mirror of
https://github.com/golang/go
synced 2024-09-15 22:20:06 +00:00
501725032c
Up to this point, we were only handling typeparams that were converted to empty or non-empty interfaces. But we have a dictionary entry for each derived type (i.e. type derived from typeparams) as well. So, when doing a conversion, look for the source type in both the type params and derived types of the generic info, and then use the appropriate dictionary entry. Added some cases to ifaceconv.go (e.g. converting []T to an empty interface). Change-Id: I7bbad0128bec20ccccd93ae1d65c1ffd44ca79a0 Reviewed-on: https://go-review.googlesource.com/c/go/+/333011 Trust: Dan Scales <danscales@google.com> Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
// run -gcflags=-G=3
|
|
|
|
// Copyright 2021 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.
|
|
|
|
// Test that we can convert type parameters to both empty
|
|
// and nonempty interfaces, and named and nonnamed versions
|
|
// thereof.
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
type E interface{}
|
|
|
|
func f[T any](x T) interface{} {
|
|
var i interface{} = x
|
|
return i
|
|
}
|
|
|
|
func fs[T any](x T) interface{} {
|
|
y := []T{x}
|
|
var i interface{} = y
|
|
return i
|
|
}
|
|
|
|
func g[T any](x T) E {
|
|
var i E = x
|
|
return i
|
|
}
|
|
|
|
type C interface {
|
|
foo() int
|
|
}
|
|
|
|
type myInt int
|
|
|
|
func (x myInt) foo() int {
|
|
return int(x+1)
|
|
}
|
|
|
|
func h[T C](x T) interface{foo() int} {
|
|
var i interface{foo()int} = x
|
|
return i
|
|
}
|
|
func i[T C](x T) C {
|
|
var i C = x // conversion in assignment
|
|
return i
|
|
}
|
|
|
|
func j[T C](t T) C {
|
|
return C(t) // explicit conversion
|
|
}
|
|
|
|
func js[T any](x T) interface{} {
|
|
y := []T{x}
|
|
return interface{}(y)
|
|
}
|
|
|
|
func main() {
|
|
if got, want := f[int](7), 7; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := fs[int](7), []int{7}; got.([]int)[0] != want[0] {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := g[int](7), 7; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := h[myInt](7).foo(), 8; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := i[myInt](7).foo(), 8; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := j[myInt](7).foo(), 8; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := js[int](7), []int{7}; got.([]int)[0] != want[0] {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
}
|