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Solving “Who owns the Zebra” programmatically?
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Here's a solution in Python based on constraint-programming:
from constraint import AllDifferentConstraint, InSetConstraint, Problem
# variables
colors = "blue red green white yellow".split()
nationalities = "Norwegian German Dane Swede Engli...
How do I create a variable number of variables?
...s that the only difference in each of those lines is a number that changes based on a rule, and decides to use a loop. However, they get stuck on how to dynamically create those variable names, and may try something like this:
for i in range(10):
my_calculator.('button_%d' % i) = tkinter.Button...
Odd behavior when Java converts int to byte?
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132 in digits (base 10) is 1000_0100 in bits (base 2) and Java stores int in 32 bits:
0000_0000_0000_0000_0000_0000_1000_0100
Algorithm for int-to-byte is left-truncate; Algorithm for System.out.println is two's-complement (Two's-compleme...
Safely override C++ virtual functions
I have a base class with a virtual function and I want to override that function in a derived class. Is there some way to make the compiler check if the function I declared in the derived class actually overrides a function in the base class? I would like to add some macro or something that ensures ...
Can “using” with more than one resource cause a resource leak?
...he same, lose attention and otherwise be at a greater loss. Just an advice based on personal experience.
– user1306322
Jan 15 '14 at 3:55
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What exactly does the enable-background attribute do?
... 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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What is the most ridiculous pessimization you've seen? [closed]
...bing 16 bits from RAM was quicker than grabbing 32 bits.
I had to write a demo program to show that grabbing 32-bit values on a 32-bit system was faster than grabbing 16-bit values, and explain that to grab a 16-bit value the CPU had to make a 32-bit wide memory access and then mask out or shift th...
What is the difference between Builder Design pattern and Factory Design pattern?
...but related kinds of object in one step, where the specific type is chosen based on given parameters. Think of the serialization system, where you create your serializer and it constructs the desired in object all in one load call.
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ASP.NET MVC: What is the purpose of @section? [closed]
...rms).
You might find Scott Gu's write up on this very interesting.
Edit: Based on additional question clarification
The @RenderSection syntax goes into the Shared View, such as:
<div id="sidebar">
@RenderSection("Sidebar", required: false)
</div>
This would then be placed in yo...
How to execute a raw update sql with dynamic binding in rails
...ing connection and using it's methods, e.g. for MySQL:
st = ActiveRecord::Base.connection.raw_connection.prepare("update table set f1=? where f2=? and f3=?")
st.execute(f1, f2, f3)
st.close
I'm not sure if there are other ramifications to doing this (connections left open, etc). I would trace the...