// return the next n permuations, if n>p.Left(),return all the left permuations
// if all permutaions generated or n is illegal(n<=0),return a empty slice
func (p *Permutator) NextN(count int) interface{} {
if count <= 0 || p.left() == 0 {
return reflect.MakeSlice(reflect.SliceOf(p.value.Type()), 0, 0).Interface()
}
cap := p.left()
if cap > count {
cap = count
}
result := reflect.MakeSlice(reflect.SliceOf(p.value.Type()), cap, cap)
length := 0
for index := 0; index < cap; index++ {
if _, ok := p.Next(); ok {
length++
list := p.copySliceValue()
result.Index(index).Set(list)
}
}
list := reflect.MakeSlice(result.Type(), length, length)
reflect.Copy(list, result)
return list.Interface()
}
// Remove removes the first occurence of the given val. It returns true
// if an element was removed, false otherwise. Note that the first argument
// must a pointer to a slice, while the second one must be a valid element
// of the slice. Otherwise, this function will panic.
func Remove(slicePtr interface{}, val interface{}) bool {
s := reflect.ValueOf(slicePtr)
if s.Kind() != reflect.Ptr || s.Type().Elem().Kind() != reflect.Slice {
panic(fmt.Errorf("first argument to Remove must be pointer to slice, not %T", slicePtr))
}
if s.IsNil() {
return false
}
itr := s.Elem()
v := reflect.ValueOf(val)
if itr.Type().Elem() != v.Type() {
panic(fmt.Errorf("second argument to Remove must be %s, not %s", itr.Type().Elem(), v.Type()))
}
vi := v.Interface()
for ii := 0; ii < itr.Len(); ii++ {
if reflect.DeepEqual(itr.Index(ii).Interface(), vi) {
newSlice := reflect.MakeSlice(itr.Type(), itr.Len()-1, itr.Len()-1)
reflect.Copy(newSlice, itr.Slice(0, ii))
reflect.Copy(newSlice.Slice(ii, newSlice.Len()), itr.Slice(ii+1, itr.Len()))
s.Elem().Set(newSlice)
return true
}
}
return false
}
func main() {
src := reflect.ValueOf([]int{1, 2, 3})
/* make sure the dest space is larger than src */
dest := reflect.ValueOf([]int{10, 20, 30})
cnt := reflect.Copy(dest, src)
data := dest.Interface().([]int)
data[0] = 100
fmt.Println(cnt)
fmt.Println(src)
fmt.Println(dest)
elmt := map[string]int{"age": 10}
data2 := make([]map[string]int, 1)
data2[0] = elmt
src2 := reflect.ValueOf(data2)
dest2 := reflect.ValueOf(make([]map[string]int, 1))
cnt2 := reflect.Copy(dest2, src2)
data2[0]["age"] = 100 /* they share the same map */
fmt.Println(cnt2)
fmt.Println(src2)
fmt.Println(dest2)
}
func (this *SpecificDatumReader) mapArray(field Schema, reflectField reflect.Value, dec Decoder) (reflect.Value, error) {
if arrayLength, err := dec.ReadArrayStart(); err != nil {
return reflect.ValueOf(arrayLength), err
} else {
array := reflect.MakeSlice(reflectField.Type(), 0, 0)
for {
arrayPart := reflect.MakeSlice(reflectField.Type(), int(arrayLength), int(arrayLength))
var i int64 = 0
for ; i < arrayLength; i++ {
val, err := this.readValue(field.(*ArraySchema).Items, arrayPart.Index(int(i)), dec)
if err != nil {
return reflect.ValueOf(arrayLength), err
}
if val.Kind() == reflect.Ptr {
arrayPart.Index(int(i)).Set(val.Elem())
} else {
arrayPart.Index(int(i)).Set(val)
}
}
//concatenate arrays
concatArray := reflect.MakeSlice(reflectField.Type(), array.Len()+int(arrayLength), array.Cap()+int(arrayLength))
reflect.Copy(concatArray, array)
reflect.Copy(concatArray, arrayPart)
array = concatArray
arrayLength, err = dec.ArrayNext()
