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  1.  
  2. #include <iostream>
  3. #include <cassert>
  4. #include <vector>
  5.  
  6. class MyClass
  7. {
  8. public:
  9.     explicit MyClass(
  10.         int theA, 
  11.         int theB
  12.     ) : myA(theA), 
  13.         myB(theB)
  14.     {
  15.         return;
  16.     };
  17.  
  18.     MyClass(
  19.         MyClass && theOther
  20.     ) : myA(std::move(theOther.myA)), 
  21.         myB(std::move(theOther.myB))
  22.     {
  23.         return;
  24.     }
  25.  
  26.     MyClass & operator=(
  27.         MyClass && theOther
  28.     ) {
  29.         assert(this != &theOther);
  30.  
  31.         myA = std::move(theOther.myA);
  32.         myB = std::move(theOther.myB);
  33.     }
  34.  
  35. private:
  36.     // Not default-constructible. 
  37.     explicit MyClass();
  38.  
  39.     // Enforce move-semantics. 
  40.     MyClass(const MyClass & theOther);
  41.     MyClass & operator=(const MyClass & theOther);
  42.  
  43. public:
  44.     int myA;
  45.     int myB;
  46. };
  47.  
  48. int main(int argc, char * argv[])
  49. {
  50.     std::vector<MyClass> v1;
  51.     std::vector<MyClass> v2;
  52.  
  53.     v1.push_back(MyClass(1, 2));
  54.     v1.push_back(MyClass(2, 3));
  55.     v1.push_back(MyClass(2, 4));
  56.  
  57.     // Works.
  58.     for(auto i = 0u; i < v1.size(); i++)
  59.         if(v1[i].myA == 2)
  60.             v2.push_back(std::move(v1[i]));
  61.  
  62.  
  63.     // Does not work: Calls copy-constructor.
  64.     for(auto i = v1.begin(); i != v1.end(); i++)
  65.         if(i->myA == 2)
  66.             v2.push_back(std::move(*i));
  67.  
  68.  
  69.     // list1 may not be used any longer!
  70.  
  71.     return 0;
  72. }
  73.  
Success #stdin #stdout 0s 3056KB
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https://ideone.com/afiMHs
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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