【C++知识点】explicit 关键字

#include <iostream>
#include <string>
using namespace std;
class student {
public:
    //默认隐式构造
  student(int _age)
  {
    age = _age;
    cout << "age=" << age << endl;
  }
  student(int _age, const string _name)
  {
    age = _age;
    name = _name;
    cout << "age=" << age << "; name=" << name << endl;
  }
  ~student()
  {
  }
  int getAge()
  {
    return age;
  }
  string getName() {
    return name;
  }
private:
  int age;
  string name;
};
int main(void) {
  student xiaoM(18);   //显示构造
  student xiaoW = 18;  //隐式构造  
  student xiaoHua(19, "小花");   //显示构造
  student xiaoMei = { 18, "小美" };  //隐式构造
  system("pause");
  return 0;
}

explicit student(int _age)
{
    age = _age;
    cout << "age=" << age << endl;
}