// Let's take a mutable piece of data, a 4-byte integer in this case
let mut some_data: u32 = 14;
// Create a mutable raw pointer pointing to the data above
let data_ptr: *mut u32 = &mut some_data as *mut u32;
// Note: creating a raw pointer is totally safe but dereferencing a raw pointe...
Unlike normal Rust references, raw pointers are allowed to take null values.
use std::ptr;
// Create a const NULL pointer
let null_ptr: *const u16 = ptr::null();
// Create a mutable NULL pointer
let mut_null_ptr: *mut u16 = ptr::null_mut();
Just like in C, Rust raw pointers can point to other raw pointers (which in turn may point to further raw pointers).
// Take a regular string slice
let planet: &str = "Earth";
// Create a constant pointer pointing to our string slice
let planet_ptr: *const &str = &planet ...
Rust has a default formatter for pointer types that can be used for displaying pointers.
use std::ptr;
// Create some data, a raw pointer pointing to it and a null pointer
let data: u32 = 42;
let raw_ptr = &data as *const u32;
let null_ptr = ptr::null() as *const u32;
// the {:p} mappi...
Overloading the addition operator (+) requires implement the std::ops::Add trait.
From the documentation, the full definition of the trait is:
pub trait Add<RHS = Self> {
type Output;
fn add(self, rhs: RHS) -> Self::Output;
}
How does it work?
the trait is implemented for...
Processing provides a method named line() to draw a line on the screen. This code draws a white 10 pixel line on black background.
void setup() {
size(500, 500);
background(0);
stroke(255);
strokeWeight(10);
}
void draw() {
line(0, 0, 500, 500);
}
The signature of m...
Heap sort is a comparison based sorting technique on binary heap data structure. It is similar to selection sort in which we first find the maximum element and put it at the end of the data structure. Then repeat the same process for the remaining items.
Pseudo code for Heap Sort:
function heapsor...
The following documentation describes both MySQLi and PDO supported pagination solution.
Go to https://github.com/rajdeeppaul/Pagination and download pagination.php file into your project directory. Let's say your directory structure looks like this:
project directory
|
|--paginati...
There are quite a number situations where one has huge amounts of data and using which he has to classify an object in to one of several known classes. Consider the following situations:
Banking: When a bank receives a request from a customer for a bankcard, the bank has to decide whether to issue...
Uses C standard format codes.
from datetime import datetime
datetime_for_string = datetime(2016,10,1,0,0)
datetime_string_format = '%b %d %Y, %H:%M:%S'
datetime.strftime(datetime_for_string,datetime_string_format)
# Oct 01 2016, 00:00:00
malloc() often calls underlying operating system functions to obtain pages of memory. But there is nothing special about the function and it can be implemented in straight C by declaring a large static array and allocating from it (there is a slight difficulty in ensuring correct alignment, in pract...
Let's say we have 8 houses. We want to setup telephone lines between these houses. The edge between the houses represent the cost of setting line between two houses.
Our task is to set up lines in such a way that all the houses are connected and the cost of setting up the whole connection is mini...
FullCalendar can be downloaded from it's website: https://fullcalendar.io/download/
from NPM:
$ npm install fullcalendar
from Bower:
$ bower install fullcalendar
or CDNJS:
//cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.0.1/fullcalendar.min.js
//cdnjs.cloudflare.com/ajax/libs/fullca...
Depending on your target machine, you need to choose a supported ROS Version (or vice-versa). Although ROS installation is well documented in the ROS wiki, It might be confusing to find them. So, here's a table of the ROS Version, target platforms & architecture and the links for the appropriate...
After enabling and creating migrations there might be a need to initially fill or migrate data in your database. There are several possibilities but for simple migrations you can use the method 'Seed()' in the file Configuration created after calling enable-migrations.
The Seed() function retrieves...
class Program
{
static void Main(string[] args)
{
//Initialize a new container
WindsorContainer container = new WindsorContainer();
//Register IService with a specific implementation and supply its dependencies
container.Register(Component.For<ISer...
