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remove float32 variant, relocate into separate file
This change removes the float32 variant of the AlmostEqual funcs, that we will likely never use. This change also relocates the function into a separate file to avoid modifying a file that's a fork of another vendored package.
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// Copyright (c) 2015 Björn Rabenstein | ||
// | ||
// Permission is hereby granted, free of charge, to any person obtaining a copy | ||
// of this software and associated documentation files (the "Software"), to deal | ||
// in the Software without restriction, including without limitation the rights | ||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
// copies of the Software, and to permit persons to whom the Software is | ||
// furnished to do so, subject to the following conditions: | ||
// | ||
// The above copyright notice and this permission notice shall be included in all | ||
// copies or substantial portions of the Software. | ||
// | ||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
// SOFTWARE. | ||
// | ||
// The code in this package is copy/paste to avoid a dependency. Hence this file | ||
// carries the copyright of the original repo. | ||
// https://github.com/beorn7/floats | ||
package internal | ||
|
||
import ( | ||
"math" | ||
) | ||
|
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// minNormalFloat64 is the smallest positive normal value of type float64. | ||
var minNormalFloat64 = math.Float64frombits(0x0010000000000000) | ||
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// AlmostEqualFloat64 returns true if a and b are equal within a relative error | ||
// of epsilon. See http://floating-point-gui.de/errors/comparison/ for the | ||
// details of the applied method. | ||
func AlmostEqualFloat64(a, b, epsilon float64) bool { | ||
if a == b { | ||
return true | ||
} | ||
absA := math.Abs(a) | ||
absB := math.Abs(b) | ||
diff := math.Abs(a - b) | ||
if a == 0 || b == 0 || absA+absB < minNormalFloat64 { | ||
return diff < epsilon*minNormalFloat64 | ||
} | ||
return diff/math.Min(absA+absB, math.MaxFloat64) < epsilon | ||
} | ||
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// AlmostEqualFloat64s is the slice form of AlmostEqualFloat64. | ||
func AlmostEqualFloat64s(a, b []float64, epsilon float64) bool { | ||
if len(a) != len(b) { | ||
return false | ||
} | ||
for i := range a { | ||
if !AlmostEqualFloat64(a[i], b[i], epsilon) { | ||
return false | ||
} | ||
} | ||
return true | ||
} |
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