c++隐式类型转换示例分享

/*=============================================================================
#     FileName: explicit_try.cc
#         Desc: 验证含有一个参数的非explicit构造函数是否可以拷贝初始化
=============================================================================*/
#include
#include
#include

using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::vector;

class People {
    public:
        People() = default;
        People(string s):name(s) { }
        string getName() const { return name; }
        static vector &getVector() { return name_arr; }
        //隐式类型转换，用string生成一个临时量，因此可以绑定到const形参上
        static void addToVector(const People &p) {
            name_arr.push_back(p.getName());
        }
    private:
        string name = “”;
        static vector name_arr;
};

vector People::name_arr = {};

int main(int argc, const char *argv[])
{
    People p;
    cout << "p :" << endl;
    cout << p.getName() << endl;
    People tom(“tom”);
    People::addToVector(tom);
    string Bo来源gaodai$ma#com搞$代*码*网b = “Bob”;
    People::addToVector(Bob);//隐式类型转换
    //People::addToVector(“Bob”);//只允许一步的隐式类型转换

    vector v = People::getVector();
    cout << "name_arr:" << endl;
    for (const auto &p : v) {
        cout << p << " ";
    }
    cout << endl;

    string myName = “guo”;
    People guo = myName; //隐式类型转换允许拷贝初始化形式的转换
    cout << guo.getName() << endl;
    return 0;
}