Fixed the spelling mistakes and clarified some sentances

This commit is contained in:
Tanish-Eagle 2022-08-04 00:36:25 +05:30
parent 659d6aa04c
commit 42d4503930
1 changed files with 10 additions and 10 deletions

View File

@ -1,7 +1,7 @@
# Others
### Convert any type to String
To convert any type to `String`, you can simply the `ToString` trait for that type. Rather than doing that directly, you should implement the `fmt::Display` trait which will automatically provides `ToString` and also allows you to print the type with `println!`.
To convert any type to `String`, you can simply use the `ToString` trait for that type. Rather than doing that directly, you should implement the `fmt::Display` trait which will automatically provides `ToString` and also allows you to print the type with `println!`.
1. ๐ŸŒŸ๐ŸŒŸ
```rust,editable
@ -22,14 +22,14 @@ fn main() {
assert_eq!(origin.__, "The point is (0, 0)");
assert_eq!(format!(__), "The point is (0, 0)");
println!("Success!")
println!("Success!");
}
```
### Parse a String
2. ๐ŸŒŸ๐ŸŒŸ๐ŸŒŸ We can use `parse` method to convert a `String` into a `i32` number, this is becuase `FromStr` is implemented for `i32` type in standard library: `impl FromStr for i32`
2. ๐ŸŒŸ๐ŸŒŸ๐ŸŒŸ We can use `parse` method to convert a `String` into a `i32` number, this is because `FromStr` is implemented for `i32` type in standard library: `impl FromStr for i32`
```rust,editable
// To use `from_str` method, you needs to introduce this trait into the current scope.
// To use `from_str` method, you need to introduce this trait into the current scope.
use std::str::FromStr;
fn main() {
let parsed: i32 = "5".__.unwrap();
@ -38,7 +38,7 @@ fn main() {
let sum = parsed + turbo_parsed + from_str;
assert_eq!(sum, 35);
println!("Success!")
println!("Success!");
}
```
@ -74,14 +74,14 @@ fn main() {
let p = __;
assert_eq!(p.unwrap(), Point{ x: 3, y: 4} );
println!("Success!")
println!("Success!");
}
```
### Deref
You can find all the examples and exercises of the `Deref` trait [here](https://practice.rs/smart-pointers/deref.html).
### transmute
### Transmute
`std::mem::transmute` is a **unsafe function** can be used to reinterprets the bits of a value of one type as another type. Both of the original and the result types must have the same size and neither of them can be invalid.
`transmute` is semantically equivalent to a bitwise move of one type into another. It copies the bits from the source value into the destination value, then forgets the original, seems equivalent to C's `memcpy` under the hood.
@ -126,9 +126,9 @@ fn main() {
let num = unsafe { std::mem::transmute::<[u8; 4], u32>(raw_bytes) };
// use `u32::from_ne_bytes` instead
// Use `u32::from_ne_bytes` instead
let num = u32::from_ne_bytes(raw_bytes);
// or use `u32::from_le_bytes` or `u32::from_be_bytes` to specify the endianness
// Or use `u32::from_le_bytes` or `u32::from_be_bytes` to specify the endianness
let num = u32::from_le_bytes(raw_bytes);
assert_eq!(num, 0x12345678);
let num = u32::from_be_bytes(raw_bytes);
@ -150,7 +150,7 @@ fn main() {
let val_casts = unsafe { &mut *(ptr as *mut i32 as *mut u32) };
/*Turning an &str into a &[u8]: */
// this is not a good way to do this.
// This is not a good way to do this.
let slice = unsafe { std::mem::transmute::<&str, &[u8]>("Rust") };
assert_eq!(slice, &[82, 117, 115, 116]);