[C++知识库]STL源代码分析（1）组态1

1. __STL_STATIC_TEMPLATE_MEMBER_BUG

static member of template classes(模板类静态成员)

template <typename T>
class test{
public:
	static int _data;
}

int test<int>::_data=1;
int test<char>::_data=2;

2. __STL_CLASS_PARTIAL_SPECIALIZATION

模板类偏特化，是否支持 partial specialization of class templates

//一般化设计，非特化情况均使用这个
template <class I,class O>
struct test{
	test() { cout << "I, O" <<endl; }
};

//特殊化设计1（偏特化1）
template <class T>
struct test <T* ,T*> {
	test() { cout << "T* ,T*" << endl; }
};

//特殊化设计2（偏特化2）
template <class T>
struct test <const T* ,T*> {
	test() { cout << "const T* ,T*" << endl; }
};

//测试
int main() {
	test<int, char> obj1;         //I, O
	test<int*, int*> obj2;        //T*, T*
	test<const int*, int*> obj3;  //const T*, T*
}

3. __STL_FUNCTION_TMPL_PARTIAL_ORDER

是否支持partial ordering of function templates

template <class T,class Alloc=alloc>
class vec {
public:
	void swap(vec<T, Alloc>&) { cout << "swap1()" << endl; }
};

#ifdef __STL_FUNCTION_TMPL_PARTIAL_ORDER
template <class T, class Alloc = alloc>
inline void swap(vec<T, Alloc>& a, vec<T, Alloc>& b) { a.swap(b); }
#endif

int main() {
	vec<int> a, b;
	swap(a, b);
}