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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct A
  5. {
  6.     template<typename T> A(T&&) { cout << "T&&"       << endl; }
  7.     A(A&)                       { cout << "A&"        << endl; }
  8.     A(const A&)                 { cout << "const A&"  << endl; }
  9.     A(A&&)                      { cout << "A&&"       << endl; }
  10.     A(const A&&)                { cout << "const A&&" << endl; }
  11. };
  12.  
  13. struct B
  14. {
  15.     template<typename T> B(T&&) { cout << "T&&"       << endl; }
  16.     B(B&)                       { cout << "B&"        << endl; }
  17.     B(const B&)                 { cout << "const B&"  << endl; }
  18.     B(B&&)                      { cout << "B&&"       << endl; }
  19.     B(const B&&) = delete;
  20. };
  21.  
  22. int main() {
  23.     A pi(3.14159);            // T&&
  24.     const A answer(42);       // T&&
  25.     A a1(pi);                 // A&
  26.     A a2(answer);             // const A&
  27.     A a3(std::move(pi));      // A&&
  28.     A a4(std::move(answer));  // const A&&
  29.  
  30.     B hello("Hello");         // T&&
  31.     const B world("World");   // T&&
  32.     B b1(hello);              // B&
  33.     B b2(world);              // const B&
  34.     B b3(std::move(hello));   // B&&
  35. //  B b4(std::move(world));   // error: const B&& is deleted
  36.  
  37.     return 0;
  38. }
Success #stdin #stdout 0s 4392KB
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stdin
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Standard input is empty
stdout
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T&&
T&&
A&
const A&
A&&
const A&&
T&&
T&&
B&
const B&
B&&
https://ideone.com/vVPAJB
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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