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Explore how to use move semantics and copy semantics in C++. Understand transferring values with strings, the behavior of swap functions, and how move semantics impact performance in container types like BigArray. This lesson enhances your ability to write efficient C++ code by mastering value transfers and fallback mechanisms.

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Copying and moving strings #

C++
#include <iostream>
#include <string>
#include <utility>
int main(){
  std::string str1{"ABCDEF"};
  std::string str2;
  std::cout << "\n";
  // initial value
  std::cout << "str1 = " << str1 << std::endl;
  std::cout << "str2 = " << str2 << std::endl;
  // copy semantic
  str2= str1;
  std::cout << "str2 = str1;\n";
  std::cout << "str1 = " << str1 << std::endl;
  std::cout << "str2 = " << str2 << std::endl;
  std::cout << "\n";
  std::string str3;
  // initial value
  std::cout << "str1 = " << str1 << std::endl;
  std::cout << "str3 = " << str3 << std::endl;
  // move semantic
  str3= std::move(str1);
  std::cout << "str3 = std::move(str1);\n";
  std::cout << "str1 = " << str1 << std::endl;
  std::cout << "str3 = " << str3 << std::endl;
  std::cout << "\n";
}

Explanation

  • In the example above, we are demonstrating how the value of str1 can be transferred to strings using the copy semantic and the move semantic.

  • In line 17, we have used the copy semantic and the string "ABCDEF" is present in both str1 ...