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  1. #include <cstring>
  2. #include <iostream>
  3. #include <memory>
  4.  
  5. class String {
  6.  public:
  7.   String(const char* s) : data_(strdup(s)) {}
  8.   ~String() { free(const_cast<char*>(data_)); }
  9.   // Строки в Java immutable, имитирующие им C++ строки - тоже.
  10.   String operator=(String&&) = delete;
  11.   String operator=(const String&) = delete;
  12.  
  13.   friend std::ostream& operator<<(std::ostream& o,
  14.                                   const String& s) {
  15.     o << s.data_;
  16.     return o;
  17.   }
  18.  private:
  19.   const char* data_;
  20. };
  21.  
  22.  
  23. int main() {
  24.   auto foo = std::make_shared<String>("foo");
  25.   auto bar = std::make_shared<String>("bar");
  26.   std::swap(foo, bar);
  27.   // foo приняло значение "bar", а bar" приняло значение "foo".
  28.   std::cout << "foo: " << (*foo) << "\n";
  29.   std::cout << "bar: " << (*bar) << "\n";
  30.  
  31.   std::cin.get();
  32. }
Success #stdin #stdout 0s 4412KB
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Standard input is empty
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foo: bar
bar: foo
https://ideone.com/UZ75sr
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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