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#include <cstdio>
#include <functional>
template<class T>
void test(T t, std::function<void(T)> f) { f(t); }
//void test(T t, std::function<void(int)> f) { f(t); }
 
void PrintIt(int v){ printf("V=%d\n", v); };
 
 
int main(int argc, char *argv[]) {
    test(5, PrintIt);
}
 

prog.cpp: In function 'int main(int, char**)':
prog.cpp:11:20: error: no matching function for call to 'test(int, void (&)(int))'
     test(5, PrintIt);
                    ^
prog.cpp:11:20: note: candidate is:
prog.cpp:4:6: note: template<class T> void test(T, std::function<void(T)>)
 void test(T t, std::function<void(T)> f) { f(t); }
      ^
prog.cpp:4:6: note:   template argument deduction/substitution failed:
prog.cpp:11:20: note:   mismatched types 'std::function<void(T)>' and 'void (*)(int)'
     test(5, PrintIt);
                    ^

Standard output is empty