38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
// modified by Bevy contributors
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//! One way to the contents of an entity, as you might do for debugging. A similar pattern could
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//! also be useful for serialization, or other row-oriented generic operations.
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fn format_entity(entity: hecs::EntityRef<'_>) -> String {
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fn fmt<T: hecs::Component + std::fmt::Display>(entity: hecs::EntityRef<'_>) -> Option<String> {
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Some(entity.get::<T>()?.to_string())
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}
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const FUNCTIONS: &[&dyn Fn(hecs::EntityRef<'_>) -> Option<String>] =
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&[&fmt::<i32>, &fmt::<bool>, &fmt::<f64>];
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let mut out = String::new();
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for f in FUNCTIONS {
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if let Some(x) = f(entity) {
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if out.is_empty() {
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out.push_str("[");
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} else {
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out.push_str(", ");
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}
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out.push_str(&x);
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}
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}
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if out.is_empty() {
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out.push_str(&"[]");
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} else {
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out.push(']');
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}
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out
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}
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fn main() {
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let mut world = hecs::World::new();
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let e = world.spawn((42, true));
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println!("{}", format_entity(world.entity(e).unwrap()));
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}
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