if err != nil {
return reflect.ValueOf(arrayLength), err
} else if arrayLength == 0 {
break
}
}
return array, nil
}
}
func (s RSlice) overwrite(offset int, source *reflect.Value) {
if offset == 0 {
reflect.Copy(*s.Value, *source)
} else {
reflect.Copy(s.Slice(offset, s.Len()), *source)
}
}
//return the next n permuations, if n>p.Left(),return all the left permuations
//if all permutaions generated or n is illegal(n<=0),return a empty slice
func (p *Permutator) NextN(n int) interface{} {
<-p.idle
//if n<=0 or we generate all pemutations,just return a empty slice
if n <= 0 || p.left() == 0 {
p.idle <- true
return reflect.MakeSlice(reflect.SliceOf(p.value.Type()), 0, 0).Interface()
}
var i, j int
cap := p.left()
if cap > n {
cap = n
}
result := reflect.MakeSlice(reflect.SliceOf(p.value.Type()), cap, cap)
if p.length == 1 {
p.index++
l := reflect.MakeSlice(p.value.Type(), p.length, p.length)
reflect.Copy(l, p.value)
p.idle <- true
result.Index(0).Set(l)
return result.Interface()
}
if p.index == 1 {
p.index++
l := reflect.MakeSlice(p.value.Type(), p.length, p.length)
reflect.Copy(l, p.value)
result.Index(0).Set(l)
}
for k := 1; k < cap; k++ {
for i = p.length - 2; i >= 0; i-- {
if p.less(p.value.Index(i).Interface(), p.value.Index(i+1).Interface()) {
break
}
}
for j = p.length - 1; j >= 0; j-- {
if p.less(p.value.Index(i).Interface(), p.value.Index(j).Interface()) {
break
}
}
//swap
temp := reflect.ValueOf(p.value.Index(i).Interface())
p.value.Index(i).Set(p.value.Index(j))
p.value.Index(j).Set(temp)
//reverse
reverse(p.value, i+1, p.length-1)
//increase the counter
p.index++
l := reflect.MakeSlice(p.value.Type(), p.length, p.length)
reflect.Copy(l, p.value)
result.Index(k).Set(l)
}
p.idle <- true
return result.Interface()
}
func TestRaceReflectCopyWW(t *testing.T) {
ch := make(chan bool, 1)
a := make([]byte, 2)
v := reflect.ValueOf(a)
go func() {
reflect.Copy(v, v)
ch <- true
}()
reflect.Copy(v, v)
<-ch
}
// encodeFixedArray writes the XDR encoded representation of each element
// in the passed array represented by the reflection value to the encapsulated
// writer and returns the number of bytes written. The ignoreOpaque flag
// controls whether or not uint8 (byte) elements should be encoded individually
// or as a fixed sequence of opaque data.
//
// A MarshalError is returned if any issues are encountered while encoding
// the array elements.
//
// Reference:
// RFC Section 4.12 - Fixed-Length Array
// Individually XDR encoded array elements
func (enc *Encoder) encodeFixedArray(v reflect.Value, ignoreOpaque bool) (int, error) {
// Treat [#]byte (byte is alias for uint8) as opaque data unless ignored.
if !ignoreOpaque && v.Type().Elem().Kind() == reflect.Uint8 {
// Create a slice of the underlying array for better efficiency
// when possible. Can't create a slice of an unaddressable
// value.
if v.CanAddr() {
return enc.EncodeFixedOpaque(v.Slice(0, v.Len()).Bytes())
}
// When the underlying array isn't addressable fall back to
// copying the array into a new slice. This is rather ugly, but
// the inability to create a constant slice from an
// unaddressable array is a limitation of Go.
slice := make([]byte, v.Len(), v.Len())
reflect.Copy(reflect.ValueOf(slice), v)
return enc.EncodeFixedOpaque(slice)
}
// Encode each array element.
