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#include <iostream>
 
void print(int i, std::string s){
    std::cout << i << s;
}
 
bool print(std::pair<int, std::string> const & p){
    print(p.first, p.second);
    return true;
}
bool ea(){
     return true;
}
 
template<typename ... T>
bool ea(std::pair<int, std::string> const & p, T&& ... t){
    return print(p) && ea(std::forward<T>(t)...);
}
 
template<typename ... T>
bool ea(std::pair<int, std::string> const & p, T&& ... t){
    return print(p) && ea(std::forward<T>(t)...);
}
int main() {
    ea({1, "a"}, {2, "b"});
	return 0;
}
 
 
 

prog.cpp:21:6: error: redefinition of ‘template<class ... T> bool ea(const std::pair<int, std::__cxx11::basic_string<char> >&, T&& ...)’
 bool ea(std::pair<int, std::string> const & p, T&& ... t){
      ^~
prog.cpp:16:6: note: ‘template<class ... T> bool ea(const std::pair<int, std::__cxx11::basic_string<char> >&, T&& ...)’ previously declared here
 bool ea(std::pair<int, std::string> const & p, T&& ... t){
      ^~
prog.cpp: In function ‘int main()’:
prog.cpp:25:26: error: no matching function for call to ‘ea(<brace-enclosed initializer list>, <brace-enclosed initializer list>)’
     ea({1, "a"}, {2, "b"});
                          ^
prog.cpp:11:6: note: candidate: ‘bool ea()’
 bool ea(){
      ^~
prog.cpp:11:6: note:   candidate expects 0 arguments, 2 provided
prog.cpp:16:6: note: candidate: ‘bool ea(const std::pair<int, std::__cxx11::basic_string<char> >&, T&& ...) [with T = {}]’
 bool ea(std::pair<int, std::string> const & p, T&& ... t){
      ^~
prog.cpp:16:6: note:   candidate expects 1 argument, 2 provided

Standard output is empty