github.com/XiaoMi/Gaea@v1.2.5/util/hack/hack.go (about)

     1  // Copyright 2016 The kingshard Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  package hack
    16  
    17  import (
    18  	"reflect"
    19  	"strconv"
    20  	"strings"
    21  	"unsafe"
    22  )
    23  
    24  // String no copy to change slice to string
    25  // use your own risk
    26  func String(b []byte) (s string) {
    27  	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
    28  	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
    29  	pstring.Data = pbytes.Data
    30  	pstring.Len = pbytes.Len
    31  	return
    32  }
    33  
    34  // Slice no copy to change string to slice
    35  // use your own risk
    36  func Slice(s string) (b []byte) {
    37  	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
    38  	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
    39  	pbytes.Data = pstring.Data
    40  	pbytes.Len = pstring.Len
    41  	pbytes.Cap = pstring.Len
    42  	return
    43  }
    44  
    45  // IsSQLSep check if sql seperation
    46  func IsSQLSep(r rune) bool {
    47  	return r == ' ' || r == ',' ||
    48  		r == '\t' || r == '/' ||
    49  		r == '\n' || r == '\r'
    50  }
    51  
    52  // ArrayToString translate array to string
    53  func ArrayToString(array []int) string {
    54  	if len(array) == 0 {
    55  		return ""
    56  	}
    57  	var strArray []string
    58  	for _, v := range array {
    59  		strArray = append(strArray, strconv.FormatInt(int64(v), 10))
    60  	}
    61  
    62  	return strings.Join(strArray, ", ")
    63  }
    64  
    65  // Abs int64 abs
    66  func Abs(n int64) int64 {
    67  	y := n >> 63
    68  	return (n ^ y) - y
    69  }