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  1. #include <iostream>
  2.  
  3. class Int
  4. {
  5.     int n_;
  6.  
  7. public:
  8.     explicit Int(int n) noexcept : n_(n) { std::cout << "Int(" << n_ << ")\n"; }
  9.  
  10.     Int(Int const & rhs) : n_(rhs.n_) { std::cout << "Int(Int const &)[" << n_ << "]\n"; }
  11.     Int(Int && rhs)      : n_(rhs.n_) { std::cout << "Int(Int &&)     [" << n_ << "]\n"; }
  12.  
  13.     ~Int() { std::cout << "~Int()[" << n_ << "]\n"; }
  14.  
  15.     Int & operator+=(Int const & rhs) { n_ += rhs.n_; return *this; }
  16.     Int & operator+=(Int && rhs)      { n_ += rhs.n_; return *this; }
  17.  
  18. #ifdef LAZY
  19.     Int operator+(Int rhs) { return Int(*this) += std::move(rhs); }
  20. #else
  21.     Int operator+(Int const & rhs) { Int result(*this); result += rhs; return result; }
  22.     Int operator+(Int && rhs) { Int result(*this); result += std::move(rhs); return result; }
  23. #endif
  24. };
  25.  
  26.  
  27. int main()
  28. {
  29.     auto x = Int(10) + Int(20) + Int(30);
  30. }
  31.  
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
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Standard input is empty
stdout
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Int(30)
Int(20)
Int(10)
Int(Int const &)[10]
Int(Int const &)[30]
~Int()[30]
~Int()[10]
~Int()[20]
~Int()[30]
~Int()[60]
https://ideone.com/UKI1fx
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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