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reflect: add Type.ConvertibleTo, Value.Convert (API CHANGE)
Fixes #4047. R=iant, r CC=golang-dev https://golang.org/cl/6500065
This commit is contained in:
Russ Cox
parent
49aa74ef7f
commit
46f379cc2c
4 changed files with 814 additions and 4 deletions
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@ -7,6 +7,7 @@ package reflect_test
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import (
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"bytes"
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"encoding/base64"
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"flag"
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"fmt"
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"io"
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"math/rand"
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@ -1068,6 +1069,8 @@ type caseInfo struct {
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panic bool
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}
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var allselect = flag.Bool("allselect", false, "exhaustive select test")
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func TestSelect(t *testing.T) {
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selectWatch.once.Do(func() { go selectWatcher() })
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@ -1091,6 +1094,9 @@ func TestSelect(t *testing.T) {
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if testing.Short() && n >= 1000 {
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break
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}
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if n >= 100000 && !*allselect {
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break
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}
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if n%100000 == 0 && testing.Verbose() {
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println("TestSelect", n)
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}
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@ -2162,6 +2168,447 @@ func TestAlias(t *testing.T) {
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}
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}
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var V = ValueOf
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func EmptyInterfaceV(x interface{}) Value {
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return ValueOf(&x).Elem()
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}
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func ReaderV(x io.Reader) Value {
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return ValueOf(&x).Elem()
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}
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func ReadWriterV(x io.ReadWriter) Value {
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return ValueOf(&x).Elem()
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}
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type Empty struct{}
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type MyString string
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type MyBytes []byte
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type MyRunes []int32
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type MyFunc func()
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type MyByte byte
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var convertTests = []struct {
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in Value
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out Value
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}{
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// numbers
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/*
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Edit .+1,/\*\//-1>cat >/tmp/x.go && go run /tmp/x.go
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package main
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import "fmt"
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var numbers = []string{
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"int8", "uint8", "int16", "uint16",
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"int32", "uint32", "int64", "uint64",
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"int", "uint", "uintptr",
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"float32", "float64",
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}
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func main() {
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// all pairs but in an unusual order,
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// to emit all the int8, uint8 cases
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// before n grows too big.
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n := 1
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for i, f := range numbers {
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for _, g := range numbers[i:] {
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fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", f, n, g, n)
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n++
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if f != g {
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fmt.Printf("\t{V(%s(%d)), V(%s(%d))},\n", g, n, f, n)
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n++
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}
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}
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}
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}
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*/
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{V(int8(1)), V(int8(1))},
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{V(int8(2)), V(uint8(2))},
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{V(uint8(3)), V(int8(3))},
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{V(int8(4)), V(int16(4))},
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{V(int16(5)), V(int8(5))},
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{V(int8(6)), V(uint16(6))},
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{V(uint16(7)), V(int8(7))},
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{V(int8(8)), V(int32(8))},
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{V(int32(9)), V(int8(9))},
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{V(int8(10)), V(uint32(10))},
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{V(uint32(11)), V(int8(11))},
