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-rw-r--r--test/method.go307
1 files changed, 307 insertions, 0 deletions
diff --git a/test/method.go b/test/method.go
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+// run
+
+// Copyright 2009 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 simple methods of various types, with pointer and
+// value receivers.
+
+package main
+
+type S string
+type S1 string
+type I int
+type I1 int
+type T struct {
+ x int
+}
+type T1 T
+
+func (s S) val() int { return 1 }
+func (s *S1) val() int { return 2 }
+func (i I) val() int { return 3 }
+func (i *I1) val() int { return 4 }
+func (t T) val() int { return 7 }
+func (t *T1) val() int { return 8 }
+
+type Val interface {
+ val() int
+}
+
+func val(v Val) int { return v.val() }
+
+func main() {
+ var s S
+ var ps *S1
+ var i I
+ var pi *I1
+ var pt *T1
+ var t T
+ var v Val
+
+ if s.val() != 1 {
+ println("s.val:", s.val())
+ panic("fail")
+ }
+ if S.val(s) != 1 {
+ println("S.val(s):", S.val(s))
+ panic("fail")
+ }
+ if (*S).val(&s) != 1 {
+ println("(*S).val(s):", (*S).val(&s))
+ panic("fail")
+ }
+ if ps.val() != 2 {
+ println("ps.val:", ps.val())
+ panic("fail")
+ }
+ if (*S1).val(ps) != 2 {
+ println("(*S1).val(ps):", (*S1).val(ps))
+ panic("fail")
+ }
+ if i.val() != 3 {
+ println("i.val:", i.val())
+ panic("fail")
+ }
+ if I.val(i) != 3 {
+ println("I.val(i):", I.val(i))
+ panic("fail")
+ }
+ if (*I).val(&i) != 3 {
+ println("(*I).val(&i):", (*I).val(&i))
+ panic("fail")
+ }
+ if pi.val() != 4 {
+ println("pi.val:", pi.val())
+ panic("fail")
+ }
+ if (*I1).val(pi) != 4 {
+ println("(*I1).val(pi):", (*I1).val(pi))
+ panic("fail")
+ }
+ if t.val() != 7 {
+ println("t.val:", t.val())
+ panic("fail")
+ }
+ if pt.val() != 8 {
+ println("pt.val:", pt.val())
+ panic("fail")
+ }
+ if (*T1).val(pt) != 8 {
+ println("(*T1).val(pt):", (*T1).val(pt))
+ panic("fail")
+ }
+
+ if val(s) != 1 {
+ println("val(s):", val(s))
+ panic("fail")
+ }
+ if val(ps) != 2 {
+ println("val(ps):", val(ps))
+ panic("fail")
+ }
+ if val(i) != 3 {
+ println("val(i):", val(i))
+ panic("fail")
+ }
+ if val(pi) != 4 {
+ println("val(pi):", val(pi))
+ panic("fail")
+ }
+ if val(t) != 7 {
+ println("val(t):", val(t))
+ panic("fail")
+ }
+ if val(pt) != 8 {
+ println("val(pt):", val(pt))
+ panic("fail")
+ }
+
+ if Val.val(i) != 3 {
+ println("Val.val(i):", Val.val(i))
+ panic("fail")
+ }
+ v = i
+ if Val.val(v) != 3 {
+ println("Val.val(v):", Val.val(v))
+ panic("fail")
+ }
+
+ var zs struct{ S }
+ var zps struct{ *S1 }
+ var zi struct{ I }
+ var zpi struct{ *I1 }
+ var zpt struct{ *T1 }
+ var zt struct{ T }
+ var zv struct{ Val }
+
+ if zs.val() != 1 {
+ println("zs.val:", zs.val())
+ panic("fail")
+ }
+ if zps.val() != 2 {
+ println("zps.val:", zps.val())
+ panic("fail")
+ }
+ if zi.val() != 3 {
+ println("zi.val:", zi.val())
