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// run
// Copyright 2016 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 (
"fmt"
"io"
"os"
"reflect"
"unsafe"
)
type RWS struct{}
func (x *RWS) Read(p []byte) (n int, err error) { return }
func (x *RWS) Write(p []byte) (n int, err error) { return }
func (x *RWS) Seek(offset int64, whence int) (n int64, err error) { return }
func (x *RWS) String() string { return "rws" }
func makeRWS() io.ReadWriteSeeker { return &RWS{} }
func makeStringer() fmt.Stringer { return &RWS{} }
// Test correct construction of static empty interface values
var efaces = [...]struct {
x interface{}
s string
}{
{nil, "<nil> <nil>"},
{1, "int 1"},
{int(1), "int 1"},
{Int(int(2)), "main.Int Int=2"},
{int(Int(3)), "int 3"},
{[1]int{2}, "[1]int [2]"},
{io.Reader(io.ReadWriter(io.ReadWriteSeeker(nil))), "<nil> <nil>"},
{io.Reader(io.ReadWriter(io.ReadWriteSeeker(&RWS{}))), "*main.RWS rws"},
{makeRWS(), "*main.RWS rws"},
{map[string]string{"here": "there"}, "map[string]string map[here:there]"},
{chan bool(nil), "chan bool <nil>"},
{unsafe.Pointer(uintptr(0)), "unsafe.Pointer <nil>"},
{(*byte)(nil), "*uint8 <nil>"},
{io.Writer((*os.File)(nil)), "*os.File <nil>"},
{(interface{})(io.Writer((*os.File)(nil))), "*os.File <nil>"},
{fmt.Stringer(Strunger(((*Int)(nil)))), "*main.Int <nil>"},
}
type Int int
func (i Int) String() string { return fmt.Sprintf("Int=%d", i) }
func (i Int) Strung() {}
type Strunger interface {
fmt.Stringer
Strung()
}
// Test correct construction of static non-empty interface values
var ifaces = [...]struct {
x fmt.Stringer
s string
}{
{nil, "<nil> <nil> %!s(<nil>)"},
{Int(3), "main.Int 3 Int=3"},
{Int(int(Int(4))), "main.Int 4 Int=4"},
{Strunger(Int(5)), "main.Int 5 Int=5"},
{makeStringer(), "*main.RWS &main.RWS{} rws"},
{fmt.Stringer(nil), "<nil> <nil> %!s(<nil>)"},
{(*RWS)(nil), "*main.RWS (*main.RWS)(nil) rws"},
}
// Test correct handling of direct interface values
var (
one int = 1
iptr interface{} = &one
clos int
f interface{} = func() { clos++ }
deep interface{} = [1]struct{ a *[2]byte }{{a: &[2]byte{'z', 'w'}}}
ch interface{} = make(chan bool, 1)
)
func main() {
var fail bool
for i, test := range efaces {
s := fmt.Sprintf("%[1]T %[1]v", test.x)
if s != test.s {
fmt.Printf("eface(%d)=%q want %q\n", i, s, test.s)
fail = true
}
}
for i, test := range ifaces {
s := fmt.Sprintf("%[1]T %#[1]v %[1]s", test.x)
if s != test.s {
fmt.Printf("iface(%d)=%q want %q\n", i, s, test.s)
fail = true
}
}
if got := *(iptr.(*int)); got != 1 {
fmt.Printf("bad int ptr %d\n", got)
fail = true
}
f.(func())()
f.(func())()
f.(func())()
if clos != 3 {
fmt.Printf("bad closure exec %d\n", clos)
fail = true
}
if !reflect.DeepEqual(*(deep.([1]struct{ a *[2]byte })[0].a), [2]byte{'z', 'w'}) {
fmt.Printf("bad deep directiface\n")
fail = true
}
cc := ch.(chan bool)
cc <- true
if got := <-cc; !got {
fmt.Printf("bad chan\n")
fail = true
}
if fail {
fmt.Println("BUG")
os.Exit(1)
}
}
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