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  1. #include <iostream>
  2. #include <boost/unordered_map.hpp>
  3.  
  4. using namespace std;
  5.  
  6. #define PEERS_KEY
  7.  
  8. class peer_key_c
  9. {
  10. public:
  11.         peer_key_c(int host, int uid)
  12.         {
  13.                 host_ = host;
  14. #ifdef PEERS_KEY
  15.                 uid_ = uid;
  16. #else
  17.                 (void)uid;
  18. #endif
  19.         }
  20.  
  21.         bool operator==(peer_key_c v) const
  22.         {
  23. #ifdef PEERS_KEY
  24.                 return host_ == v.host_ && uid_ == v.uid_;
  25. #else
  26.                 return host_ == v.host_;
  27. #endif
  28.         }
  29.  
  30.         bool operator<(peer_key_c v) const
  31.         {
  32. #ifdef PEERS_KEY
  33.                 return host_ < v.host_ || host_ == v.host_ && uid_ < v.uid_;
  34. #else
  35.                 return host_ < v.host_;
  36. #endif
  37.         }
  38.  
  39.         friend std::size_t hash_value(const peer_key_c& v)
  40.         {
  41.                 std::size_t seed = boost::hash_value(v.host_);
  42. #ifdef PEERS_KEY
  43.                 boost::hash_combine(seed, v.uid_);
  44. #endif
  45.                 return seed;
  46.         }
  47.  
  48.         int host_;
  49. #ifdef PEERS_KEY
  50.         int uid_;
  51. #endif
  52. };
  53.  
  54. struct t_peer
  55. {
  56.         long long downloaded;
  57.         long long uploaded;
  58.         time_t mtime = 0;
  59.         int uid;
  60.         short port;
  61.         bool left;
  62.         std::array<char, 20> peer_id;
  63. };
  64.  
  65. typedef boost::unordered_map<peer_key_c, t_peer> t_peers;
  66.  
  67. int main() {
  68. 	std::cout << "sizeof(t_peer) = " << sizeof(t_peer) << " bytes, total data size: " << sizeof(t_peer) * 10000 << " bytes" << std::endl;
  69. 	std::cout << "sizeof(peer_key_c) = " << sizeof(peer_key_c) << " bytes, total data size: " << sizeof(peer_key_c) * 10000 << " bytes" << std::endl;
  70.  
  71. 	return 0;
  72. }
Success #stdin #stdout 0s 3276KB
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Standard input is empty
stdout
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sizeof(t_peer) = 48 bytes, total data size: 480000 bytes
sizeof(peer_key_c) = 8 bytes, total data size: 80000 bytes
https://ideone.com/sY8LW7
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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