mirror of
https://github.com/tursom/GoCollections.git
synced 2025-03-15 02:10:06 +08:00
48 lines
872 B
Go
48 lines
872 B
Go
/*
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* Copyright (c) 2022 tursom. All rights reserved.
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* Use of this source code is governed by a GPL-3
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* license that can be found in the LICENSE file.
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*/
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package lang
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import (
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"unsafe"
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)
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//goland:noinspection GoVetUnsafePointer
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func HashAddr[V any](v *V) int32 {
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p := uintptr(unsafe.Pointer(v))
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remain := int32(unsafe.Sizeof(*v))
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hash := int32(0)
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for remain-4 >= 0 {
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remain -= 4
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hash = hash*31 ^ *(*int32)(unsafe.Pointer(p))
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p += 4
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}
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for remain > 0 {
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hash = hash*31 ^ int32(*(*int8)(unsafe.Pointer(p)))
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p++
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remain--
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}
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return hash
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}
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func Hash32[T any](p *T) int32 {
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return *(*int32)(unsafe.Pointer(p))
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}
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func Hash64[T any](p *T) int32 {
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i := *(*int64)(unsafe.Pointer(p))
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return int32(i) ^ int32(i>>32)
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}
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func HashString(str string) int32 {
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hashCode := int32(0)
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for _, r := range str {
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hashCode = 31*hashCode + r
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}
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return hashCode
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}
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