Rust macro that uses GPT3 codex to generate code at compiletime.
Just describe what you want the function to do and (optionally) define a function header. The macro will generate the sourcecode for you at compiletime.
It can also generate tests for you. (See example 3)
create_function!("checks if number is prime" fn is_prime(num: u64) -> bool);will (usually) expand to something like:
// A rust function that checks if number is prime
fn is_prime(num: u64) -> bool {
if num == 2 {
return true;
}
if num % 2 == 0 {
return false;
}
let mut i = 3;
while i * i <= num {
if num % i == 0 {
return false;
}
i += 2;
}
true
}create_function!("prints n elements of the fibonnacci sequence to stdout" fn fib(n: u64));sometimes expands to:
// prints n elements of the fibonnacci sequence to stdout
fn fib (n : u64) {
let mut a = 0;
let mut b = 1;
let mut c = 0;
for _ in 0..n {
c = a + b;
a = b;
b = c;
println!("{}", c);
}
}create_function_and_tests!("fizzbuzz", fn fizzbuzz(n: u64) -> String)will often expand to:
// A rust function that fizzbuzz
fn fizzbuzz (n : u64) -> String {
if n % 15 == 0 {
"FizzBuzz".to_string()
} else if n % 3 == 0 {
"Fizz".to_string()
} else if n % 5 == 0 {
"Buzz".to_string()
} else {
n.to_string()
}
}
// 5 tests for the function
#[test]
fn test_fizzbuzz_1() {
assert_eq!(fizzbuzz(1), "1");
}
#[test]
fn test_fizzbuzz_2() {
assert_eq!(fizzbuzz(2), "2");
}
#[test]
fn test_fizzbuzz_3() {
assert_eq!(fizzbuzz(3), "Fizz");
}
#[test]
fn test_fizzbuzz_4() {
assert_eq!(fizzbuzz(4), "4");
}
#[test]
fn test_fizzbuzz_5() {
assert_eq!(fizzbuzz(5), "Buzz");
}| Pros | Cons |
|---|---|
| Spend less time coding simple utility functions and save your brainpower for the big problems | Compilation takes way longer |
| Create more readable sourcecode — the documentation IS the sourcode. | You need to be part of the GPT3 Codex private beta |
| A little nondeterminism during compilation is fun! | GPT3 Codex will not always be free :( |
Generate an OpenAI API key at the OpenAI Account Page and set the $OPENAI_KEY environment variable
Then execute
cargo add gpt3_macro
or manually add
gpt3_macro = "0.3.1"
to your Cargo.toml
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