SFINAE应用三

gongzhxu

于 2012-05-16 16:30:43 发布

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分类专栏：读书整理文章标签： class include struct

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#include <iostream>
using namespace std;

template<typename T>
class IsClass
{
private:
	typedef char One;
	typedef struct{char x[2];} Two;

	template <typename U>  
	static One is_class(int U::*);

	template <typename U>  
	static Two is_class(...);

public:
	enum {Yes = sizeof(is_class<T>(0)) == 1};
	enum {No = !Yes};
};

class Test{};

void main()
{
	if(IsClass<Test>::Yes)
	{
		cout<< "is the class" <<endl;
	}
	else
	{
		cout<< "not the class" <<endl;
	}
	cin.get();
}