1config11.cpp

//file：1config11.cpp
//测试 class template 可否拥有 non-type template 参数
//test __STL_NON_TYPE_TMPL_PARAM_BUG in <stl_config.h>
//
//编译器：clang-800.0.42.1

#include <iostream>  
#include <cstddef>    //for size_t

using namespace std;

class alloc{
};

inline size_t __deque_buf_size(size_t n,size_t sz)
{
	return n != 0 ? n : (sz < 512 ? size_t(512 / sz) : size_t(1));
}

template <class T,class Ref,class Ptr,size_t BufSiz>
struct __deque_iterator{
	typedef __deque_iterator<T,T&,T*,BufSiz> iterator;
	typedef __deque_iterator<T,const T&,const T*,BufSiz> const_iterator;

	static size_t buffer_size() {return __deque_buf_size(BufSiz,sizeof(T));}
};

template <class T,class Alloc = alloc,size_t BufSiz = 0>
class deque{
public:
	typedef __deque_iterator<T,T&,T*,BufSiz> iterator;
};

int main()
{
	cout << deque<int>::iterator::buffer_size() << endl;			//128
	cout << deque<int,alloc,64>::iterator::buffer_size() << endl;	//64
}