NameTempSpecial, C++ (gcc)

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//g++  7.4.0
//NameTempSpecial: example of Namespace and template specialization
//this code is created by Rezaul Hoque on May 12,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
#include <iostream>
#include <string>

namespace intro{
template<class X>
class Deco{
public:
void f1(){std::cout<<"---------";}
void f2(){std::cout<<"This is a demo";}
};

template<>
class Deco<std::string>;//forward declare specialization for string
}
template <>
class intro::Deco<std::string>{
public:
void f1(){
std::cout<<"<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"<<"\n";
 std::cout<<">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"<<"\n";
}
void f2(){std::cout<<"Namespace & Template Specialization Example \n";}
};
namespace NamAd{
template <class X>
class Name {
X n;
public:
Name(){}
Name(X);
Name(Name&);
~Name(){}
X getName();
template <class V>//member template
class Ad{
V ad;
public:
Ad(){}
Ad(V);
~Ad(){}
V getAd(){ return ad;}
};
};
template<>//for the specialized Name 
template <>//for the specialized Ad
std::string Name<std::string>::Ad<std::string>::getAd(){std::cout<<"Address of a specialized template.\n";
return ad;}
//definition of Name(X) constructor declared earlier
template<class X>
Name<X>::Name(X a){n=a;}

//definition of Name (Name&) copy constructor declared earlier
template<class X>
Name<X>::Name(Name& c){n=c.n;}
//definition of getName() function declared earlier
template<class X>
X Name<X>::getName(){ return n;}

//definition of Ad(V) constructor declared earlier
template <class X>
template <class V>
Name<X>::Ad<V>::Ad(V a){ad=a;}
}

int main()
{
    intro::Deco<std::string> a;
    a.f1();
     a.f2();
     a.f1();
    NamAd::Name<std::string> naam("AAA");
    NamAd::Name<std::string>::Ad<std::string> bari("Nowhere ");
std::cout<<naam.getName()<<" \n";
std::cout<<bari.getAd();

return 0;
}

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Compilation time: 0.42 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,68 sec