C++0x 右值引用

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本文展示了一个使用C++实现的智能对象交换示例，通过自定义类`A`及其实现的拷贝构造、移动构造、赋值操作符等，演示了资源管理及对象交换的过程。特别对比了两种不同的对象交换方式：一种利用移动语义优化；另一种则为传统方式。

#include <iostream> #include <algorithm> #include <boost/array.hpp> #include <algorithm> #include <string> #include <vector> using namespace std; struct A { enum { SIZE = 3 }; A() { cout << "Constructor." << endl; p = new int[SIZE]; } A(const A &other) { cout << "Copy Constructor." << endl; p = new int[SIZE]; for (int i = 0; i < SIZE; ++i) p[i] = other.p[i]; } A(A &&other) { cout << "Move Constructor." << endl; p = other.p; other.p = 0; } A& operator=(const A &other) { cout << "Operator=." << endl; for (int i = 0; i < SIZE; ++i) p[i] = other.p[i]; return *this; } A& operator=(A &&other) { cout << "&& Operator=." << endl; p = other.p; other.p = 0; return *this; } ~A() { cout << "Destructor." << endl; delete[] p; } int *p; }; template <class T> void MySwap(T &a, T &b) { T tmp(move(a)); a = move(b); b = move(tmp); } template <class T> void MySwap2(T &a, T &b) { T tmp = a; a = b; b = tmp; } int main() { A s1, s2; for (int i = 0; i < A::SIZE; ++i) s1.p[i] = i, s2.p[i] = 100 + i; cout << endl; MySwap(s1, s2); cout << endl; //MySwap2(s1, s2); cout << endl; for (int i = 0; i < A::SIZE; ++i) cout << s1.p[i] << ' '; cout << endl; for (int i = 0; i < A::SIZE; ++i) cout << s2.p[i] << ' '; cout << endl; system("pause"); return 0; }