, you'll get script.js. If you want to have the name only without extension, as we are speaking here of a js script you can use var scriptName = path.basename(__filename, '.js'); or var scriptName = path.basename(__filename, path.extname(__filename)...
What is the function __construct used for?
...structor).
You are not required to define a constructor in your class, but if you wish to pass any parameters on object construction then you need one.
An example could go like this:
class Database {
protected $userName;
protected $password;
protected $dbName;
public function __construct ...
How do I print a double value with full precision using cout?
So I've gotten the answer to my last question (I don't know why I didn't think of that). I was printing a double using cout that got rounded when I wasn't expecting it. How can I make cout print a double using full precision?
...
How do I get Gridview to render THEAD?
... GridView control to render the <thead> <tbody> tags? I know .UseAccessibleHeaders makes it put <th> instead of <td> , but I cant get the <thead> to appear.
...