29 lines
549 B
Rust
29 lines
549 B
Rust
// run-pass
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#![allow(dead_code)]
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#![feature(box_syntax)]
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#[derive(Copy, Clone)]
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struct LM { resize_at: usize, size: usize }
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enum HashMap<K,V> {
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HashMap_(LM, Vec<(K,V)>)
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}
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fn linear_map<K,V>() -> HashMap<K,V> {
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HashMap::HashMap_(LM{
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resize_at: 32,
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size: 0}, Vec::new())
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}
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impl<K,V> HashMap<K,V> {
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pub fn len(&mut self) -> usize {
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match *self {
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HashMap::HashMap_(ref l, _) => l.size
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}
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}
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}
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pub fn main() {
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let mut m: Box<_> = box linear_map::<(),()>();
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assert_eq!(m.len(), 0);
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}
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