issue51925.go

     1  // compile
     2  
     3  // Copyright 2022 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import "fmt"
    10  
    11  type IntLike interface {
    12  	~int | ~int64 | ~int32 | ~int16 | ~int8
    13  }
    14  
    15  func Reduce[T any, U any, Uslice ~[]U](function func(T, U) T, sequence Uslice, initial T) T {
    16  	result := initial
    17  	for _, x := range sequence {
    18  		result = function(result, x)
    19  	}
    20  	return result
    21  }
    22  
    23  func min[T IntLike](x, y T) T {
    24  	if x < y {
    25  		return x
    26  	}
    27  	return y
    28  
    29  }
    30  
    31  // Min returns the minimum element of `nums`.
    32  func Min[T IntLike, NumSlice ~[]T](nums NumSlice) T {
    33  	if len(nums) == 0 {
    34  		return T(0)
    35  	}
    36  	return Reduce(min[T], nums, nums[0])
    37  }
    38  
    39  // VarMin is the variadic version of Min.
    40  func VarMin[T IntLike](nums ...T) T {
    41  	return Min(nums)
    42  }
    43  
    44  type myInt int
    45  
    46  func main() {
    47  	fmt.Println(VarMin(myInt(1), myInt(2)))
    48  
    49  	seq := []myInt{1, 2}
    50  	fmt.Println(Min(seq))
    51  	fmt.Println(VarMin(seq...))
    52  }
    53
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