github.com/searKing/golang/go@v1.2.117/exp/math/limits.go (about)

     1  // Copyright 2023 The searKing Author. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package math
     6  
     7  import (
     8  	"unsafe"
     9  
    10  	"golang.org/x/exp/constraints"
    11  )
    12  
    13  // MinInt returns the smallest value representable by the type.
    14  func MinInt[T constraints.Integer]() T {
    15  	var zero T
    16  	minusOne := ^zero
    17  	if minusOne > 0 {
    18  		return zero // Unsigned
    19  	}
    20  	bits := unsafe.Sizeof(zero) << 3
    21  	return minusOne << (bits - 1) // Signed
    22  }
    23  
    24  // MaxInt returns the largest value representable by the type.
    25  func MaxInt[T constraints.Integer]() T {
    26  	return ^MinInt[T]()
    27  }