boost random的应用

 1 #pragma once
 2 #include <boost/random.hpp>
 3 #include <enable_singleton.h>
 4 #include <boost/thread.hpp>
 5 
 6 template<class T = boost::rand48>
 7 class enable_random
 8 {
 9 public:
10     enable_random(int seed)
11         :m_rand(seed)
12     {
13 
14     }
15 
16     int rand_100()
17     {
18         static boost::uniform_int<> ui(0,100);
19         return ui(m_rand);
20     }
21 
22     int rand_1w()
23     {
24         static boost::uniform_int<> ui(0,10000);
25         return ui(m_rand);
26     }
27 
28     int rand_int(int min, int max)
29     {
30         boost::uniform_int<> ui(min,max);
31         return ui(m_rand);
32     }
33 
34     double rand_01()
35     {
36         static boost::uniform_01<> ui;
37         return ui(m_rand);
38     }
39 
40     double rand_double(double min, double max)
41     {
42         boost::uniform_real<> ui(min, max);
43         return ui(m_rand);
44     }
45 
46 private:
47     T m_rand;
48 };
49 
50 //全局随机
51 class global_random
52     :public enable_singleton<global_random>
53 {
54 public:
55 
56     int rand_100()
57     {
58         return get_gen().rand_100();
59     }
60 
61     int rand_1w()
62     {        
63         return get_gen().rand_1w();
64     }
65 
66     int rand_int(int min, int max)
67     {
68         return get_gen().rand_int(min, max);
69     }
70 
71     double rand_01()
72     {
73         return get_gen().rand_01();
74     }
75 
76     double rand_double(double min, double max)
77     {
78         return get_gen().rand_double(min, max);
79     }
80 
81 private:
82     boost::thread_specific_ptr<enable_random<boost::mt19937>> m_rand;
83 
84     enable_random<boost::mt19937>& get_gen()
85     {
86         enable_random<boost::mt19937> *pRng = m_rand.get();
87         if (pRng) return *pRng;
88 
89         m_rand.reset(new enable_random<boost::mt19937>(std::time(nullptr)));
90         return *m_rand.get();
91     }
92 };