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{V(int8(12)), V(int64(12))},
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{V(int64(13)), V(int8(13))},
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{V(int8(14)), V(uint64(14))},
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{V(uint64(15)), V(int8(15))},
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{V(int8(16)), V(int(16))},
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{V(int(17)), V(int8(17))},
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{V(int8(18)), V(uint(18))},
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{V(uint(19)), V(int8(19))},
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{V(int8(20)), V(uintptr(20))},
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{V(uintptr(21)), V(int8(21))},
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{V(int8(22)), V(float32(22))},
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{V(float32(23)), V(int8(23))},
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{V(int8(24)), V(float64(24))},
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{V(float64(25)), V(int8(25))},
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{V(uint8(26)), V(uint8(26))},
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{V(uint8(27)), V(int16(27))},
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{V(int16(28)), V(uint8(28))},
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{V(uint8(29)), V(uint16(29))},
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{V(uint16(30)), V(uint8(30))},
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{V(uint8(31)), V(int32(31))},
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{V(int32(32)), V(uint8(32))},
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{V(uint8(33)), V(uint32(33))},
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{V(uint32(34)), V(uint8(34))},
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{V(uint8(35)), V(int64(35))},
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{V(int64(36)), V(uint8(36))},
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{V(uint8(37)), V(uint64(37))},
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{V(uint64(38)), V(uint8(38))},
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{V(uint8(39)), V(int(39))},
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{V(int(40)), V(uint8(40))},
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{V(uint8(41)), V(uint(41))},
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{V(uint(42)), V(uint8(42))},
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{V(uint8(43)), V(uintptr(43))},
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{V(uintptr(44)), V(uint8(44))},
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{V(uint8(45)), V(float32(45))},
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{V(float32(46)), V(uint8(46))},
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{V(uint8(47)), V(float64(47))},
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{V(float64(48)), V(uint8(48))},
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{V(int16(49)), V(int16(49))},
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{V(int16(50)), V(uint16(50))},
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{V(uint16(51)), V(int16(51))},
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{V(int16(52)), V(int32(52))},
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{V(int32(53)), V(int16(53))},
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{V(int16(54)), V(uint32(54))},
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{V(uint32(55)), V(int16(55))},
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{V(int16(56)), V(int64(56))},
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{V(int64(57)), V(int16(57))},
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{V(int16(58)), V(uint64(58))},
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{V(uint64(59)), V(int16(59))},
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{V(int16(60)), V(int(60))},
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{V(int(61)), V(int16(61))},
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{V(int16(62)), V(uint(62))},
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{V(uint(63)), V(int16(63))},
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{V(int16(64)), V(uintptr(64))},
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{V(uintptr(65)), V(int16(65))},
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{V(int16(66)), V(float32(66))},
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{V(float32(67)), V(int16(67))},
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{V(int16(68)), V(float64(68))},
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{V(float64(69)), V(int16(69))},
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{V(uint16(70)), V(uint16(70))},
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{V(uint16(71)), V(int32(71))},
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{V(int32(72)), V(uint16(72))},
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{V(uint16(73)), V(uint32(73))},
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{V(uint32(74)), V(uint16(74))},
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{V(uint16(75)), V(int64(75))},
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{V(int64(76)), V(uint16(76))},
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{V(uint16(77)), V(uint64(77))},
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{V(uint64(78)), V(uint16(78))},
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{V(uint16(79)), V(int(79))},
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{V(int(80)), V(uint16(80))},
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{V(uint16(81)), V(uint(81))},
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{V(uint(82)), V(uint16(82))},
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{V(uint16(83)), V(uintptr(83))},
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{V(uintptr(84)), V(uint16(84))},
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{V(uint16(85)), V(float32(85))},
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{V(float32(86)), V(uint16(86))},
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{V(uint16(87)), V(float64(87))},
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{V(float64(88)), V(uint16(88))},
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{V(int32(89)), V(int32(89))},
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{V(int32(90)), V(uint32(90))},
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{V(uint32(91)), V(int32(91))},
