1、explicit

关键字，用于修饰构造函数，防止构造函数隐式转换，用于增强代码明确性，提高代码可读性。
缺点：由于explicit关键字阻止了构造函数隐式转换，所以需要额外代码进行类型转换。

class MyClass
{
public:MyClass(std::string name) { name_ = name;}
private:std::string name_;
};class MyClass1
{
public:explicit MyClass1(std::string name) { name_ = name;}
private:std::string name_;
};void Fun(MyClass c)
{//...
}void Fun1(MyClass c)
{//...
}int main(int argc, char *argv[])
{std::string name = "ZhangSan";Fun(name); //正确Fun1(name); //编译错误Fun1(MyClass1(name)); //正确MyClass1 obj0("ZhangSan"); //直接初始化，正确MyClass1 obj1{"ZhangSan"}; //列表初始化，正确MyClass1 obj2 = "ZhangSan"; //复制初始化，编译错误MyClass  obj3 = "ZhangSan"; //正确return 0;
}