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xo-unit: examples: + ex7

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Roland Conybeare 2024-05-07 10:46:23 -04:00
commit 7d7a424a9f
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example/ex7/ex7.cpp Normal file
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/** @file ex7.cpp **/
#include "xo/unit/quantity.hpp"
#include "xo/unit/quantity_iostream.hpp"
#include <iostream>
int
main () {
//namespace u = xo::unit::units;
using namespace xo::qty;
//namespace su = xo::qty::su;
namespace q = xo::qty::qty;
using namespace std;
quantity qty1 = 7.55 * q::kilometer / q::minute / q::minute;
quantity qty2 = q::nanograms(123);
quantity qty3 = qty2 * qty1;
cerr << "qty1: " << qty1 << endl;
cerr << "qty2: " << qty2 << endl;
cerr << "qty3: " << qty3 << endl;
/* rescale to not-so-absurd units */
/* kg.m.s^-2 */
quantity res = qty3.rescale_ext<su::kilogram * su::meter / (su::second * su::second)>();
/* 2.57958e-10kg.m.s^-2 */
cerr << "res: " << res << endl;
}
/** end ex7.cpp */