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{V(int32(92)), V(int64(92))},
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{V(int64(93)), V(int32(93))},
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{V(int32(94)), V(uint64(94))},
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{V(uint64(95)), V(int32(95))},
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{V(int32(96)), V(int(96))},
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{V(int(97)), V(int32(97))},
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{V(int32(98)), V(uint(98))},
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{V(uint(99)), V(int32(99))},
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{V(int32(100)), V(uintptr(100))},
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{V(uintptr(101)), V(int32(101))},
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{V(int32(102)), V(float32(102))},
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{V(float32(103)), V(int32(103))},
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{V(int32(104)), V(float64(104))},
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{V(float64(105)), V(int32(105))},
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{V(uint32(106)), V(uint32(106))},
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{V(uint32(107)), V(int64(107))},
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{V(int64(108)), V(uint32(108))},
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{V(uint32(109)), V(uint64(109))},
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{V(uint64(110)), V(uint32(110))},
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{V(uint32(111)), V(int(111))},
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{V(int(112)), V(uint32(112))},
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{V(uint32(113)), V(uint(113))},
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{V(uint(114)), V(uint32(114))},
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{V(uint32(115)), V(uintptr(115))},
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{V(uintptr(116)), V(uint32(116))},
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{V(uint32(117)), V(float32(117))},
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{V(float32(118)), V(uint32(118))},
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{V(uint32(119)), V(float64(119))},
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{V(float64(120)), V(uint32(120))},
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{V(int64(121)), V(int64(121))},
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{V(int64(122)), V(uint64(122))},
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{V(uint64(123)), V(int64(123))},
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{V(int64(124)), V(int(124))},
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{V(int(125)), V(int64(125))},
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{V(int64(126)), V(uint(126))},
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{V(uint(127)), V(int64(127))},
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{V(int64(128)), V(uintptr(128))},
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{V(uintptr(129)), V(int64(129))},
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{V(int64(130)), V(float32(130))},
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{V(float32(131)), V(int64(131))},
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{V(int64(132)), V(float64(132))},
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{V(float64(133)), V(int64(133))},
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{V(uint64(134)), V(uint64(134))},
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{V(uint64(135)), V(int(135))},
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{V(int(136)), V(uint64(136))},
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{V(uint64(137)), V(uint(137))},
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{V(uint(138)), V(uint64(138))},
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{V(uint64(139)), V(uintptr(139))},
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{V(uintptr(140)), V(uint64(140))},
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{V(uint64(141)), V(float32(141))},
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{V(float32(142)), V(uint64(142))},
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{V(uint64(143)), V(float64(143))},
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{V(float64(144)), V(uint64(144))},
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{V(int(145)), V(int(145))},
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{V(int(146)), V(uint(146))},
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{V(uint(147)), V(int(147))},
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{V(int(148)), V(uintptr(148))},
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{V(uintptr(149)), V(int(149))},
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{V(int(150)), V(float32(150))},
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{V(float32(151)), V(int(151))},
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{V(int(152)), V(float64(152))},
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{V(float64(153)), V(int(153))},
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{V(uint(154)), V(uint(154))},
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{V(uint(155)), V(uintptr(155))},
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{V(uintptr(156)), V(uint(156))},
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{V(uint(157)), V(float32(157))},
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{V(float32(158)), V(uint(158))},
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{V(uint(159)), V(float64(159))},
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{V(float64(160)), V(uint(160))},
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{V(uintptr(161)), V(uintptr(161))},
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{V(uintptr(162)), V(float32(162))},
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{V(float32(163)), V(uintptr(163))},
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{V(uintptr(164)), V(float64(164))},
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{V(float64(165)), V(uintptr(165))},
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{V(float32(166)), V(float32(166))},
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{V(float32(167)), V(float64(167))},
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{V(float64(168)), V(float32(168))},
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{V(float64(169)), V(float64(169))},