var n int
for i := 0; i < v.Len(); i++ {
n2, err := enc.encode(v.Index(i))
n += n2
if err != nil {
return n, err
}
}
return n, nil
}
func (fs *FlagSet) parseNextItem(args []string) ([]string, error) {
if strings.HasPrefix(args[0], "--") {
return fs.parseLongFlag(args)
} else if strings.HasPrefix(args[0], "-") {
return fs.parseShortFlagCluster(args)
}
if fs.Verbs != nil {
verb, ok := fs.Verbs[args[0]]
if !ok {
return args, fmt.Errorf("Unknown verb: %s", args[0])
}
err := verb.Parse(args[1:])
if err != nil {
return args, err
}
return []string{}, nil
}
if fs.remainderFlag != nil {
remainder := reflect.MakeSlice(fs.remainderFlag.value.Type(), len(args), len(args))
reflect.Copy(remainder, reflect.ValueOf(args))
fs.remainderFlag.value.Set(remainder)
return []string{}, nil
}
return args, fmt.Errorf("Invalid trailing arguments: %v", args)
}
func decodeSlice(d *decodeState, kind int, value reflect.Value) {
if kind != kindArray {
d.saveErrorAndSkip(kind, value.Type())
return
}
v := value.(*reflect.SliceValue)
t := v.Type().(*reflect.SliceType)
offset := d.beginDoc()
i := 0
for {
kind, _ := d.scanKindName()
if kind == 0 {
break
}
if i >= v.Cap() {
newcap := v.Cap() + v.Cap()/2
if newcap < 4 {
newcap = 4
}
newv := reflect.MakeSlice(t, v.Len(), newcap)
reflect.Copy(newv, v)
v.Set(newv)
}
if i >= v.Len() {
v.SetLen(i + 1)
}
d.decodeValue(kind, v.Elem(i))
i += 1
}
d.endDoc(offset)
}
/*
Create a new memory container and copy contents across to it.
Returns nil when reallocation fails.
*/
func Reallocate(container interface{}, length, capacity int) (r interface{}) {
switch c := container.(type) {
case Resizeable:
c.Reallocate(length, capacity)
r = c
default:
if c := reflect.ValueOf(container); c.Kind() == reflect.Slice {
if length > capacity {
length = capacity
}
if c.Cap() != capacity {
n := reflect.MakeSlice(c.Type(), length, capacity)
reflect.Copy(n, c)
c = n
}
if c.Len() != length {
c = makeAddressable(c)
c.SetLen(length)
}
r = c.Interface()
}
}
return
}
func encodeByteArray(b []byte, v reflect.Value) []byte {
n := v.Len()
if n < (0xec - 0xe0) {
b = append(b, byte(0xe0+n))
} else {
b = encodeK4(b, 0xec, uint64(n))
}
// Fast path for when the array is addressable (which it almost
// always will be).
if v.CanAddr() {
return append(b, v.Slice(0, n).Bytes()...)
}
i := len(b)
j := i + n
if j > cap(b) {
t := make([]byte, i, j)
copy(t, b)
b = t
}
reflect.Copy(reflect.ValueOf(b[i:j]), v)
return b[:j]
}
func ArraySort(data interface{}) interface{} {
//建立一份拷贝数据
dataValue := reflect.ValueOf(data)
dataType := dataValue.Type()
dataValueLen := dataValue.Len()
dataResult := reflect.MakeSlice(dataType, dataValueLen, dataValueLen)
reflect.Copy(dataResult, dataValue)
//排序
dataElemType := dataType.Elem()
var result interface{}
if dataElemType.Kind() == reflect.Int {
intArray := dataResult.Interface().([]int)
sort.Sort(sort.IntSlice(intArray))
result = intArray
} else if dataElemType.Kind() == reflect.String {
stringArray := dataResult.Interface().([]string)
sort.Sort(sort.StringSlice(stringArray))
result = stringArray
} else {
panic("invalid sort type " + fmt.Sprintf("%v", dataElemType))
}
return result
}
func (p *Decoder) unmarshalArray(pval *plistValue, val reflect.Value) {
subvalues := pval.value.([]*plistValue)
var n int
if val.Kind() == reflect.Slice {
// Slice of element values.
