Re: [Boost-users] getting started with Boost::Units

On Jan 8, 2009, at 5:08 PM, Steven Watanabe wrote:

AMDG

Mark Volkmann wrote:

...

The first thing I'm trying to do is determine how to represent a velocity in miles per hour. I haven't been able to figure it out from the documentation. Any hints would be appreciated.

// Get the associated base units #include #include // Create short typedefs for the components. typedef boost::units::us::mile_base_unit::unit_type mile_unit; typedef boost::units::metric::hour_base_unit::unit_type hour_unit; // make the unit for miles/hour typedef boost::units::divide_typeof_helper::type miles_per_hour;

quantity mph = 80.0*miles_per_hour();

...

I also need to figure out the best way to get string representations of quantities that include their units for output.

#include will give you operator<<.

Thanks! Why does the the following simple code output "605mi h^-1" instead of "605 mi/h"? Why is the "^-1" at the end? #include <iostream> #include #include #include using namespace boost::units; using namespace std; typedef us::mile_base_unit::unit_type mile_unit; typedef metric::hour_base_unit::unit_type hour_unit; typedef divide_typeof_helper::type miles_per_hour; int main() { quantity mph = 605.0 * miles_per_hour(); cout << mph << endl; return 0; } --- Mark Volkmann