關鍵字mutable測試

看到關鍵字mutable，無聊就寫了一個測試代碼。

直接貼代碼吧。不解釋。

#include <iostream>using std::cout;using std::endl;class test{public:test();~test();void output() const;private: mutable int m_lhs;int m_rhs;};test::test(){m_lhs = 0;m_rhs = 1;}test::~test(){}//如果m_lhs 不申請為mutable，則編譯錯誤。void test::output() const {cout << "helloworld" << endl;m_lhs = m_rhs;}void testMutable(const test& temp){temp.output();}int main(int argc, char* argv[]){test mTest;testMutable(mTest);return 0;}