// Grow slice.
cnt := len(subvalues) + val.Len()
if cnt >= val.Cap() {
ncap := 2 * cnt
if ncap < 4 {
ncap = 4
}
new := reflect.MakeSlice(val.Type(), val.Len(), ncap)
reflect.Copy(new, val)
val.Set(new)
}
n = val.Len()
val.SetLen(cnt)
} else if val.Kind() == reflect.Array {
if len(subvalues) > val.Cap() {
panic(fmt.Errorf("plist: attempted to unmarshal %d values into an array of size %d", len(subvalues), val.Cap()))
}
} else {
panic(&incompatibleDecodeTypeError{val.Type(), pval.kind})
}
// Recur to read element into slice.
for _, sval := range subvalues {
p.unmarshal(sval, val.Index(n))
n++
}
return
}
func decodeSliceElems(s *Stream, val reflect.Value, elemdec decoder) error {
i := 0
for ; ; i++ {
// grow slice if necessary
if i >= val.Cap() {
newcap := val.Cap() + val.Cap()/2
if newcap < 4 {
newcap = 4
}
newv := reflect.MakeSlice(val.Type(), val.Len(), newcap)
reflect.Copy(newv, val)
val.Set(newv)
}
if i >= val.Len() {
val.SetLen(i + 1)
}
// decode into element
if err := elemdec(s, val.Index(i)); err == EOL {
break
} else if err != nil {
return addErrorContext(err, fmt.Sprint("[", i, "]"))
}
}
if i < val.Len() {
val.SetLen(i)
}
return nil
}
func copyAny(out, in reflect.Value) {
switch in.Kind() {
case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64,
reflect.String, reflect.Uint32, reflect.Uint64:
out.Set(in)
case reflect.Ptr:
if in.IsNil() {
return
}
out.Set(reflect.New(in.Type().Elem()))
copyAny(out.Elem(), in.Elem())
case reflect.Slice:
if in.IsNil() {
return
}
n := in.Len()
out.Set(reflect.MakeSlice(in.Type(), n, n))
switch in.Type().Elem().Kind() {
case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64,
reflect.String, reflect.Uint32, reflect.Uint64, reflect.Uint8:
reflect.Copy(out, in)
default:
for i := 0; i < n; i++ {
copyAny(out.Index(i), in.Index(i))
}
}
case reflect.Struct:
copyStruct(out, in)
default:
// unknown type, so not a protocol buffer
log.Printf("proto: don't know how to copy %v", in)
}
}
func setCustomType(base structPointer, f field, value interface{}) {
if value == nil {
return
}
v := reflect.ValueOf(value).Elem()
t := reflect.TypeOf(value).Elem()
kind := t.Kind()
switch kind {
case reflect.Slice:
slice := reflect.MakeSlice(t, v.Len(), v.Cap())
reflect.Copy(slice, v)
oldHeader := structPointer_GetSliceHeader(base, f)
oldHeader.Data = slice.Pointer()
oldHeader.Len = v.Len()
oldHeader.Cap = v.Cap()
default:
l := 1
size := reflect.TypeOf(value).Elem().Size()
if kind == reflect.Array {
l = reflect.TypeOf(value).Elem().Len()
size = reflect.TypeOf(value).Size()
}
total := int(size) * l
structPointer_Copy(toStructPointer(reflect.ValueOf(value)), structPointer_Add(base, f), total)
}
}
// grow grows the slice s so that it can hold extra more values, allocating
// more capacity if needed. It also returns the old and new slice lengths.
func grow(s reflect.Value, extra int) (reflect.Value, int, int) {
i0 := s.Len()
i1 := i0 + extra
if i1 < i0 {
panic("reflect.Append: slice overflow")
}
m := s.Cap()
if i1 <= m {
return s.Slice(0, i1), i0, i1
}
if m == 0 {
m = extra
} else {
for m < i1 {
if i0 < 1024 {
m += m
} else {
m += m / 4
}
}
}
t := reflect.MakeSlice(s.Type(), i1, m)
reflect.Copy(t, s)
return t, i0, i1
}
// set attempts to assign src to dst by either setting, copying or otherwise.
