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What is the purpose of a question mark after a type (for example: int? myVariable)?
...<Int32>, pronounced "Nullable of Int32," can be assigned any
value from -2147483648 to 2147483647, or it can be assigned the null
value. A Nullable<bool> can be assigned the values true, false, or
null. The ability to assign null to numeric and Boolean types is
especially useful ...
Most simple but complete CMake example
...ngs, and parsed by the function implementation.
you can clone everything from github
cmake_minimum_required(VERSION 3.0)
project(example_project)
###############################################################################
## file globbing #####################################################...
Does ruby have real multithreading?
...JVM Threads as OS Threads and some
as Green Threads. (The mainstream JVMs from Sun/Oracle use exclusively OS threads since JDK 1.3)
XRuby also implements Ruby Threads as JVM Threads. Update: XRuby is dead.
IronRuby implements Ruby Threads as Native Threads,
where "Native Threads" in case of the CL...
How to declare a global variable in php?
...GLOBALS['a'] = 'localhost';
function body(){
echo $GLOBALS['a'];
}
From the Manual:
An associative array containing references to all variables which are currently defined in the global scope of the script. The variable names are the keys of the array.
If you have a set of functions ...
How to center a subview of UIView
...nd it will always work:
child.center = [parent convertPoint:parent.center fromView:parent.superview];
And for Swift:
child.center = parent.convert(parent.center, from:parent.superview)
share
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Get the distance between two geo points
... and last point but in a rectal line , so if you take any other directions from point a to b its gonna never be accuarated since the path is different, thats when distanceBetween joins in, you can save each distance between the points beign created and then with the final parameter results[] get the...
What exactly is Heroku?
...and performance
Isolation - each process (aka dyno) is completely isolated from each other
Full Logging and Visibility - easy access to all logging output from every component of your app and each process (dyno)
Heroku provides very well written tutorial which allows you to start in minutes. Also ...
Rails 3.1: Engine vs. Mountable App
...ull Engine
With a full engine, the parent application inherits the routes from the engine. It is not necessary to specify anything in parent_app/config/routes.rb. Specifying the gem in Gemfile is enough for the parent app to inherit the models, routes etc. The engine routes are specified as:
#...
How to “return an object” in C++?
...), and find what you can do to fix it. It likely won't be returning things from functions.
That said, if you're dead set on writing like that, you'd probably want to do the out parameter. It avoids dynamic memory allocation, which is safer and generally faster. It does require you have some way t...
How do you performance test JavaScript code?
... implement. I wonder, will the logging per se take some of the performance from the javascript execution. Let's say that we have a loop in a game and it outputs multiple log rows. For example once per second for 5 minutes, that is 300 rows. Anyone knows?
– K. Kilian Lindberg
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