compact_str 0.1.0

A memory efficient immutable string type that transparently stores strings on the stack, when possible
Documentation 
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use std::{mem, sync::Arc};

use super::{HEAP_MASK, MAX_SIZE};

const PADDING_SIZE: usize = MAX_SIZE - mem::size_of::<Arc<str>>();
const PADDING: [u8; PADDING_SIZE] = [HEAP_MASK; PADDING_SIZE];

#[repr(C)]
#[derive(Debug, Clone)]
pub struct HeapString {
    pub padding: [u8; PADDING_SIZE],
    pub string: Arc<str>,
}

impl HeapString {
    pub fn new(text: &str) -> Self {
        let padding = PADDING;
        let string = text.into();

        HeapString { padding, string }
    }
}

static_assertions::assert_eq_size!(HeapString, String);