//
// set is a bit more lenient when it comes to assignment and doesn't force an as
// strict ruleset as bare `reflect` does.
func set(dst, src reflect.Value, output Argument) error {
dstType := dst.Type()
srcType := src.Type()
switch {
case dstType.AssignableTo(src.Type()):
dst.Set(src)
case dstType.Kind() == reflect.Array && srcType.Kind() == reflect.Slice:
if !dstType.Elem().AssignableTo(r_byte) {
return fmt.Errorf("abi: cannot unmarshal %v in to array of elem %v", src.Type(), dstType.Elem())
}
if dst.Len() < output.Type.SliceSize {
return fmt.Errorf("abi: cannot unmarshal src (len=%d) in to dst (len=%d)", output.Type.SliceSize, dst.Len())
}
reflect.Copy(dst, src)
case dstType.Kind() == reflect.Interface:
dst.Set(src)
case dstType.Kind() == reflect.Ptr:
return set(dst.Elem(), src, output)
default:
return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
}
return nil
}
// FormatSmart marshals value into a []byte according to the following rules:
// * string: untouched
// * bool: converted to `True` or `False` (to match pyjuju)
// * int or float: converted to sensible strings
// * []string: joined by `\n`s into a single string
// * anything else: delegate to FormatYaml
func FormatSmart(value interface{}) ([]byte, error) {
if value == nil {
return nil, nil
}
v := reflect.ValueOf(value)
switch kind := v.Kind(); kind {
case reflect.String:
return []byte(value.(string)), nil
case reflect.Array:
if v.Type().Elem().Kind() == reflect.String {
slice := reflect.MakeSlice(reflect.TypeOf([]string(nil)), v.Len(), v.Len())
reflect.Copy(slice, v)
return []byte(strings.Join(slice.Interface().([]string), "\n")), nil
}
case reflect.Slice:
if v.Type().Elem().Kind() == reflect.String {
return []byte(strings.Join(value.([]string), "\n")), nil
}
case reflect.Bool:
if value.(bool) {
return []byte("True"), nil
}
return []byte("False"), nil
case reflect.Map, reflect.Float32, reflect.Float64:
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
default:
return nil, fmt.Errorf("cannot marshal %#v", value)
}
return FormatYaml(value)
}
func (upckr *unpacker) unpackBlob(count int, isMapKey bool) (interface{}, error) {
theType := upckr.buffer[upckr.offset] & 0xff
upckr.offset++
count--
var val interface{}
switch theType {
case ParticleType.STRING:
val = string(upckr.buffer[upckr.offset : upckr.offset+count])
case ParticleType.BLOB:
if isMapKey {
b := reflect.Indirect(reflect.New(reflect.ArrayOf(count, reflect.TypeOf(byte(0)))))
reflect.Copy(b, reflect.ValueOf(upckr.buffer[upckr.offset:upckr.offset+count]))
val = b.Interface()
} else {
b := make([]byte, count)
copy(b, upckr.buffer[upckr.offset:upckr.offset+count])
val = b
}
case ParticleType.GEOJSON:
val = NewGeoJSONValue(string(upckr.buffer[upckr.offset : upckr.offset+count]))
default:
panic(NewAerospikeError(SERIALIZE_ERROR, fmt.Sprintf("Error while unpacking BLOB. Type-header with code `%d` not recognized.", theType)))
}
upckr.offset += count
return val, nil
}
func (self *structBuilder) Elem(i int) Builder {
if self == nil || i < 0 {
return nobuilder
}
switch v := self.val.(type) {
case *reflect.ArrayValue:
if i < v.Len() {
return &structBuilder{val: v.Elem(i)}
