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Consider this C++1y code ( LIVE EXAMPLE ): #include <iostream> auto foo(); int main() { std::cout << foo(); // ERROR! } auto foo() { return 1234; } The compiler (GCC 4.8.1) generously shoots out this error: main.cpp: In function ‘int main()’: main.cpp:8:18: error: use of ‘auto foo()’ before deduction of ‘auto’ std::cout << foo(); ^ How do I forward-declare foo() here? Or maybe more appropriately, is it possible to forward-declare foo() ? I've also tried compiling code where I tried to declare foo() in the .h file, defined foo() just like the one above in a .cpp file, included the .h in my main.cpp file containing int main() and the call to foo() , and built them. The same error occurred.
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