using of std::accumulate

Question

Need prettier solution of below example but with std::accumulate.

#include 
#include 
#include 

class Object
{
pu         


        

Answer 1

One would hope this is homework...

struct Adapt { 
    static double mul(Object const &x) { return x.GetA() * x.GetB(); }
    static double operator()(Object const &x, Object const &y) { 
       return mul(x)+mul(y); } };

and

result = std::accumulate(collection.begin(), collection.end(), Object(0,0),Adapt() );

assuming you're not allowed to touch the declaration of Object.