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  1. #include <map>
  2. #include <tuple>
  3. #include <iostream>
  4.  
  5. class NixeCopy {
  6. public:
  7.     NixeCopy(NixeCopy const&) = delete;
  8.     NixeCopy(NixeCopy&&) = delete;
  9.     NixeCopy& operator =(NixeCopy const&) = delete;
  10.     NixeCopy& operator =(NixeCopy&&) = delete;
  11.  
  12.     NixeCopy(int a, int b) : a(a), b(b) {}
  13.  
  14.     int dings() const { return a + b; }
  15.  
  16. private:
  17.     int a;
  18.     int b;
  19. };
  20.  
  21. int main() {
  22.     std::map<int, NixeCopy> m;
  23.     m.emplace(
  24.         std::piecewise_construct,
  25.         std::make_tuple(42),
  26.         std::make_tuple(222, 444));
  27.  
  28.     auto it = m.find(42);
  29.     if (it != m.end()) {
  30.         std::cout << "found: " << it->second.dings() << "\n";
  31.     } else {
  32.         std::cout << "not found :(\n";
  33.     }
  34. }
  35.  
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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found: 666
https://ideone.com/nfCN4C
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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