模版小结2

// test2.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include <string>

#include <vector>

#include <iostream>

template<class T, T v>

struct integral_constant {

static const T value = v;

typedef T value_type;

typedef integral_constant<T, v> type;

};

template <class T, T v> const T integral_constant<T, v>::value;

typedef integral_constant<bool, true> true_type;

typedef integral_constant<bool, false> false_type;

template<class> struct is_array : public false_type {};

template<class T, size_t n> struct is_array<T
> : public true_type {};

template<class T> struct is_array<T[]> : public true_type {};

template<class T>

class CT;

template<class T>

class CT<T[]>

{

public:

CT(T* t):_t(t)

{

std::cout << "CT<T[]>" << std::endl;

}

T operator[](int n)

{

return _t
;

}

T* _t;

};

template<class T, int n>

class CT<T
>

{

public:

CT(T* t):_t(t)

{

std::cout << "CT<T
>" << std::endl;

}

T operator[](int n)

{

return _t
;

}

T* _t;

};

int _tmain(int argc, _TCHAR* argv[])

{

bool bArray = is_array<int[]>::value;

bArray = is_array<int[3]>::value;

int ar[10] = {1, 2, 4, 5, 6 , 6,6, 9};

CT<int[]> t(&ar[0]);

for(int i = 0; i < 10; i++)

{

std::cout << t[i] << " ";

}

std::cout << std::endl;

CT<int[12]> t2(&ar[0]);

for(int i = 0; i < 10; i++)

{

std::cout << t2[i] << " ";

}

return 0;

}