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struct blah
{
   template<class t>
   blah(void(*)(t), t){}
};
 
void Func(int i) {}
void Func2(int& i) {}
 
void test()
{
   int i = 3;
   blah b(Func, i);   
   blah b2(Func2, i);
}
 

prog.cpp: In function ‘void test()’:
prog.cpp:14:20: error: no matching function for call to ‘blah::blah(void (&)(int&), int&)’
prog.cpp:14:20: note: candidates are:
prog.cpp:4:4: note: template<class t> blah::blah(void (*)(t), t)
prog.cpp:4:4: note:   template argument deduction/substitution failed:
prog.cpp:14:20: note:   deduced conflicting types for parameter ‘t’ (‘int&’ and ‘int’)
prog.cpp:1:8: note: constexpr blah::blah(const blah&)
prog.cpp:1:8: note:   candidate expects 1 argument, 2 provided
prog.cpp:1:8: note: constexpr blah::blah(blah&&)
prog.cpp:1:8: note:   candidate expects 1 argument, 2 provided

Standard output is empty