Forward: some functions need to forward one or more real parameters along with their types to other functions.

16.47 compile your own version of the flip function and test it by calling the function that accepts the left and right reference parameters.

# Include <iostream> # include <string> # include <utility> using namespace STD; Template <typename T> int compare (const T & A, const T & B) {if (a <B) Return-1; if (B <a) return 1; return 0;} template <typename T> auto sum (t a, t B) -> decltype (a + B) {return a + B;} // flip function template <typename F, typename T1, typename T2> void flip (f, t1 & T1, T2 & T2) {f (STD: Forward <t2> (T2), STD: Forward <t1> (T1 ));} void F (INT V1, Int & V2) {cout <V1 <"" <++ V2 <Endl;} void g (Int & I, int & J) {cout <I <"" <j <Endl ;}int main () {Int J = 8; compare <const char *> ("hi", "world"); flip (F, J, 42); cout <j <Endl; flip (G, J, 42 );}

 

Forward: some functions need to forward one or more real parameters along with their types to other functions.