Вывести сведения о книгах удовлетворяющих заданным условиям

#include <iostream>
#include <string>
#include <cstdlib>
 
typedef std::size_t T_year;
 
struct Book
{
    std::string name;
    std::string author;
    std::string publishingHouse;
    T_year      publication;
    T_year      receipt;
    //--------------------------------------------------------------------------
    friend std::ostream& operator << (std::ostream& stream, Book& b)
    {
        stream  << b.name << " by " << b.author             << std::endl
                << "publishing house " << b.publishingHouse << std::endl
                << "create in " << b.publication            << std::endl
                << "received in the library in " << b.receipt;
        return stream;
    }
};
 
int main(int argc, const char* argv[])
{
    const std::size_t size = 5;
    Book b[size];
    for(std::size_t i = 0; i < size; ++i)
        std::cin    >> b[i].name >> b[i].author >> b[i].publishingHouse
                    >> b[i].publication >> b[i].receipt;
    T_year year;
    std::cin >> year;
    const std::string   house("Mir");
    const T_year        lastNYears(5);
    std::cout << std::endl;
    for(std::size_t i = 0; i < size; ++i)
        if
        (
            (b[i].publishingHouse == house) && 
            (year - b[i].receipt <= lastNYears)
        )
            std::cout   << b[i] << std::endl
                        << "//-------------------------//" << std::endl;
    return 0;
}