使用std :: accumulate

对计算器和主要功能进行更改.

struct Calculator
{
    double operator() ( double result, const Object& obj )
    {
        return result + ( obj.GetA() * obj.GetB());
    }

};

int main()
{
    std::vector< Object > collection;
    collection.push_back( Object( 1, 2 ) );
    collection.push_back( Object( 3, 4 ) );

    double result = std::accumulate( collection.begin(), collection.end(), 0, Calculator() );
    std::cout << "result = " << result << std::endl;

    return 0;
}

它也可能更好:

double sumABProduct( double result, const Object& obj )
{
    return result + ( obj.GetA() * obj.GetB());
}

double result = std::accumulate( collection.begin(), collection.end(), 0, sumABProduct );