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re: ��M��W�记�Q�Effective C++ 炒冷�?- Item47 traits�Q�类型信息榨取机

陈昱(CY) — Wed, 12 May 2010 12:28:00 GMT

不过感觉仍然有不��I��两个食物里面都要定义一个typedef

陈昱(CY) 2010-05-12 20:28 发表评论

re: ��M��W�记�Q�Effective C++ 炒冷�?- Item47 traits�Q�类型信息榨取机

陈昱(CY) — Wed, 12 May 2010 12:20:00 GMT

�q�是模板特化比函数容易想到~~

#include
#include
using namespace std;

struct Gooood{};
struct Baaaad{};

template
class TasteFood
{
public:
static void Test()
{
cout<<"er...I don't know this smell,taste fail........"< }
};

template<>
class TasteFood
{
public:
static void Test()
{
cout<<"this food tasted goooooooooood~~~~~"< }
};

template<>
class TasteFood
{
public:
static void Test()
{
cout<<"this food tasted baaaaaaad........."< }
};

class Pizzzzzza
{
public:
typedef Gooood T_Tasted;
};
class FoodInSchool
{
public:
typedef Baaaad T_Tasted;
};

template
void AfterEat(T&food)
{
TasteFood::Test();
}

int main()
{
Pizzzzzza food1;
FoodInSchool food2;

AfterEat(food1);
AfterEat(food2);

int a;
cin>>a;
return 0;
}

陈昱(CY) 2010-05-12 20:20 发表评论

re: ��M��W�记�Q�Effective C++ 炒冷�?- Item47 traits�Q�类型信息榨取机

陈梓�?vczh) — Wed, 12 May 2010 11:34:00 GMT

@Justin.H
因�ؓ你仅仅是需要得到那个类型，而不是得到那个类型的行�ؓ�Q�所以不需要创建wasani的实例。因此Try也就不能要求用户传入一个实例了。因此直接传入类型�?img src ="http://www.shnenglu.com/note-of-justin/aggbug/115215.html" width = "1" height = "1" />

陈梓�?vczh) 2010-05-12 19:34 发表评论