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38 lines
1.5 KiB
Go
38 lines
1.5 KiB
Go
// Copyright ©2014 The Gonum 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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//go:build !safe
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// +build !safe
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package set
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import "unsafe"
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// same determines whether two sets are backed by the same store. In the
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// current implementation using hash maps it makes use of the fact that
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// hash maps are passed as a pointer to a runtime Hmap struct. A map is
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// not seen by the runtime as a pointer though, so we use unsafe to get
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// the maps' pointer values to compare.
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func same(a, b Nodes) bool {
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return *(*uintptr)(unsafe.Pointer(&a)) == *(*uintptr)(unsafe.Pointer(&b))
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}
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// intsSame determines whether two sets are backed by the same store. In the
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// current implementation using hash maps it makes use of the fact that
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// hash maps are passed as a pointer to a runtime Hmap struct. A map is
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// not seen by the runtime as a pointer though, so we use unsafe to get
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// the maps' pointer values to compare.
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func intsSame(a, b Ints) bool {
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return *(*uintptr)(unsafe.Pointer(&a)) == *(*uintptr)(unsafe.Pointer(&b))
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}
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// int64sSame determines whether two sets are backed by the same store. In the
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// current implementation using hash maps it makes use of the fact that
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// hash maps are passed as a pointer to a runtime Hmap struct. A map is
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// not seen by the runtime as a pointer though, so we use unsafe to get
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// the maps' pointer values to compare.
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func int64sSame(a, b Int64s) bool {
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return *(*uintptr)(unsafe.Pointer(&a)) == *(*uintptr)(unsafe.Pointer(&b))
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}
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