#Rust ๐Ÿฆ€ – Let’s create a Generic log() Function๐Ÿ‘

Hi !

Let’s create a generic log function. This will not make a lot of sense, since the println! function already support lots of data types. However, this is a nice way to understand how generics works.

Here is the log function.

use std::fmt::Display;

// Generic Function to print data to the console
fn console_log<T: Display>(x: T) {
    println!("{}", x);
}

The log function receives a parameter x, that support any type from Display, and then it prints the parameter to the console.

The following sample shows

  • Print a String
  • Print an Integer
  • Print a Struct, that implements a function to show the struct data

And the output is

output of the sample app
Hello World
123
Pet Name: Ace the Puppy - Age: 1

Source Code

/*
Copyright (c) 2023
Author : Bruno Capuano
Create Time : 2023 January
Change Log :
– Demos working with generics in Rust
The MIT License (MIT)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
use std::fmt::Display;
// Generic Function to print data to the console
fn console_log<T: Display>(x: T) {
println!("{}", x);
}
fn main() {
// create a new Pet named Ace
let ace = Pet {
name: String::from("Ace the Puppy"),
age: 1,
};
// print different types of data
console_log("Hello World");
console_log(123);
console_log(ace.log_pet_info());
}
struct Pet {
name: String,
age: u32,
}
// Player specific methods
impl Pet {
fn log_pet_info(self) -> String {
return format!("Pet Name: {} – Age: {}", self.name, self.age);
}
}

Super cool !

Happy coding!

Greetings

El Bruno

More posts in my blog ElBruno.com.


1 comment

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