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Fix size check when result length exceeds sum of inputs #7

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Fix size check when result length exceeds sum of inputs #7

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34 changes: 32 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,21 @@ macro_rules! concat_arrays_size {
}

/// Concatenates provided arrays.
///
/// The macro verifies that the combined length of the input arrays matches the length of the result array.
/// The examples below will fail to compile as the input arrays are either too short or too long.
/// ```compile_fail
/// # #[macro_use] extern crate array_concat;
/// # fn main() {
/// let c: [u32; 6] = concat_arrays!([1, 2, 3], [4, 5]); // too short
/// # }
/// ```
/// ```compile_fail
/// # #[macro_use] extern crate array_concat;
/// # fn main() {
/// let c: [u32; 6] = concat_arrays!([1, 2, 3], [4, 5, 6, 7]); // too long
/// # }
/// ```
#[macro_export]
macro_rules! concat_arrays {
($( $array:expr ),*) => ({
Expand Down Expand Up @@ -39,7 +54,7 @@ macro_rules! concat_arrays {
}

impl<T, A, B, const N: usize> ArrayConcatComposed<T, A, B, N> {
const PANIC: bool = $crate::_const_assert_same_size::<[T; N], Self>();
const PANIC: bool = $crate::_const_assert_same_size::<[T; N], ArrayConcatDecomposed::<T, A, B>>();

#[inline(always)]
const fn have_same_size(&self) -> bool {
Expand Down Expand Up @@ -89,6 +104,21 @@ macro_rules! flatten_split {
}

/// Split the provided array into the specified sizes.
///
/// The macro verifies that the length of the input array matches the combined length of the result arrays.
/// The examples below will fail to compile as the input array is either too short or too long.
/// ```compile_fail
/// # #[macro_use] extern crate array_concat;
/// # fn main() {
/// let (left, right): ([u32; 3], [u32; 4]) = split_array!([1, 2, 3, 4, 5, 6], 3, 4); // too short
/// # }
/// ```
/// ```compile_fail
/// # #[macro_use] extern crate array_concat;
/// # fn main() {
/// let (left, right): ([u32; 3], [u32; 2]) = split_array!([1, 2, 3, 4, 5, 6], 3, 2); // too long
/// # }
/// ```
#[macro_export]
macro_rules! split_array {
($array:expr, $size:expr) => ($array);
Expand Down Expand Up @@ -141,7 +171,7 @@ macro_rules! split_array {
}

impl<T, A, B, const N: usize> ArrayConcatComposed<T, A, B, N> {
const PANIC: bool = $crate::_const_assert_same_size::<[T; N], Self>();
const PANIC: bool = $crate::_const_assert_same_size::<[T; N], ArrayConcatDecomposed::<T, A, B>>();

#[inline(always)]
const fn have_same_size(&self) -> bool {
Expand Down