Added a weak_ptr timing test.

[SVN r28483]

test/weak_ptr_timing_test.cpp

@@ -0,0 +1,85 @@
+#include <boost/config.hpp>
+
+#if defined(BOOST_MSVC)
+#pragma warning(disable: 4786)  // identifier truncated in debug info
+#pragma warning(disable: 4710)  // function not inlined
+#pragma warning(disable: 4711)  // function selected for automatic inline expansion
+#pragma warning(disable: 4514)  // unreferenced inline removed
+#endif
+
+//
+//  weak_ptr_timing_test.cpp
+//
+//  Copyright (c) 2002 Peter Dimov and Multi Media Ltd.
+//  Copyright 2005 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+
+#include <vector>
+#include <cstdio>
+#include <ctime>
+#include <cstdlib>
+
+//
+
+int const n = 29000;
+int const k = 2048;
+
+void test( std::vector< boost::shared_ptr<int> > & v )
+{
+    using namespace std; // printf, rand
+
+    std::vector< boost::weak_ptr<int> > w( v.begin(), v.end() );
+
+    int s = 0, r = 0;
+
+    for( int i = 0; i < n; ++i )
+    {
+        // randomly kill a pointer
+
+        v[ rand() % k ].reset();
+
+        for( int j = 0; j < k; ++j )
+        {
+            if( boost::shared_ptr<int> px = w[ j ].lock() )
+            {
+                ++s;
+            }
+            else
+            {
+                ++r;
+                w[ j ] = v[ rand() % k ];
+            }
+        }
+    }
+
+    printf( "\n%d locks, %d rebinds.", s, r );
+}
+
+int main()
+{
+    using namespace std; // printf, clock_t, clock
+
+    std::vector< boost::shared_ptr<int> > v( k );
+
+    for( int i = 0; i < k; ++i )
+    {
+        v[ i ].reset( new int( 0 ) );
+    }
+
+    clock_t t = clock();
+
+    test( v );
+
+    t = clock() - t;
+
+    printf( "\n\n%.3f seconds.\n", static_cast<double>( t ) / CLOCKS_PER_SEC );
+
+    return 0;
+}