2017-10-04 07:21:15 -05:00
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#![feature(test)]
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extern crate test;
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2019-11-23 00:06:27 -06:00
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use test::Bencher;
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// Static/dynamic method dispatch
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struct Struct {
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field: isize,
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}
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trait Trait {
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fn method(&self) -> isize;
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}
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impl Trait for Struct {
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fn method(&self) -> isize {
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self.field
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}
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}
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#[bench]
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fn trait_vtable_method_call(b: &mut Bencher) {
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let s = Struct { field: 10 };
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let t = &s as &dyn Trait;
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b.iter(|| t.method());
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}
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#[bench]
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fn trait_static_method_call(b: &mut Bencher) {
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let s = Struct { field: 10 };
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b.iter(|| s.method());
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}
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// Overhead of various match forms
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#[bench]
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fn option_some(b: &mut Bencher) {
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let x = Some(10);
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b.iter(|| match x {
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Some(y) => y,
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None => 11,
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});
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}
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#[bench]
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fn vec_pattern(b: &mut Bencher) {
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let x = [1, 2, 3, 4, 5, 6];
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b.iter(|| match x {
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[1, 2, 3, ..] => 10,
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_ => 11,
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});
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}
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