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#include <iostream>
#include <functional>
using namespace std;
 
template <typename F, typename S>
void doSome(F &func){
	S a;
	auto res = func(a);
	cout << res << "\n";
}
 
template<>
void doSome<typename F, int> (F &func){
	int a;
	a = 5;
	auto res = func(a);
	cout << res << "\n";
}
 
template<>
void dpSome<typename F, double> (F &func){
	double a;
	a = 5.5
	auto res = func(a);
	cout << res << "\n";
}
 
 
int main() {
	doSome([](int &a){
		a += 2;
	});
 
	doSome([](double &a){
		a += 2.5;
	});
	return 0;
}

prog.cpp:13:6: error: parse error in template argument list
 void doSome<typename F, int> (F &func){
      ^~~~~~~~~~~~~~~~~~~~~~~
prog.cpp:13:31: error: template-id ‘doSome<<expression error> >’ used as a declarator
 void doSome<typename F, int> (F &func){
                               ^
prog.cpp:13:31: error: variable or field ‘doSome’ declared void
prog.cpp:13:31: error: ‘F’ was not declared in this scope
prog.cpp:13:34: error: ‘func’ was not declared in this scope
 void doSome<typename F, int> (F &func){
                                  ^~~~
prog.cpp:21:12: error: expected initializer before ‘<’ token
 void dpSome<typename F, double> (F &func){
            ^
prog.cpp: In function ‘int main()’:
prog.cpp:32:3: error: no matching function for call to ‘doSome(main()::<lambda(int&)>)’
  });
   ^
prog.cpp:6:6: note: candidate: template<class F, class S> void doSome(F&)
 void doSome(F &func){
      ^~~~~~
prog.cpp:6:6: note:   template argument deduction/substitution failed:
prog.cpp:32:3: note:   couldn't deduce template parameter ‘S’
  });
   ^
prog.cpp:36:3: error: no matching function for call to ‘doSome(main()::<lambda(double&)>)’
  });
   ^
prog.cpp:6:6: note: candidate: template<class F, class S> void doSome(F&)
 void doSome(F &func){
      ^~~~~~
prog.cpp:6:6: note:   template argument deduction/substitution failed:
prog.cpp:36:3: note:   couldn't deduce template parameter ‘S’
  });
   ^

Standard output is empty