mirror of
https://github.com/duanhf2012/origin.git
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130 lines
2.9 KiB
Go
130 lines
2.9 KiB
Go
package math
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import (
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"github.com/duanhf2012/origin/v2/log"
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)
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type NumberType interface {
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int | int8 | int16 | int32 | int64 | float32 | float64 | uint | uint8 | uint16 | uint32 | uint64
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}
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type SignedNumberType interface {
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int | int8 | int16 | int32 | int64 | float32 | float64
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}
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type FloatType interface {
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float32 | float64
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}
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func Max[NumType NumberType](number1 NumType, number2 NumType) NumType {
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if number1 > number2 {
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return number1
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}
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return number2
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}
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func Min[NumType NumberType](number1 NumType, number2 NumType) NumType {
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if number1 < number2 {
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return number1
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}
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return number2
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}
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func Abs[NumType SignedNumberType](Num NumType) NumType {
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if Num < 0 {
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return -1 * Num
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}
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return Num
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}
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func AddSafe[NumType NumberType](number1 NumType, number2 NumType) (NumType, bool) {
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ret := number1 + number2
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if number2 > 0 && ret < number1 {
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log.Stack("Calculation overflow", log.Any("number1", number1), log.Any("number2", number2))
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return ret, false
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} else if number2 < 0 && ret > number1 {
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log.Stack("Calculation overflow", log.Any("number1", number1), log.Any("number2", number2))
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return ret, false
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}
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return ret, true
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}
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func SubSafe[NumType NumberType](number1 NumType, number2 NumType) (NumType, bool) {
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ret := number1 - number2
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if number2 > 0 && ret > number1 {
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log.Stack("Calculation overflow", log.Any("number1", number1), log.Any("number2", number2))
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return ret, false
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} else if number2 < 0 && ret < number1 {
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log.Stack("Calculation overflow", log.Any("number1", number1), log.Any("number2", number2))
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return ret, false
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}
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return ret, true
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}
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func MulSafe[NumType NumberType](number1 NumType, number2 NumType) (NumType, bool) {
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ret := number1 * number2
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if number1 == 0 || number2 == 0 {
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return ret, true
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}
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if ret/number2 == number1 {
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return ret, true
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}
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log.Stack("Calculation overflow", log.Any("number1", number1), log.Any("number2", number2))
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return ret, true
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}
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func Add[NumType NumberType](number1 NumType, number2 NumType) NumType {
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ret, _ := AddSafe(number1, number2)
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return ret
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}
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func Sub[NumType NumberType](number1 NumType, number2 NumType) NumType {
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ret, _ := SubSafe(number1, number2)
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return ret
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}
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func Mul[NumType NumberType](number1 NumType, number2 NumType) NumType {
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ret, _ := MulSafe(number1, number2)
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return ret
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}
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// 安全的求比例
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func PercentRateSafe[NumType NumberType, OutNumType NumberType](maxValue int64, rate NumType, numbers ...NumType) (OutNumType, bool) {
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// 比例不能为负数
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if rate < 0 {
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log.Stack("rate must not positive")
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return 0, false
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}
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if rate == 0 {
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// 比例为0
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return 0, true
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}
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ret := int64(rate)
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for _, number := range numbers {
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number64 := int64(number)
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result, success := MulSafe(number64, ret)
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if !success {
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// 基数*比例越界了，int64都越界了，没办法了
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return 0, false
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}
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ret = result
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}
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ret = ret / 10000
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if ret > maxValue {
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return 0, false
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}
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return OutNumType(ret), true
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}
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