32 lines
688 B
Rust
32 lines
688 B
Rust
use std::ops::Deref;
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use crate::{InputType, InputValueError};
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pub fn max_items<T: Deref<Target = [E]> + InputType, E>(
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value: &T,
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len: usize,
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) -> Result<(), InputValueError<T>> {
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if value.deref().len() <= len {
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Ok(())
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} else {
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Err(format!(
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"the value length is {}, must be less than or equal to {}",
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value.deref().len(),
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len
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)
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.into())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_max_items() {
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assert!(max_items(&vec![1, 2], 3).is_ok());
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assert!(max_items(&vec![1, 2, 3], 3).is_ok());
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assert!(max_items(&vec![1, 2, 3, 4], 3).is_err());
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}
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}
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