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41 lines
1.0 KiB
Go
41 lines
1.0 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package reflectutil contains reflect utilities.
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package reflectutil
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import "reflect"
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// hasPointers reports whether the given type contains any pointers,
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// including any internal pointers in slices, funcs, maps, channels,
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// etc.
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//
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// This function exists for Swapper's internal use, instead of reaching
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// into the runtime's *reflect._rtype kind&kindNoPointers flag.
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func hasPointers(t reflect.Type) bool {
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if t == nil {
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panic("nil Type")
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}
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k := t.Kind()
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if k <= reflect.Complex128 {
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return false
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}
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switch k {
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default:
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// chan, func, interface, map, ptr, slice, string, unsafepointer
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// And anything else. It's safer to err on the side of true.
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return true
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case reflect.Array:
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return hasPointers(t.Elem())
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case reflect.Struct:
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num := t.NumField()
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for i := 0; i < num; i++ {
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if hasPointers(t.Field(i).Type) {
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return true
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}
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}
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return false
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}
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}
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