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聊聊gost的DeltaCompare

2021-02-25 09:51:56 作者：互联网

序
本文主要研究一下gost的DeltaCompare

DeltaCompare
gost/math/compare.go

// equivalent to math.Abs(expected - actual) <= delta
func DeltaCompareFloat64(expected float64, actual float64, delta float64) bool {
if expected > actual {
return expected-actual <= delta
}
return actual-expected <= delta
}

func DeltaCompareFloat32(expected float32, actual float32, delta float32) bool {
if expected > actual {
return expected-actual <= delta
}
return actual-expected <= delta
}
DeltaCompareFloat64及DeltaCompareFloat32对比两个float类型的差值是否小于等于指定的delta
实例
gost/math/compare_test.go

func TestFloat64(t *testing.T) {
assert.True(t, DeltaCompareFloat64(12.3334, 12.3344, 0.01))
assert.True(t, DeltaCompareFloat64(12.3334, 12.32981, 0.01))
assert.False(t, DeltaCompareFloat64(12.3334, 12.0325, 0.01))
}

func TestCompareFloat32(t *testing.T) {
assert.True(t, DeltaCompareFloat32(12.3334, 12.3344, 0.01))
assert.True(t, DeltaCompareFloat32(12.3334, 12.32981, 0.01))
assert.False(t, DeltaCompareFloat64(12.3334, 12.0325, 0.01))
}
小结
gost的提供了DeltaCompareFloat32、DeltaCompareFloat64方法用于对比两个float类型的差值是否小于等于指定的delta。

doc
gost

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来源： https://blog.51cto.com/15113698/2636618