A problem about function template specialization

First , Remember that function template specialization must require an original template , To specialize function templates , Otherwise, an error will be reported “ It is not a display specialization of function templates ”

（ Be careful ： The original template and the specialized template should be in the same form , You can't add anything else ）

such as ：

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       #include<iostream>
       
       
#include<cstring>
       
       
typedef const char*pd;
       
       
template<typename T> // The original template 
       
       
T max(T a,T b)
       
       
{
       
       
return (a>b?a:b);
       
       
}
       
       
template<> // Function template specialization 
       
       
pd max<pd>(pd a,pd b)
       
       
{
       
       
return (strcmp(a,b)>0?a:b);
       
       
}
       
       
int main()
       
       
{
       
       
cout<<"max(7,8)="<<max(7,8)<<endl;
       
       
s1="hello";
       
       
s2="welcome";
       
       
cout<<"max(s1,s2)"<<max(s1,s2)<<endl;
       
       
return 0;
       
       
}
      
      
      
      

       
       
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After changing to this, there is no function template display , But there are functions max heavy load , Then I thought about ,C++ in max Function is a function of the system , hold max Change to Max Just fine .