MongoDB  2.7.0
hash.h
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1 
3 /* Copyright 2009 10gen Inc.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #pragma once
19 
20 namespace mongoutils {
21 
27  inline unsigned hashPointer(void *v) {
28  unsigned x = 0;
29  unsigned char *p = (unsigned char *) &v;
30  for( unsigned i = 0; i < sizeof(void*); i++ ) {
31  x = x * 131 + p[i];
32  }
33  return x;
34  }
35 
36  inline unsigned hash(unsigned u) {
37  unsigned char *p = (unsigned char *) &u;
38  return (((((p[3] * 131) + p[2]) * 131) + p[1]) * 131) + p[0];
39  }
40 
41 }
unsigned hashPointer(void *v)
Definition: hash.h:27