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// Copyright (C) MongoDB, Inc. 2023-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
package ptrutil
// CompareInt64 is a piecewise function with the following return conditions:
//
// (1) 2, ptr1 != nil AND ptr2 == nil
// (2) 1, *ptr1 > *ptr2
// (3) 0, ptr1 == ptr2 or *ptr1 == *ptr2
// (4) -1, *ptr1 < *ptr2
// (5) -2, ptr1 == nil AND ptr2 != nil
func CompareInt64(ptr1, ptr2 *int64) int {
if ptr1 == ptr2 {
// This will catch the double nil or same-pointer cases.
return 0
}
if ptr1 == nil && ptr2 != nil {
return -2
}
if ptr1 != nil && ptr2 == nil {
return 2
}
if *ptr1 > *ptr2 {
return 1
}
if *ptr1 < *ptr2 {
return -1
}
return 0
}
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