| 1 | #include <iostream>
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| 2 | #include <map>
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| 3 | #include <vector>
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| 4 | #include <boost/shared_ptr.hpp>
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| 5 | #include <boost/functional/hash.hpp>
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| 6 |
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| 7 | int
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| 8 | main()
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| 9 | {
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| 10 | typedef boost::shared_ptr<int> ptr_type;
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| 11 | typedef std::map<std::size_t, int> hashes_type;
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| 12 | std::vector<ptr_type> v(25);
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| 13 | hashes_type hashes;
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| 14 | boost::hash<ptr_type> hasher;
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| 15 | ptr_type null_ptr;
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| 16 | ++hashes[hasher(null_ptr)];
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| 17 | for (int i(0); i < 25; ++i)
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| 18 | {
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| 19 | v[i] = ptr_type(new int(i));
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| 20 | std::size_t const hash(hasher(v[i]));
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| 21 | ++hashes[hash];
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| 22 | }
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| 23 | for (hashes_type::iterator it(hashes.begin()), end(hashes.end());
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| 24 | it != end; ++it)
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| 25 | {
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| 26 | std::cout << it->first << ": " << it->second << '\n';
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| 27 | }
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| 28 | }
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