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reflect: add MakeFunc (API CHANGE)

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Fixes #1765.

R=iant, r, daniel.morsing, minux.ma, bradfitz, rogpeppe, remyoudompheng
CC=golang-dev
https://golang.org/cl/6554067
This commit is contained in:
Russ Cox 2012-09-24 20:06:32 -04:00
parent 4b9e8415de
commit ba4625c66f
7 changed files with 377 additions and 7 deletions
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47
src/pkg/reflect/all_test.go
View file

@ -1394,23 +1394,56 @@ func fmtSelect(info []caseInfo) string {
return buf.String()
}
type two [2]uintptr
// Difficult test for function call because of
// implicit padding between arguments.
func dummy(b byte, c int, d byte) (i byte, j int, k byte) {
return b, c, d
func dummy(b byte, c int, d byte, e two, f byte, g float32, h byte) (i byte, j int, k byte, l two, m byte, n float32, o byte) {
return b, c, d, e, f, g, h
}
func TestFunc(t *testing.T) {
ret := ValueOf(dummy).Call([]Value{ValueOf(byte(10)), ValueOf(20), ValueOf(byte(30))})
if len(ret) != 3 {
t.Fatalf("Call returned %d values, want 3", len(ret))
ret := ValueOf(dummy).Call([]Value{
ValueOf(byte(10)),
ValueOf(20),
ValueOf(byte(30)),
ValueOf(two{40, 50}),
ValueOf(byte(60)),
ValueOf(float32(70)),
ValueOf(byte(80)),
})
if len(ret) != 7 {
t.Fatalf("Call returned %d values, want 7", len(ret))
}
i := byte(ret[0].Uint())
j := int(ret[1].Int())
k := byte(ret[2].Uint())
if i != 10 || j != 20 || k != 30 {
t.Errorf("Call returned %d, %d, %d; want 10, 20, 30", i, j, k)
l := ret[3].Interface().(two)
m := byte(ret[4].Uint())
n := float32(ret[5].Float())
o := byte(ret[6].Uint())
if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 {
t.Errorf("Call returned %d, %d, %d, %v, %d, %g, %d; want 10, 20, 30, [40, 50], 60, 70, 80", i, j, k, l, m, n, o)
}
}
func TestMakeFunc(t *testing.T) {
f := dummy
fv := MakeFunc(TypeOf(f), func(in []Value) []Value { return in })
ValueOf(&f).Elem().Set(fv)
// Call g with small arguments so that there is
// something predictable (and different from the
// correct results) in those positions on the stack.
g := dummy
g(1, 2, 3, two{4, 5}, 6, 7, 8)
// Call constructed function f.
i, j, k, l, m, n, o := f(10, 20, 30, two{40, 50}, 60, 70, 80)
if i != 10 || j != 20 || k != 30 || l != (two{40, 50}) || m != 60 || n != 70 || o != 80 {
t.Errorf("Call returned %d, %d, %d, %v, %d, %g, %d; want 10, 20, 30, [40, 50], 60, 70, 80", i, j, k, l, m, n, o)
}
}