https://github.com/augustt198/macros

https://github.com/augustt198/macros

Last synced: about 2 months ago
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• Host: GitHub
• URL: https://github.com/augustt198/macros
• Owner: augustt198
• Created: 2014-10-19T19:11:24.000Z (about 10 years ago)
• Default Branch: master
• Last Pushed: 2014-10-29T22:43:09.000Z (about 10 years ago)
• Last Synced: 2023-08-02T15:35:23.972Z (over 1 year ago)
• Language: Rust
• Size: 160 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# macros

A collection of rust macros.

### Conditionals

The `maybe!` macro returns a random boolean when called with empty parameters:

```rust

let rand: bool = maybe!();

```

When called with a block/expression, the block/expression is called if a random boolean is true:

```rust

maybe! {

    println!("50%-50% chance")

}

```

### Repetition

The `repeat!` macro is called with the format: `repeat! {   times }`.

Multiple `  times` groupings can be placed together in a `repeat!` macro, when seperated by a comma.

```rust

repeat! {

   println!("Double, double, toil and trouble") 3 times

}

```

The `twice!` macro calls the supplied block/expression twice:

```rust

twice! {

    println!("Happy Birthday to You")

}

```

### Hash literal

The `hash!` macro creates an `std::collections::HashMap` from `key => value` pairs:

```rust

let hash = hash! {"January" => 0u, "February" => 1, "December" => 11};

```

### Ternary operator

Ternary operators have been removed from rust, but the `t!` macro can be used as a substitute using this syntax:

```rust

t! { conditional ? true_branch : false_branch }

```

For example:

```rust

let val = t! { maybe!() ? "yay" : "nay" }

```