using and name lookup

using 和 compiler的name lookup密切相关，在下面文章中对此进行了说明:

• cppreference Partial template specialization#Name lookup
• TODO: 添加the interface principle文章，其中也包含这个主题

Examples

cppreference Partial template specialization#Name lookup

#include<iostream>

namespace N
{
// primary template
template<class T1, class T2> class Z
{
public:
    Z()
    {
        std::cout << __PRETTY_FUNCTION__ << std::endl;
    }
};

}
using N::Z; // refers to the primary template
namespace N
{
// partial specialization    
template<class T> class Z<T, T*>
{
public:
    Z()
    {
        std::cout << __PRETTY_FUNCTION__ << std::endl;
    }
};

}
Z<int, int*> z; // name lookup finds N::Z (the primary template),
                // the partial specialization with T = int is then used
int main()
{

}
// g++ test.cpp

上述程序的输出如下:

N::Z<T, T*>::Z() [with T = int]