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// truncation
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{V(float64(1.5)), V(int(1))},
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// complex
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{V(complex64(1i)), V(complex64(1i))},
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{V(complex64(2i)), V(complex128(2i))},
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{V(complex128(3i)), V(complex64(3i))},
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{V(complex128(4i)), V(complex128(4i))},
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// string
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{V(string("hello")), V(string("hello"))},
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{V(string("bytes1")), V([]byte("bytes1"))},
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{V([]byte("bytes2")), V(string("bytes2"))},
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{V([]byte("bytes3")), V([]byte("bytes3"))},
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{V(string("runes♝")), V([]rune("runes♝"))},
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{V([]rune("runes♕")), V(string("runes♕"))},
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{V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
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{V(int('a')), V(string("a"))},
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{V(int8('a')), V(string("a"))},
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{V(int16('a')), V(string("a"))},
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{V(int32('a')), V(string("a"))},
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{V(int64('a')), V(string("a"))},
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{V(uint('a')), V(string("a"))},
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{V(uint8('a')), V(string("a"))},
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{V(uint16('a')), V(string("a"))},
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{V(uint32('a')), V(string("a"))},
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{V(uint64('a')), V(string("a"))},
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{V(uintptr('a')), V(string("a"))},
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{V(int(-1)), V(string("\uFFFD"))},
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{V(int8(-2)), V(string("\uFFFD"))},
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{V(int16(-3)), V(string("\uFFFD"))},
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{V(int32(-4)), V(string("\uFFFD"))},
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{V(int64(-5)), V(string("\uFFFD"))},
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{V(uint(0x110001)), V(string("\uFFFD"))},
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{V(uint32(0x110002)), V(string("\uFFFD"))},
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{V(uint64(0x110003)), V(string("\uFFFD"))},
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{V(uintptr(0x110004)), V(string("\uFFFD"))},
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// named string
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{V(MyString("hello")), V(string("hello"))},
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{V(string("hello")), V(MyString("hello"))},
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{V(string("hello")), V(string("hello"))},
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{V(MyString("hello")), V(MyString("hello"))},
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{V(MyString("bytes1")), V([]byte("bytes1"))},
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{V([]byte("bytes2")), V(MyString("bytes2"))},
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{V([]byte("bytes3")), V([]byte("bytes3"))},
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{V(MyString("runes♝")), V([]rune("runes♝"))},
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{V([]rune("runes♕")), V(MyString("runes♕"))},
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{V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
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{V([]rune("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))},
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{V(MyRunes("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
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{V(int('a')), V(MyString("a"))},
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{V(int8('a')), V(MyString("a"))},
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{V(int16('a')), V(MyString("a"))},
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{V(int32('a')), V(MyString("a"))},
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{V(int64('a')), V(MyString("a"))},
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{V(uint('a')), V(MyString("a"))},
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{V(uint8('a')), V(MyString("a"))},
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{V(uint16('a')), V(MyString("a"))},
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{V(uint32('a')), V(MyString("a"))},
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{V(uint64('a')), V(MyString("a"))},
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{V(uintptr('a')), V(MyString("a"))},
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{V(int(-1)), V(MyString("\uFFFD"))},
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{V(int8(-2)), V(MyString("\uFFFD"))},
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{V(int16(-3)), V(MyString("\uFFFD"))},
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{V(int32(-4)), V(MyString("\uFFFD"))},
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{V(int64(-5)), V(MyString("\uFFFD"))},
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{V(uint(0x110001)), V(MyString("\uFFFD"))},
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{V(uint32(0x110002)), V(MyString("\uFFFD"))},
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{V(uint64(0x110003)), V(MyString("\uFFFD"))},
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{V(uintptr(0x110004)), V(MyString("\uFFFD"))},
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// named []byte
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{V(string("bytes1")), V(MyBytes("bytes1"))},
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{V(MyBytes("bytes2")), V(string("bytes2"))},
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{V(MyBytes("bytes3")), V(MyBytes("bytes3"))},
