[Boost-users] [units] How to assign "ft" to an si::length?

Subject: [Boost-users] [units] How to assign "ft" to an si::length?
From: Terry Golubiewski (tjgolubi_at_[hidden])
Date: 2010-05-19 13:49:34

I am having trouble seeing how to use mixed units.
The program below compiles and runs.
See the changes I "wish" I could make as comments.

terry

#include <boost/units/systems/si.hpp>
#include <boost/units/base_units/us/foot.hpp>
#include <boost/units/quantity.hpp>
#include <boost/units/io.hpp>

#include <iostream>
#include <iomanip>

using namespace std;
using namespace boost;
using namespace boost::units;

int main() {
  static const si::length m = si::meter;
  // static const si::length ft = ???;
  typedef quantity<si::length> Length;
  Length x = 2.0 * m;
  Length y = 3.0 * m; // instead of "m" use "ft";
  cout << "x=" << x << " y=" << y << endl;
  Length z = x + y;
  cout << "x+y=" << z << endl; // display result in "ft"
  return 0;
} // main