github.com/kaydxh/golang@v0.0.131/go/math/exp/exp.go (about)

     1  /*
     2   *Copyright (c) 2022, kaydxh
     3   *
     4   *Permission is hereby granted, free of charge, to any person obtaining a copy
     5   *of this software and associated documentation files (the "Software"), to deal
     6   *in the Software without restriction, including without limitation the rights
     7   *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   *copies of the Software, and to permit persons to whom the Software is
     9   *furnished to do so, subject to the following conditions:
    10   *
    11   *The above copyright notice and this permission notice shall be included in all
    12   *copies or substantial portions of the Software.
    13   *
    14   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   *SOFTWARE.
    21   */
    22  package exp
    23  
    24  import (
    25  	"math"
    26  
    27  	"golang.org/x/exp/constraints"
    28  )
    29  
    30  const PRECISION = 1e-6
    31  
    32  func Max[T constraints.Ordered](s ...T) T {
    33  	if len(s) == 0 {
    34  		var zero T
    35  		return zero
    36  	}
    37  	m := s[0]
    38  	for _, v := range s[1:] {
    39  		if m < v {
    40  			m = v
    41  		}
    42  	}
    43  	return m
    44  }
    45  
    46  func Min[T constraints.Ordered](s ...T) T {
    47  	if len(s) == 0 {
    48  		var zero T
    49  		return zero
    50  	}
    51  	m := s[0]
    52  	for _, v := range s[1:] {
    53  		if m > v {
    54  			m = v
    55  		}
    56  	}
    57  	return m
    58  }
    59  
    60  func Value[T constraints.Ordered](v, min, max T) T {
    61  	if v < min {
    62  		return min
    63  	}
    64  	if v > max {
    65  		return max
    66  	}
    67  
    68  	return v
    69  }
    70  
    71  func Equal[T float32 | float64](a, b T) bool {
    72  	return math.Abs(float64(a-b)) < PRECISION
    73  }
    74  
    75  func Sum[T constraints.Ordered](t ...T) T {
    76  	var sum T
    77  	for _, v := range t {
    78  		sum += v
    79  	}
    80  	return sum
    81  }