Apples and bears

apples.cpp

#include <iostream>

#include "phys/units/io.hpp"
#include "phys/units/quantity.hpp"

using namespace phys::units;
using namespace phys::units::io;

auto apple( unit( "apple", extend() ) );
auto box  ( unit( "box"  , extend() ) );

quantity operator "" _apple(unsigned long long x) { return x * apple; }
quantity operator "" _box  (unsigned long long x) { return x * box; } 

int main()
{
    std::cout << 
        "3 * box * 5 * apple/box = " << 
        (3 * box * 5 * apple/box )   << "\n" 
        << 
        "3_box * 5_apple/box = " << 
        (3_box * 5_apple/box )   << "\n";
}

#if 0
g++ -Wall -std=c++11 -I"D:/GitHub/PhysUnits-RT-git" -o apples.exe apples.cpp & apples.exe
3 * box * 5 * apple/box = 15 apple
3_box * 5_apple/box = 15 apple
#endif