// maximum of two values of any type
template <typename T>
inline T const& max (T const& a, T const& b)
{
    return a<b?b:a;
}

// maximum of three values of any type
template <typename T>
inline T const& max (T const& a, T const& b, T const& c)
{
    return max (max(a,b), c); 
}                              

一个是：inline int const& max申明在template <typename T>
inline T const& max之后。

// maximum of two values of any type
template <typename T>
inline T const& max (T const& a, T const& b)
{
    return a<b?b:a;
}

// maximum of three values of any type
template <typename T>
inline T const& max (T const& a, T const& b, T const& c)
{
    return max (max(a,b), c); 
}

// maximum of two int values
inline int const& max (int const& a, int const& b)
{
    return a<b?b:a;
}

调用程序：
int main( )
{
      //当然这里本来就写得不好，要先显式申明写局部变量......
      // 看你了解多少，讨论讨论两种执行可能的执行路径，即：FunctionTemplate的调用路径！！！
      ::max( 4, 10 ,15 );

} 

// maximum of two values of any type
template <typename T>
inline T const& max (T const& a, T const& b)
{
    return a<b?b:a;
}

// maximum of three values of any type
template <typename T>
inline T const& max (T const& a, T const& b, T const& c)
{
    return max (max(a,b), c);
}

inline int const& max (int const& a, int const& b) 已经是template <typename T>
inline T const& max (T const& a, T const& b) 对类型int的实例化，所以，凡是需要调用max<int>时，VC 编译器都不在再用max<int>来Instantiate max Function Template.


int main ()
{ 
    ::max(7, 42, 68); // calls the template for three arguments first, then call inline int const& max   
       

    ::max(7.0, 42.0); // calls max<double> (by argument deduction)
    ::max('a', 'b'); // calls max<char> (by argument deduction)
    ::max(7, 42);  // calls the nontemplate for two ints 
 
    ::max<>(7, 42);  // call inline int const& max
    ::max<int>(7, 42); // call inline int const& max
    ::max<int>(7.0, 42.0); // call inline int const& max
    ::max<double>(7, 42); // calls max<double> (no argument deduction)

   return 0;
}