mirror of
https://github.com/golang/go
synced 2024-09-06 00:19:45 +00:00
c0aa7bd760
- Create the stencil name using targ.Type.String(), which handles cases where, for example, a type argument is a pointer to a named type, etc. *obj. - Set name.Def properly for a new stenciled func (have the symbol point back to the associated function node). Will be required when exporting. - Add missing copying of Func field when making copies of Name nodes. (On purpose (it seems), Name nodes don't have a copy() function, so we have to copy all the needed fields explicitly.) - Deal with nil type in subster.node(), which is the type of the return value for a function that doesn't return anything. - Fix min to match standard want/go form, and add in float tests. Changed Got -> got in bunch of other typeparam tests. - Add new tests index.go, settable.go, and smallest.go (similar to examples in the type param proposal), some of which need the above changes. Change-Id: I09a72302bc1fd3635a326da92405222afa222e85 Reviewed-on: https://go-review.googlesource.com/c/go/+/291109 Trust: Dan Scales <danscales@google.com> Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
89 lines
1.6 KiB
Go
89 lines
1.6 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 method calls on type parameters
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"strconv"
|
|
)
|
|
|
|
// Simple constraint
|
|
type Stringer interface {
|
|
String() string
|
|
}
|
|
|
|
func stringify[T Stringer](s []T) (ret []string) {
|
|
for _, v := range s {
|
|
ret = append(ret, v.String())
|
|
}
|
|
return ret
|
|
}
|
|
|
|
type myint int
|
|
|
|
func (i myint) String() string {
|
|
return strconv.Itoa(int(i))
|
|
}
|
|
|
|
// Constraint with an embedded interface, but still only requires String()
|
|
type Stringer2 interface {
|
|
CanBeStringer2() int
|
|
SubStringer2
|
|
}
|
|
|
|
type SubStringer2 interface {
|
|
CanBeSubStringer2() int
|
|
String() string
|
|
}
|
|
|
|
func stringify2[T Stringer2](s []T) (ret []string) {
|
|
for _, v := range s {
|
|
ret = append(ret, v.String())
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func (myint) CanBeStringer2() int {
|
|
return 0
|
|
}
|
|
|
|
func (myint) CanBeSubStringer2() int {
|
|
return 0
|
|
}
|
|
|
|
// Test use of method values that are not called
|
|
func stringify3[T Stringer](s []T) (ret []string) {
|
|
for _, v := range s {
|
|
f := v.String
|
|
ret = append(ret, f())
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func main() {
|
|
x := []myint{myint(1), myint(2), myint(3)}
|
|
|
|
got := stringify(x)
|
|
want := []string{"1", "2", "3"}
|
|
if !reflect.DeepEqual(got, want) {
|
|
panic(fmt.Sprintf("got %s, want %s", got, want))
|
|
}
|
|
|
|
got = stringify2(x)
|
|
if !reflect.DeepEqual(got, want) {
|
|
panic(fmt.Sprintf("got %s, want %s", got, want))
|
|
}
|
|
|
|
got = stringify3(x)
|
|
if !reflect.DeepEqual(got, want) {
|
|
panic(fmt.Sprintf("got %s, want %s", got, want))
|
|
}
|
|
}
|