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#include <iostream>
using namespace std;
 
template<int a> class T{
	namespace A{
		int f1();
		int f2();
	}
	namespace B{
		int f1();
		int f2();
	}
public:
	void test();
};
 
template<int a> void T<a>::test(){cout<<a<<A::f1()<<A::f2()<<B::f1()<<B::f2();}
template<int a> int T<a>::A::f1(){return a+1;}
template<int a> int T<a>::A::f2(){return a-1;}
template<int a> int T<a>::B::f1(){return a*2;}
template<int a> int T<a>::B::f2(){return a*3;}
 
int main() {
	T<2> t;
	t.test();
	return 0;
}

prog.cpp:5:2: error: expected unqualified-id before 'namespace'
  namespace A{
  ^
prog.cpp:9:2: error: expected unqualified-id before 'namespace'
  namespace B{
  ^
prog.cpp: In member function 'void T<a>::test()':
prog.cpp:17:44: error: 'A' has not been declared
 template<int a> void T<a>::test(){cout<<a<<A::f1()<<A::f2()<<B::f1()<<B::f2();}
                                            ^
prog.cpp:17:53: error: 'A' has not been declared
 template<int a> void T<a>::test(){cout<<a<<A::f1()<<A::f2()<<B::f1()<<B::f2();}
                                                     ^
prog.cpp:17:62: error: 'B' has not been declared
 template<int a> void T<a>::test(){cout<<a<<A::f1()<<A::f2()<<B::f1()<<B::f2();}
                                                              ^
prog.cpp:17:71: error: 'B' has not been declared
 template<int a> void T<a>::test(){cout<<a<<A::f1()<<A::f2()<<B::f1()<<B::f2();}
                                                                       ^
prog.cpp: At global scope:
prog.cpp:18:21: error: 'T<a>::A' is not a type
 template<int a> int T<a>::A::f1(){return a+1;}
                     ^
prog.cpp:18:33: error: invalid use of dependent type 'typename T<a>::A'
 template<int a> int T<a>::A::f1(){return a+1;}
                                 ^
prog.cpp:19:21: error: 'T<a>::A' is not a type
 template<int a> int T<a>::A::f2(){return a-1;}
                     ^
prog.cpp:19:33: error: invalid use of dependent type 'typename T<a>::A'
 template<int a> int T<a>::A::f2(){return a-1;}
                                 ^
prog.cpp:20:21: error: 'T<a>::B' is not a type
 template<int a> int T<a>::B::f1(){return a*2;}
                     ^
prog.cpp:20:33: error: invalid use of dependent type 'typename T<a>::B'
 template<int a> int T<a>::B::f1(){return a*2;}
                                 ^
prog.cpp:21:21: error: 'T<a>::B' is not a type
 template<int a> int T<a>::B::f2(){return a*3;}
                     ^
prog.cpp:21:33: error: invalid use of dependent type 'typename T<a>::B'
 template<int a> int T<a>::B::f2(){return a*3;}
                                 ^

Standard output is empty