ruma_common/serde/
can_be_empty.rs

1//! Helpers for emptiness checks in `#[serde(skip_serializing_if)]`.
2
3/// Trait for types that have an "empty" state.
4///
5/// If `Default` is implemented for `Self`, `Self::default().is_empty()` should always be `true`.
6pub trait CanBeEmpty {
7    /// Check whether `self` is empty.
8    fn is_empty(&self) -> bool;
9}
10
11/// Check whether a value is empty.
12pub fn is_empty<T: CanBeEmpty>(val: &T) -> bool {
13    val.is_empty()
14}