关于golang:聊聊gost的DeltaCompare

序

本文次要钻研一下 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 比照两个 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 办法用于比照两个 float 类型的差值是否小于等于指定的 delta。

doc

• gost