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void baz();
void baz(int);
 
template<typename... Args, typename R>
void bar(R (*)(Args...));
 
template<typename... Args>
void foo()
{
	bar<Args...>(baz);
}
 
int main()
{
	foo<>();		  // Deduces baz()
	//bar<>(baz);	  // Ambiguous
	foo<int>();		  // Deduces baz(int)
	bar<int>(baz);	  // Deduces baz(int)
	//foo<void>();	  // Ambiguous
	//bar<void>(baz); // Ambiguous
}
 

/home/vbG5Ns/ccuvpvls.o: In function `main':
prog.cpp:(.text.startup+0x12): undefined reference to `baz()'
prog.cpp:(.text.startup+0x17): undefined reference to `void bar<, void>(void (*)())'
prog.cpp:(.text.startup+0x1e): undefined reference to `baz(int)'
prog.cpp:(.text.startup+0x23): undefined reference to `void bar<int, void>(void (*)(int))'
prog.cpp:(.text.startup+0x2a): undefined reference to `baz(int)'
prog.cpp:(.text.startup+0x2f): undefined reference to `void bar<int, void>(void (*)(int))'
collect2: error: ld returned 1 exit status

Standard output is empty