mirror of https://github.com/poanetwork/gecko.git
61 lines
897 B
Go
61 lines
897 B
Go
// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package math
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import (
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"errors"
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"math"
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)
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var (
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errOverflow = errors.New("overflow occurred")
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)
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// Max64 ...
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func Max64(a, b uint64) uint64 {
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if a < b {
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return b
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}
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return a
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}
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// Min64 ...
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func Min64(a, b uint64) uint64 {
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if a < b {
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return a
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}
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return b
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}
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// Add64 ...
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func Add64(a, b uint64) (uint64, error) {
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if a > math.MaxUint64-b {
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return 0, errOverflow
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}
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return a + b, nil
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}
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// Sub64 returns:
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// 1) a - b
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// 2) If there is underflow, an error
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func Sub64(a, b uint64) (uint64, error) {
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if a < b {
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return 0, errOverflow
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}
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return a - b, nil
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}
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// Mul64 ...
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func Mul64(a, b uint64) (uint64, error) {
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if b != 0 && a > math.MaxUint64/b {
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return 0, errOverflow
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}
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return a * b, nil
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}
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// Diff64 ...
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func Diff64(a, b uint64) uint64 {
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return Max64(a, b) - Min64(a, b)
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}
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