mirror of
https://github.com/golang/go
synced 2024-11-14 18:20:30 -07:00
33 lines
872 B
Go
33 lines
872 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2020 The Go Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import "reflect"
|
||
|
|
|
||
|
|
// complicated enough to require a compile-generated hash function
|
||
|
|
type K struct {
|
||
|
|
a, b int32 // these get merged by the compiler into a single field, something typehash doesn't do
|
||
|
|
c float64
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
k := K{a: 1, b: 2, c: 3}
|
||
|
|
|
||
|
|
// Make a reflect map.
|
||
|
|
m := reflect.MakeMap(reflect.MapOf(reflect.TypeOf(K{}), reflect.TypeOf(true)))
|
||
|
|
m.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(true))
|
||
|
|
|
||
|
|
// The binary must not contain the type map[K]bool anywhere, or reflect.MapOf
|
||
|
|
// will use that type instead of making a new one. So use an equivalent named type.
|
||
|
|
type M map[K]bool
|
||
|
|
var x M
|
||
|
|
reflect.ValueOf(&x).Elem().Set(m)
|
||
|
|
if !x[k] {
|
||
|
|
panic("key not found")
|
||
|
|
}
|
||
|
|
}
|