1 #include <boost/config.hpp>
2
3 #if defined(BOOST_MSVC)
4 #pragma warning(disable: 4786) // identifier truncated in debug info
5 #pragma warning(disable: 4710) // function not inlined
6 #pragma warning(disable: 4711) // function selected for automatic inline expansion
7 #pragma warning(disable: 4514) // unreferenced inline removed
8 #endif
9
10 //
11 // weak_ptr_timing_test.cpp
12 //
13 // Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
14 // Copyright 2005 Peter Dimov
15 //
16 // Distributed under the Boost Software License, Version 1.0. (See
17 // accompanying file LICENSE_1_0.txt or copy at
18 // http://www.boost.org/LICENSE_1_0.txt)
19 //
20
21 #include <boost/shared_ptr.hpp>
22 #include <boost/weak_ptr.hpp>
23
24 #include <vector>
25 #include <cstdio>
26 #include <ctime>
27 #include <cstdlib>
28
29 //
30
31 int const n = 29000;
32 int const k = 2048;
33
test(std::vector<boost::shared_ptr<int>> & v)34 void test( std::vector< boost::shared_ptr<int> > & v )
35 {
36 using namespace std; // printf, rand
37
38 std::vector< boost::weak_ptr<int> > w( v.begin(), v.end() );
39
40 int s = 0, r = 0;
41
42 for( int i = 0; i < n; ++i )
43 {
44 // randomly kill a pointer
45
46 v[ rand() % k ].reset();
47
48 for( int j = 0; j < k; ++j )
49 {
50 if( boost::shared_ptr<int> px = w[ j ].lock() )
51 {
52 ++s;
53 }
54 else
55 {
56 ++r;
57 w[ j ] = v[ rand() % k ];
58 }
59 }
60 }
61
62 printf( "\n%d locks, %d rebinds.", s, r );
63 }
64
main()65 int main()
66 {
67 using namespace std; // printf, clock_t, clock
68
69 std::vector< boost::shared_ptr<int> > v( k );
70
71 for( int i = 0; i < k; ++i )
72 {
73 v[ i ].reset( new int( 0 ) );
74 }
75
76 clock_t t = clock();
77
78 test( v );
79
80 t = clock() - t;
81
82 printf( "\n\n%.3f seconds.\n", static_cast<double>( t ) / CLOCKS_PER_SEC );
83
84 return 0;
85 }
86