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{V(MyString("bytes1")), V(MyBytes("bytes1"))},
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{V(MyBytes("bytes2")), V(MyString("bytes2"))},
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// named []rune
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{V(string("runes♝")), V(MyRunes("runes♝"))},
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{V(MyRunes("runes♕")), V(string("runes♕"))},
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{V(MyRunes("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))},
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{V(MyString("runes♝")), V(MyRunes("runes♝"))},
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{V(MyRunes("runes♕")), V(MyString("runes♕"))},
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// named types and equal underlying types
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{V(new(int)), V(new(integer))},
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{V(new(integer)), V(new(int))},
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{V(Empty{}), V(struct{}{})},
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{V(new(Empty)), V(new(struct{}))},
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{V(struct{}{}), V(Empty{})},
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{V(new(struct{})), V(new(Empty))},
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{V(Empty{}), V(Empty{})},
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{V(MyBytes{}), V([]byte{})},
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{V([]byte{}), V(MyBytes{})},
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{V((func())(nil)), V(MyFunc(nil))},
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{V((MyFunc)(nil)), V((func())(nil))},
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// can convert *byte and *MyByte
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{V((*byte)(nil)), V((*MyByte)(nil))},
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{V((*MyByte)(nil)), V((*byte)(nil))},
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|
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// cannot convert mismatched array sizes
|
||||
{V([2]byte{}), V([2]byte{})},
|
||||
{V([3]byte{}), V([3]byte{})},
|
||||
|
||||
// cannot convert other instances
|
||||
{V((**byte)(nil)), V((**byte)(nil))},
|
||||
{V((**MyByte)(nil)), V((**MyByte)(nil))},
|
||||
{V((chan byte)(nil)), V((chan byte)(nil))},
|
||||
{V((chan MyByte)(nil)), V((chan MyByte)(nil))},
|
||||
{V(([]byte)(nil)), V(([]byte)(nil))},
|
||||
{V(([]MyByte)(nil)), V(([]MyByte)(nil))},
|
||||
{V((map[int]byte)(nil)), V((map[int]byte)(nil))},
|
||||
{V((map[int]MyByte)(nil)), V((map[int]MyByte)(nil))},
|
||||
{V((map[byte]int)(nil)), V((map[byte]int)(nil))},
|
||||
{V((map[MyByte]int)(nil)), V((map[MyByte]int)(nil))},
|
||||
{V([2]byte{}), V([2]byte{})},
|
||||
{V([2]MyByte{}), V([2]MyByte{})},
|
||||
|
||||
// other
|
||||
{V((***int)(nil)), V((***int)(nil))},
|
||||
{V((***byte)(nil)), V((***byte)(nil))},
|
||||
{V((***int32)(nil)), V((***int32)(nil))},
|
||||
{V((***int64)(nil)), V((***int64)(nil))},
|
||||
{V((chan int)(nil)), V((<-chan int)(nil))},
|
||||
{V((chan int)(nil)), V((chan<- int)(nil))},
|
||||
{V((chan string)(nil)), V((<-chan string)(nil))},
|
||||
{V((chan string)(nil)), V((chan<- string)(nil))},
|
||||
{V((chan byte)(nil)), V((chan byte)(nil))},
|
||||
{V((chan MyByte)(nil)), V((chan MyByte)(nil))},
|
||||
{V((map[int]bool)(nil)), V((map[int]bool)(nil))},
|
||||
{V((map[int]byte)(nil)), V((map[int]byte)(nil))},
|
||||
{V((map[uint]bool)(nil)), V((map[uint]bool)(nil))},
|
||||
{V([]uint(nil)), V([]uint(nil))},
|
||||
{V([]int(nil)), V([]int(nil))},
|
||||
{V(new(interface{})), V(new(interface{}))},
|
||||
{V(new(io.Reader)), V(new(io.Reader))},
|
||||
{V(new(io.Writer)), V(new(io.Writer))},
|
||||
|
||||
// interfaces
|
||||
{V(int(1)), EmptyInterfaceV(int(1))},
|
||||
{V(string("hello")), EmptyInterfaceV(string("hello"))},
|
||||
{V(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))},
|
||||
{ReadWriterV(new(bytes.Buffer)), ReaderV(new(bytes.Buffer))},
|
||||
{V(new(bytes.Buffer)), ReadWriterV(new(bytes.Buffer))},
|
||||
}
|
||||
|
||||
func TestConvert(t *testing.T) {
|
||||
canConvert := map[[2]Type]bool{}
|
||||
all := map[Type]bool{}
|
||||
|
||||
for _, tt := range convertTests {
|
||||
t1 := tt.in.Type()
|
||||
if !t1.ConvertibleTo(t1) {
|
||||
t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t1)
|
||||
continue
|
||||
}
|
||||
|
||||
t2 := tt.out.Type()
|
||||
if !t1.ConvertibleTo(t2) {
|
||||
t.Errorf("(%s).ConvertibleTo(%s) = false, want true", t1, t2)
|
||||
continue
|
||||
}
|
||||
|
||||
all[t1] = true
|
||||
all[t2] = true
|
||||
canConvert[[2]Type{t1, t2}] = true
|
||||
|
||||
v1 := tt.in
|
||||
vout1 := v1.Convert(t1)
|
||||
out1 := vout1.Interface()
|
||||
if vout1.Type() != tt.in.Type() || !DeepEqual(out1, tt.in.Interface()) {
|
||||
t.Errorf("ValueOf(%T(%v)).Convert(%s) = %T(%v), want %T(%v)", tt.in.Interface(), tt.in.Interface(), t1, out1, out1, tt.in.Interface(), tt.in.Interface())
|
||||
}
|
||||
|
||||
vout := v1.Convert(t2)
|
||||
out := vout.Interface()
|
||||
if vout.Type() != tt.out.Type() || !DeepEqual(out, tt.out.Interface()) {
|
||||
t.Errorf("ValueOf(%T(%v)).Convert(%s) = %T(%v), want %T(%v)", tt.in.Interface(), tt.in.Interface(), t2, out, out, tt.out.Interface(), tt.out.Interface())
|
||||
}
|
||||
|
||||
if IsRO(v1) {
|
||||
t.Errorf("table entry %v is RO, should not be", v1)
|
||||
}
|
||||
if IsRO(vout1) {
|
||||
t.Errorf("self-conversion output %v is RO, should not be", vout1)
|
||||
}
|
||||
if IsRO(vout) {
|
||||
t.Errorf("conversion output %v is RO, should not be", vout)
|
||||
}
|
||||
if !IsRO(MakeRO(v1).Convert(t1)) {
|
||||
t.Errorf("RO self-conversion output %v is not RO, should be", v1)
|
||||
}
|
||||
if !IsRO(MakeRO(v1).Convert(t2)) {
|
||||
t.Errorf("RO conversion output %v is not RO, should be", v1)
|
||||
}
|
||||
}
|
||||
|
||||
// Assume that of all the types we saw during the tests,
|
||||
// if there wasn't an explicit entry for a conversion between
|
||||
// a pair of types, then it's not to be allowed. This checks for
|
||||
// things like 'int64' converting to '*int'.
|
||||
for t1 := range all {
|
||||
for t2 := range all {
|
||||
expectOK := t1 == t2 || canConvert[[2]Type{t1, t2}] || t2.Kind() == Interface && t2.NumMethod() == 0
|
||||
if ok := t1.ConvertibleTo(t2); ok != expectOK {
|
||||
t.Errorf("(%s).ConvertibleTo(%s) = %v, want %v", t1, t2, ok, expectOK)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type B1 struct {
|
||||
X int
|
||||
Y int
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue