C++11中强类型枚举的使用

//方法一:
enum {Male,Female};

//方法二:
#define Male 0
#define Female 1

//方法三:
static const int Male=0;
static const int Female=1;

enum Gender{Male,Female};
Gender a=Male;
a=Female;
a=1;//错误

    enum Gender{Male,Female};
    Gender a=Male;
    int b=a;
    int c=Female;

enum Gender{Male=-1000,Female=9999};//这段代码可能在某些编译器中报错

#include<iostream>
using namespace std;
enum class Type {General,Light,Medium,Heavy};
enum struct Category{General=1,Pistol,MachineGun,Cannon};

int main()
{
    Type t=Type::Light;
    t=General;//编译错误
    if(t==Category::General)//编译错误
        cout<<"A"<<endl;
    if(t> Type::General)//编译通过
        cout<<"B"<<endl;
    if(t>0)//编译错误
        cout<<"C"<<endl;
    cout<<is_pod<Type>::value<<endl;//1
    cout<<is_pod<Category>::value<<endl;

}

#include<iostream>
using namespace std;
enum class C: char{C1=1,C2=2};
enum class D: unsigned int {D1=1,D2=2,Dbig=0xfffffff0u};
int main()
{
    cout<<sizeof(C::C1)<<endl;
    cout<<(unsigned int)D::Dbig<<endl;
    cout<<sizeof(D::D1)<<endl;
    cout<<sizeof(D::Dbig)<<endl;
}