decltype(auto) look_up_a_string_1() { return lookup1(); }
void look_up_a_string_2() { return lookup2(); }
friend void A::showB(B x) {}
friend void showB(B x) {}
friend void showB(B::SomeType x) {}
inline int add(int a, int b) {}
int8t Get_Tile_Value() {}

int8_t Get_Tile_Value() {}

B::type test() {};

// template
boost::optional<application> handle_key(application state, key_code key, coord size);

// pack expansion in function arguments
template<typename T...>
void foo(T... args) {}

test();

void A(): a(10) {}
explicit A(): a(10) {}