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#include <iostream>
#include <functional>
#include <sstream>
#include <vector>
using namespace std;
 
int f1(int x) {
}
 
string f2(int x) {
}
 
long long f3(int x) {
}
 
template<class T>
function<string(int)> conv(function<T(int)> f) {
	return [&](int x) -> string {
		stringstream ss;
		ss << f(x);
		return ss.str();
	};
}
 
int main() {
 
	vector<function<string(int)>> funcs = {
		conv(f1),
	};
 
	return 0;
}

prog.cpp:8:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
prog.cpp:11:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
prog.cpp:14:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
prog.cpp:28:3: error: no matching function for call to 'conv'
                conv(f1),
                ^~~~
prog.cpp:17:23: note: candidate template ignored: could not match 'function<type-parameter-0-0 (int)>' against 'int (*)(int)'
function<string(int)> conv(function<T(int)> f) {
                      ^
3 warnings and 1 error generated.

Standard output is empty