go iface_test 源码
golang iface_test 代码
文件路径：/src/cmd/compile/internal/test/iface_test.go
// 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 test
import "testing"
// Test to make sure we make copies of the values we
// put in interfaces.
var x int
func TestEfaceConv1(t *testing.T) {
a := 5
i := interface{}(a)
a += 2
if got := i.(int); got != 5 {
t.Errorf("wanted 5, got %d\n", got)
}
}
func TestEfaceConv2(t *testing.T) {
a := 5
sink = &a
i := interface{}(a)
a += 2
if got := i.(int); got != 5 {
t.Errorf("wanted 5, got %d\n", got)
}
}
func TestEfaceConv3(t *testing.T) {
x = 5
if got := e2int3(x); got != 5 {
t.Errorf("wanted 5, got %d\n", got)
}
}
//go:noinline
func e2int3(i interface{}) int {
x = 7
return i.(int)
}
func TestEfaceConv4(t *testing.T) {
a := 5
if got := e2int4(a, &a); got != 5 {
t.Errorf("wanted 5, got %d\n", got)
}
}
//go:noinline
func e2int4(i interface{}, p *int) int {
*p = 7
return i.(int)
}
type Int int
var y Int
type I interface {
foo()
}
func (i Int) foo() {
}
func TestIfaceConv1(t *testing.T) {
a := Int(5)
i := interface{}(a)
a += 2
if got := i.(Int); got != 5 {
t.Errorf("wanted 5, got %d\n", int(got))
}
}
func TestIfaceConv2(t *testing.T) {
a := Int(5)
sink = &a
i := interface{}(a)
a += 2
if got := i.(Int); got != 5 {
t.Errorf("wanted 5, got %d\n", int(got))
}
}
func TestIfaceConv3(t *testing.T) {
y = 5
if got := i2Int3(y); got != 5 {
t.Errorf("wanted 5, got %d\n", int(got))
}
}
//go:noinline
func i2Int3(i I) Int {
y = 7
return i.(Int)
}
func TestIfaceConv4(t *testing.T) {
a := Int(5)
if got := i2Int4(a, &a); got != 5 {
t.Errorf("wanted 5, got %d\n", int(got))
}
}
//go:noinline
func i2Int4(i I, p *Int) Int {
*p = 7
return i.(Int)
}
func BenchmarkEfaceInteger(b *testing.B) {
sum := 0
for i := 0; i < b.N; i++ {
sum += i2int(i)
}
sink = sum
}
//go:noinline
func i2int(i interface{}) int {
return i.(int)
}
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