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How to correctly implement custom iterators and const_iterators?
...ype of iterator which fits your container: input, output, forward etc.
Use base iterator classes from standard library. For example, std::iterator with random_access_iterator_tag.These base classes define all type definitions required by STL and do other work.
To avoid code duplication iterator clas...
Find object in list that has attribute equal to some value (that meets any condition)
...he best stand-alone way, but in case if you need to compare Test instances based on value somewhere else, this could be useful.
class Test:
def __init__(self, value):
self.value = value
def __eq__(self, other):
"""To implement 'in' operator"""
# Comparing with int (...
Is it ever advantageous to use 'goto' in a language that supports loops and functions? If so, why?
...on for people using the higher-level languages to jump all over their code base in twisted, contorted threads of execution that gave rise to the term "spaghetti code". You can see this by hopping on over to the classic Trek game written by Mike Mayfield and trying to figure out how things work. Ta...
Wrap a delegate in an IEqualityComparer
...g it). Clearly this may pose too severe a restriction, so you could make a base class without the constraint and a derived class with it.
Here's what the resulting code might look like:
public class KeyEqualityComparer<T, TKey> : IEqualityComparer<T>
{
protected readonly Func<T...
Adding a Method to an Existing Object Instance
...
My comment was based on this reference: python-reference.readthedocs.io/en/latest/docs/dunderdsc/… What I now see from official docs, it's optional: docs.python.org/3/howto/descriptor.html#descriptor-protocol
– Aida...
Read file from line 2 or skip header row
...he header information (in this example we simply tokenize the header lines based on the comma and return it as a list but there's room to do much more).
def __readheader(filehandle, numberheaderlines=1):
"""Reads the specified number of lines and returns the comma-delimited
strings on eac...
How to get the original value of an attribute in Rails
...ue that an ActiveRecord attribute (=the value that was loaded from the database)?
4 Answers
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Can I query MongoDB ObjectId by date?
...
Popping Timestamps into ObjectIds covers queries based on dates embedded in the ObjectId in great detail.
Briefly in JavaScript code:
/* This function returns an ObjectId embedded with a given datetime */
/* Accepts both Date object and string input */
function objectIdWit...
Cannot kill Python script with Ctrl-C
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Is it possible to declare two variables of different types in a for loop?
...e
C++14: You can do the same as C++11 (below) with the addition of type-based std::get. So instead of std::get<0>(t) in the below example, you can have std::get<int>(t).
C++11: std::make_pair allows you to do this, as well as std::make_tuple for more than two objects.
for (auto p ...