017-expression-fold.cpp

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#include <tpf_output.hpp>
 
tpf::sstream stream;
auto nl = tpf::nl;
auto endl = tpf::endl;
 
template<typename Type1, typename Type2, typename... Types>
auto Divide(Type1 dividend, Type2 divisor, Types... args)
{
    auto divisors = 
        std::vector<Type1>{ static_cast<Type1>(args)... };
 
    dividend /= divisor;
 
    for(auto& d : divisors)
        dividend /= d;
 
    return dividend;
}
 
void test_divide()
{
    stream << "divide 2*3*5 with 3, 5 = " 
            << Divide(2*3*5, 3, 5) << endl;
}
 
template<typename Type1, typename... Types>
auto divide_fold(Type1 dividend, Types... args)
{
    return (dividend / ... / args);
}
 
void test_divide_fold()
{
    stream << "divide 2*3*5 with 3, 5 = " 
            << divide_fold(2*3*5, 3, 5) << endl;
}
 
int main()
{
    // test_divide();
    test_divide_fold();
}