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Does it make any sense to use inline keyword with templates?
...equirement in C++ that a function template must be implemented in a header file; it can be implemented anywhere. To reflect this, I tend to recommend tagging inline what is supposed to be inline. It usually makes no difference, but in standardese, they are not the same, and they are not all inline. ...
How do I check if a string is valid JSON in Python?
...wrong with it, just a noob mistake on my part. It appears I just cant call file.read() twice. But I can set a variable and use it. And thats what I did.
– Joey Blake
Apr 4 '11 at 15:23
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Is there a performance difference between i++ and ++i in C++?
...-O3 4.28 6.82
O(1) increment
Test
Let us now take the following file:
// c.cc
#include <array>
class Something {
public:
Something& operator++();
Something operator++(int);
private:
std::array<int,PACKET_SIZE> data;
};
Something& Something::operator++()
...
Should logger be private static or not
...
The most important difference is how it affects your log files: in which category do logs go?
In your first choice, the logs of a subclass end up in the category of the superclass. That seem very counter-intuitive to me.
There is a variant of your first case:
protected Log log =...
Xcode doesn't show the line that causes a crash
...and you are certain you are using the libraries correctly, then you should file a bug report to the maintainers of those libraries.
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How many Activities vs Fragments?
...ies, but it usually pays off. It means that you can use alternative layout files that define different fragment combinations, keep fragment code modular, simplify action bar management, and let the system handle all the back stack work.
...
Does use of final keyword in Java improve the performance?
...tion is a technique in which lines of code are not compiled into the class file based on a particular condition. This can be used to remove tons of debugging code in a production build.
consider the following:
public class ConditionalCompile {
private final static boolean doSomething= false;
...
What is the preferred/idiomatic way to insert into a map?
... system("pause");
}
This gives respectively for the versions (I ran the file 3 times, hence the 3 consecutive time differences for each):
map_W.insert(std::pair<int,Widget>(it,Widget(2.0)));
2198 ms, 2078 ms, 2072 ms
map_W_2.insert(std::make_pair(it,Widget(2.0)));
2290 ms, 2037 ms, 20...
How to create module-wide variables in Python? [duplicate]
...o do to make a module-global variable is just assign to a name.
Imagine a file called foo.py, containing this single line:
X = 1
Now imagine you import it.
import foo
print(foo.X) # prints 1
However, let's suppose you want to use one of your module-scope variables as a global inside a functi...
Override devise registrations controller
...This will create devise views in views/users folder
now in your route.rb file
devise_for :users, controllers: {
:sessions => "users/sessions",
:registrations => "users/registrations" }
You can add other controllers too. This will make devise to use controllers in use...