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type DeepCopyGen[T any] interface {
	DeepCopyInto(*T)
}

func DeepCopy[T any](in, out *T) {
	var _in any = in
	if d, ok := _in.(DeepCopyGen[T]); ok {
		// use deepcopy-gen
		d.DeepCopyInto(out)
		return
	}
	// Have to call pcopy.Preheat each time
	pcopy.Copy(in, out, pcopy.WithUsePreheat())
}

deepcopy.Copy(dst, src).Do()

deepcopy.Copy().MaxDepth(1).Do()

deepcopy.Copy().RegisterTagName("copy").Do()

deepcopy.Copy().OnlyType(reflect.String, reflect.Int).Do()

deepcopy.Copy().OnlyField("id", "idx").Do()
deepcopy.Copy().OnlyField(".struct2", ".struct3").Do()

deepcopy.Copy().NeeValid(deepcopy.String()).Do()

import (
	"testing"

	"github.com/antlabs/deepcopy"
)

func TestPointerCopy(t *testing.T) {
	type A struct {
		p []int
	}

	src := A{[]int{1}}
	t.Logf("%v", src)
	var dst A
	deepcopy.Copy(&dst, &src).Do()
	t.Logf("%v", dst)
	dst.p[0] = 2 // panic here
	if src.p[0] == dst.p[0] {
		t.Fail()
	}
}

=== RUN   TestPointerCopy
--- FAIL: TestPointerCopy (0.00s)
    deepcopy_test.go:15: {[1]}
    deepcopy_test.go:18: {[]}
panic: runtime error: index out of range [0] with length 0 [recovered]
        panic: runtime error: index out of range [0] with length 0

goroutine 7 [running]:
testing.tRunner.func1(0xc0000b2200)
        /usr/lib/go-1.13/src/testing/testing.go:874 +0x3a3
panic(0x5cfc00, 0xc0000162a0)
        /usr/lib/go-1.13/src/runtime/panic.go:679 +0x1b2
golang_test.TestPointerCopy(0xc0000b2200)
        /home/phenix/github/phenix3443/test/golang/deepcopy_test.go:19 +0x2a6
testing.tRunner(0xc0000b2200, 0x5f3bd0)
        /usr/lib/go-1.13/src/testing/testing.go:909 +0xc9
created by testing.(*T).Run
        /usr/lib/go-1.13/src/testing/testing.go:960 +0x350
FAIL    golang_test     0.010s
FAIL