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When do we have to use copy constructors?
...creating a separate worker thread
allocating a separate OpenGL framebuffer
etc
Self-registering objects
Consider a class where all objects - no matter how they have been constructed - MUST be somehow registered. Some examples:
The simplest example: maintaining the total count of currently exi...
Writing your own STL Container
...mplistic, skipping over many concepts like const_iterator, validity checks etc.
Code is runnable out of the box.
#include <iostream>
#include <string>
#include <vector>
template<typename T>
struct It
{
std::vector<T>& vec_;
int pointer_;
It(std::vec...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
...idea of thinking of 11011 as the polynomial with coefficients [1,1,0,1,1], etc. This is a clever and often useful idea, which goes all the way back to Euler. [See Wilf's awesome book "generatingfunctionology" for a modern exposition: math.upenn.edu/~wilf/DownldGF.html ] So it depends on whether the ...
Ioc/DI - Why do I have to reference all layers/assemblies in application's entry point?
...to a different project.
When you move all MVC related logic (controllers, etc) from the startup project to a class library, it allows this presentation layer assembly to stay disconnected from the rest of the application. Your web application project itself will become a very thin shell with a the ...
Android Camera Preview Stretched
...e screen. I have noticed, several popular apps such as Snapchat, WhatsApp, etc works the same way.
All you have to do is add this to the onMeasure method:
float camHeight = (int) (width * ratio);
float newCamHeight;
float newHeightRatio;
if (camHeight < height) {
newHeightR...
How are strings passed in .NET?
...hat produce modified versions of the string (substrings, trimmed versions, etc.) create modified copies of the original string.
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MySQL order by before group by
...by clause, or that are not used in an aggregate function (MIN, MAX, COUNT, etc.).
Correct use of extension to GROUP BY clause
This is useful when all values of non-aggregated columns are equal for every row.
For example, suppose you have a table GardensFlowers (name of the garden, flower that gro...
Do sealed classes really offer performance Benefits?
...can use call instead of callvirt as it doesn't have to check for virtuals, etc. As proven above, this is not true.
My next thought was that even though the MSIL is identical, perhaps the JIT compiler treats sealed classes differently?
I ran a release build under the visual studio debugger and view...
I need to securely store a username and password in Python, what are my options?
...B_FILE, 'w') as f:
pickle.dump(db, f)
def retrieve(key):
''' Fetch key-value pair.'''
return decrypt(db[key], getSaltForKey(key))
def require(key):
''' Test if key is stored, if not, prompt the user for it while hiding their input from shoulder-surfers.'''
if not key in db:...
What are type lambdas in Scala and what are their benefits?
..., another concrete type. Give List a String and it gives you List[String]. Etc.
So, List, Option can be considered to be type level functions of arity 1. Formally we say, they have a kind * -> *. The asterisk denotes a type.
Now Tuple2[_, _] is a type constructor with kind (*, *) -> * i.e. y...