}
case *reflect.SliceValue:
if i > v.Cap() {
n := v.Cap()
if n < 8 {
n = 8
}
for n <= i {
n *= 2
}
nv := reflect.MakeSlice(v.Type().(*reflect.SliceType), v.Len(), n)
reflect.Copy(nv, v)
v.Set(nv)
}
if v.Len() <= i && i < v.Cap() {
v.SetLen(i + 1)
}
if i < v.Len() {
return &structBuilder{val: v.Elem(i)}
}
}
return nobuilder
}
func CopyExact(dest interface{}, src interface{}) {
dV := reflect.ValueOf(dest)
sV := reflect.ValueOf(src)
if dV.Kind() == reflect.Ptr {
dV = dV.Elem()
}
if dV.Kind() == reflect.Array && !dV.CanAddr() {
panic(fmt.Sprintf("dest not addressable: %T", dest))
}
if sV.Kind() == reflect.Ptr {
sV = sV.Elem()
}
if sV.Kind() == reflect.String {
sV = sV.Convert(reflect.SliceOf(dV.Type().Elem()))
}
if !sV.IsValid() {
panic("invalid source, probably nil")
}
if dV.Len() != sV.Len() {
panic(fmt.Sprintf("dest len (%d) != src len (%d)", dV.Len(), sV.Len()))
}
if dV.Len() != reflect.Copy(dV, sV) {
panic("dammit")
}
}
func (b *structBuilder) Elem(i int) builder {
if b == nil || i < 0 {
return nobuilder
}
switch v := b.val; v.Kind() {
case reflect.Array:
if i < v.Len() {
return &structBuilder{val: v.Index(i)}
}
case reflect.Slice:
if i >= v.Cap() {
n := v.Cap()
if n < 8 {
n = 8
}
for n <= i {
n *= 2
}
nv := reflect.MakeSlice(v.Type(), v.Len(), n)
reflect.Copy(nv, v)
v.Set(nv)
}
if v.Len() <= i && i < v.Cap() {
v.SetLen(i + 1)
}
if i < v.Len() {
return &structBuilder{val: v.Index(i)}
}
}
return nobuilder
}
func (p *printer) marshalSimple(typ reflect.Type, val reflect.Value) (string, []byte, error) {
switch val.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return strconv.FormatInt(val.Int(), 10), nil, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(val.Uint(), 10), nil, nil
case reflect.Float32, reflect.Float64:
return strconv.FormatFloat(val.Float(), 'g', -1, val.Type().Bits()), nil, nil
case reflect.String:
return val.String(), nil, nil
case reflect.Bool:
return strconv.FormatBool(val.Bool()), nil, nil
case reflect.Array:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// [...]byte
var bytes []byte
if val.CanAddr() {
bytes = val.Slice(0, val.Len()).Bytes()
} else {
bytes = make([]byte, val.Len())
reflect.Copy(reflect.ValueOf(bytes), val)
}
return "", bytes, nil
case reflect.Slice:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// []byte
return "", val.Bytes(), nil
}
return "", nil, &UnsupportedTypeError{typ}
}
func (builder *valueBuilder) Elem(i int) *valueBuilder {
if i < 0 {
panic(NewBsonError("negative index %v for array element", i))
}
switch builder.val.Kind() {
case reflect.Array:
if i < builder.val.Len() {
return ValueBuilder(builder.val.Index(i))
} else {
panic(NewBsonError("array index %v out of bounds", i))
}
case reflect.Slice:
if i >= builder.val.Cap() {
n := builder.val.Cap()
if n < 8 {
n = 8
}
for n <= i {
n *= 2
}
nv := reflect.MakeSlice(builder.val.Type(), builder.val.Len(), n)
reflect.Copy(nv, builder.val)
builder.val.Set(nv)
}
if builder.val.Len() <= i && i < builder.val.Cap() {
builder.val.SetLen(i + 1)
}
if i < builder.val.Len() {
return ValueBuilder(builder.val.Index(i))
} else {
panic(NewBsonError("internal error, realloc failed?"))
