summaryrefslogtreecommitdiffstats
path: root/test/interface/fake.go
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--test/interface/fake.go97
1 files changed, 97 insertions, 0 deletions
diff --git a/test/interface/fake.go b/test/interface/fake.go
new file mode 100644
index 0000000..861a640
--- /dev/null
+++ b/test/interface/fake.go
@@ -0,0 +1,97 @@
+// 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 interface comparisons using types hidden
+// inside reflected-on structs.
+
+package main
+
+import "reflect"
+
+type T struct {
+ F float32
+ G float32
+
+ S string
+ T string
+
+ U uint32
+ V uint32
+
+ W uint32
+ X uint32
+
+ Y uint32
+ Z uint32
+}
+
+func add(s, t string) string {
+ return s + t
+}
+
+func assert(b bool) {
+ if !b {
+ panic("assert")
+ }
+}
+
+func main() {
+ var x T
+ x.F = 1.0
+ x.G = x.F
+ x.S = add("abc", "def")
+ x.T = add("abc", "def")
+ x.U = 1
+ x.V = 2
+ x.W = 1 << 28
+ x.X = 2 << 28
+ x.Y = 0x12345678
+ x.Z = x.Y
+
+ // check mem and string
+ v := reflect.ValueOf(x)
+ i := v.Field(0)
+ j := v.Field(1)
+ assert(i.Interface() == j.Interface())
+
+ s := v.Field(2)
+ t := v.Field(3)
+ assert(s.Interface() == t.Interface())
+
+ // make sure different values are different.
+ // make sure whole word is being compared,
+ // not just a single byte.
+ i = v.Field(4)
+ j = v.Field(5)
+ assert(i.Interface() != j.Interface())
+
+ i = v.Field(6)
+ j = v.Field(7)
+ assert(i.Interface() != j.Interface())
+
+ i = v.Field(8)
+ j = v.Field(9)
+ assert(i.Interface() == j.Interface())
+}
+
+/*
+comparing uncomparable type float32
+throw: interface compare
+
+panic PC=0x28ceb8 [1]
+throw+0x41 /Users/rsc/goX/src/runtime/runtime.c:54
+ throw(0x3014a, 0x0)
+ifaceeq+0x15c /Users/rsc/goX/src/runtime/iface.c:501
+ ifaceeq(0x2aa7c0, 0x0, 0x0, 0x0, 0x2aa7c0, ...)
+sys·ifaceeq+0x48 /Users/rsc/goX/src/runtime/iface.c:527
+ sys·ifaceeq(0x2aa7c0, 0x0, 0x0, 0x0, 0x2aa7c0, ...)
+main·main+0x190 /Users/rsc/goX/src/cmd/gc/x.go:10
+ main·main()
+mainstart+0xf /Users/rsc/goX/src/runtime/amd64/asm.s:53
+ mainstart()
+sys·Goexit /Users/rsc/goX/src/runtime/proc.c:124
+ sys·Goexit()
+*/