1 | #include <boost/shared_ptr.hpp>
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2 | #include <boost/weak_ptr.hpp>
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3 | #include <functional>
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4 | #include <iostream>
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5 | #include <numeric>
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6 | #include <vector>
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7 | #include <time.h>
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8 |
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9 | namespace
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10 | {
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11 |
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12 | const long long NS_IN_SEC = 1000000000;
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13 |
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14 | long long getTimeNS()
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15 | {
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16 | timespec ts;
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17 | clock_gettime(CLOCK_REALTIME, &ts);
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18 | return ((ts.tv_sec * NS_IN_SEC) + ts.tv_nsec);
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19 | }
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20 |
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21 | long long numCallsToTestDestructor = 0;
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22 |
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23 | struct Test
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24 | {
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25 | Test()
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26 | {
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27 | }
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28 |
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29 | ~Test()
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30 | {
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31 | ++numCallsToTestDestructor;
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32 | }
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33 |
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34 | };
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35 |
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36 | }
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37 |
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38 | int main(int argc, char** argv)
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39 | {
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40 | const int iterations = 10000;
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41 | std::vector<long long> deltaNSVector;
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42 | deltaNSVector.reserve(iterations);
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43 |
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44 | for (int i = 0; i < iterations; ++i)
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45 | {
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46 | const long long startTimeNS = getTimeNS();
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47 | boost::shared_ptr<Test> p(new Test);
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48 | for (int j = 0; j < 10; ++j)
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49 | {
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50 | boost::shared_ptr<Test> p2(p);
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51 | boost::weak_ptr<Test> pw(p);
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52 | boost::shared_ptr<Test> p3(pw);
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53 | }
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54 | const long long endTimeNS = getTimeNS();
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55 | deltaNSVector.push_back(endTimeNS - startTimeNS);
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56 | }
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57 |
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58 | const long long sum = std::accumulate(deltaNSVector.begin(), deltaNSVector.end(), 0);
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59 | const double average = ((double)sum) / iterations;
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60 | std::cout << "average time ns = " << average << std::endl;
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61 | std::cout << "numCallsToTestDestructor = " << numCallsToTestDestructor << std::endl;
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62 |
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63 | return 0;
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64 | }
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