}
}
panic(NewBsonError("unexpected type %s, expecting slice or array", builder.val.Type()))
}
func (d *Decoder) decodeBinary(b []byte, v reflect.Value) error {
if v.Kind() == reflect.Interface {
buf := make([]byte, len(b))
copy(buf, b)
v.Set(reflect.ValueOf(buf))
return nil
}
switch v.Interface().(type) {
case []byte:
if v.IsNil() || v.Cap() < len(b) {
v.Set(reflect.MakeSlice(byteSliceType, len(b), len(b)))
} else if v.Len() != len(b) {
v.SetLen(len(b))
}
copy(v.Interface().([]byte), b)
default:
if v.Kind() == reflect.Array && v.Type().Elem().Kind() == reflect.Uint8 {
reflect.Copy(v, reflect.ValueOf(b))
break
}
return &UnmarshalTypeError{Value: "binary", Type: v.Type()}
}
return nil
}
func TestSort(t *testing.T) {
tests := []interface{}{
[]int{3, 4, 6, 7, 2},
[]uint{3, 4, 6, 7, 2},
[]float64{3, 4, 6, 7, 2},
[]string{"f", "d", "a", "c"},
[]int{1},
[]int{},
}
for _, v := range tests {
vv := reflect.ValueOf(v)
cpy := reflect.MakeSlice(vv.Type(), vv.Len(), vv.Len())
reflect.Copy(cpy, vv)
switch x := v.(type) {
case []int:
sort.Ints(x)
case []uint:
sort.Sort(uintslice(x))
case []float64:
sort.Float64s(x)
case []string:
sort.Strings(x)
}
reflectSortCompare(t, v, cpy)
}
}
func (f *decFnInfo) kSlice(rv reflect.Value) {
// A slice can be set from a map or array in stream.
currEncodedType := f.dd.currentEncodedType()
switch currEncodedType {
case valueTypeBytes, valueTypeString:
if f.ti.rtid == uint8SliceTypId || f.ti.rt.Elem().Kind() == reflect.Uint8 {
if bs2, changed2 := f.dd.decodeBytes(rv.Bytes()); changed2 {
rv.SetBytes(bs2)
}
return
}
}
if shortCircuitReflectToFastPath && rv.CanAddr() {
switch f.ti.rtid {
case intfSliceTypId:
f.d.decSliceIntf(rv.Addr().Interface().(*[]interface{}), currEncodedType, f.array)
return
case uint64SliceTypId:
f.d.decSliceUint64(rv.Addr().Interface().(*[]uint64), currEncodedType, f.array)
return
case int64SliceTypId:
f.d.decSliceInt64(rv.Addr().Interface().(*[]int64), currEncodedType, f.array)
return
case strSliceTypId:
f.d.decSliceStr(rv.Addr().Interface().(*[]string), currEncodedType, f.array)
return
}
}
containerLen, containerLenS := decContLens(f.dd, currEncodedType)
// an array can never return a nil slice. so no need to check f.array here.
if rv.IsNil() {
rv.Set(reflect.MakeSlice(f.ti.rt, containerLenS, containerLenS))
}
if containerLen == 0 {
return
}
if rvcap, rvlen := rv.Len(), rv.Cap(); containerLenS > rvcap {
if f.array { // !rv.CanSet()
decErr(msgDecCannotExpandArr, rvcap, containerLenS)
}
rvn := reflect.MakeSlice(f.ti.rt, containerLenS, containerLenS)
if rvlen > 0 {
reflect.Copy(rvn, rv)
}
rv.Set(rvn)
} else if containerLenS > rvlen {
rv.SetLen(containerLenS)
}
for j := 0; j < containerLenS; j++ {
f.d.decodeValue(rv.Index(j))
}
}
func main() {
var a A
a.A0 = append(a.A0, []int{1, 2, 3, 4, 5, 6, 7, 8, 9}...)
a.A1 = append(a.A1, 9, 8, 7, 6)
var n = reflect.Copy(reflect.ValueOf(a.A0), reflect.ValueOf(a.A1))
fmt.Println(n, a) // 4 {[9 8 7 6 5 6 7 8 9] [9 8 7 6]}
}