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// c++1x tutorial
// created by changkun at shiyanlou.com
#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;
    // 将使用 push_back(const T&), 即产生拷贝行为
    v.push_back(str);
    // 将输出 "str: Hello world."
    std::cout << "str: " << str << std::endl;
    // 将使用 push_back(const T&&), 不会出现拷贝行为
    // 而整个字符串会被移动到 vector 中，所以有时候 std::move 会用来减少拷贝出现的开销
    // 这步操作后, str 中的值会变为空
    v.push_back(std::move(str));
    // 将输出 "str: "
    std::cout << "str: " << str << std::endl;
    return 0;

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