+ panic("fail")
+ }
+ if zpi.val() != 4 {
+ println("zpi.val:", zpi.val())
+ panic("fail")
+ }
+ if zt.val() != 7 {
+ println("zt.val:", zt.val())
+ panic("fail")
+ }
+ if zpt.val() != 8 {
+ println("zpt.val:", zpt.val())
+ panic("fail")
+ }
+
+ if val(zs) != 1 {
+ println("val(zs):", val(zs))
+ panic("fail")
+ }
+ if val(zps) != 2 {
+ println("val(zps):", val(zps))
+ panic("fail")
+ }
+ if val(zi) != 3 {
+ println("val(zi):", val(zi))
+ panic("fail")
+ }
+ if val(zpi) != 4 {
+ println("val(zpi):", val(zpi))
+ panic("fail")
+ }
+ if val(zt) != 7 {
+ println("val(zt):", val(zt))
+ panic("fail")
+ }
+ if val(zpt) != 8 {
+ println("val(zpt):", val(zpt))
+ panic("fail")
+ }
+
+ zv.Val = zi
+ if zv.val() != 3 {
+ println("zv.val():", zv.val())
+ panic("fail")
+ }
+
+ if (&zs).val() != 1 {
+ println("(&zs).val:", (&zs).val())
+ panic("fail")
+ }
+ if (&zps).val() != 2 {
+ println("(&zps).val:", (&zps).val())
+ panic("fail")
+ }
+ if (&zi).val() != 3 {
+ println("(&zi).val:", (&zi).val())
+ panic("fail")
+ }
+ if (&zpi).val() != 4 {
+ println("(&zpi).val:", (&zpi).val())
+ panic("fail")
+ }
+ if (&zt).val() != 7 {
+ println("(&zt).val:", (&zt).val())
+ panic("fail")
+ }
+ if (&zpt).val() != 8 {
+ println("(&zpt).val:", (&zpt).val())
+ panic("fail")
+ }
+
+ if val(&zs) != 1 {
+ println("val(&zs):", val(&zs))
+ panic("fail")
+ }
+ if val(&zps) != 2 {
+ println("val(&zps):", val(&zps))
+ panic("fail")
+ }
+ if val(&zi) != 3 {
+ println("val(&zi):", val(&zi))
+ panic("fail")
+ }
+ if val(&zpi) != 4 {
+ println("val(&zpi):", val(&zpi))
+ panic("fail")
+ }
+ if val(&zt) != 7 {
+ println("val(&zt):", val(&zt))
+ panic("fail")
+ }
+ if val(&zpt) != 8 {
+ println("val(&zpt):", val(&zpt))
+ panic("fail")
+ }
+
+ zv.Val = &zi
+ if zv.val() != 3 {
+ println("zv.val():", zv.val())
+ panic("fail")
+ }
+
+ promotion()
+}
+
+type A struct{ B }
+type B struct {
+ C
+ *D
+}
+type C int
+
+func (C) f() {} // value receiver, direct field of A
+func (*C) g() {} // pointer receiver
+
+type D int
+
+func (D) h() {} // value receiver, indirect field of A
+func (*D) i() {} // pointer receiver
+
+func expectPanic() {
+ if r := recover(); r == nil {
+ panic("expected nil dereference")
+ }
+}
+
+func promotion() {
+ var a A
+ // Addressable value receiver.
+ a.f()
+ a.g()
+ func() {
+ defer expectPanic()
+ a.h() // dynamic error: nil dereference in a.B.D->f()
+ }()
+ a.i()
+
+ // Non-addressable value receiver.
+ A(a).f()
+ // A(a).g() // static error: cannot call pointer method on A literal.B.C
+ func() {
+ defer expectPanic()
+ A(a).h() // dynamic error: nil dereference in A().B.D->f()
+ }()
+ A(a).i()
+
+ // Pointer receiver.
+ (&a).f()
+ (&a).g()
+ func() {
+ defer expectPanic()
+ (&a).h() // dynamic error: nil deref: nil dereference in (&a).B.D->f()
+ }()
+ (&a).i()
+
+ c := new(C)
+ c.f() // makes a copy
+ c.g()
+}