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// 3.5.move.semantics.cpp

// modern c++ tutorial

// created by changkun at changkun.de

// https://github.com/changkun/modern-cpp-tutorial

#include <iostream> // std::cout

#include <utility> // std::move

#include <vector> // std::vector

#include <string> // std::string

int main() {

std::string str = "Hello world.";

std::vector<std::string> v;

// use push_back(const T&), copy

v.push_back(str);

// "str: Hello world."

std::cout << "str: " << str << std::endl;

// use push_back(const T&&), no copy

// the string will be moved to vector, and therefore std::move can reduce copy cost

v.push_back(std::move(str));

// str is empty now

std::cout << "str: " << str << std::endl;

return 0;

}