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

Typically a {-1} exponent just means invert; i.e. h^{-1} = 1/h On Fri, Jan 9, 2009 at 3:59 PM, Mark Volkmann wrote:

On Jan 9, 2009, at 1:16 PM, Matthias Schabel wrote:

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Thanks!

Why does the the following simple code output "605 mi 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; }

The output code does not give special status to exponents of -1, but just treats them consistently. If you want specialized output, see examples/composite_output.cpp for an example.

Why is the exponent -1 in this example? I could understand if it was zero, but I don't think -1 makes sense.

--- Mark Volkmann

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