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Add 'xo-unit/' from commit 'b531e382c2'

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git-subtree-dir: xo-unit
git-subtree-mainline: e9ee6992ca
git-subtree-split: b531e382c2
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Roland Conybeare 2025-05-10 21:29:43 -05:00
commit d1fa15f248
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49
xo-unit/example/ex2/ex2.cpp Normal file
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/** @file ex2.cpp **/
#include "xo/unit/quantity.hpp"
#include "xo/unit/quantity_iostream.hpp"
#include <iostream>
int
main () {
namespace q = xo::qty::qty;
namespace u = xo::qty::u;
using xo::qty::with_units_from;
using xo::qty::with_units;
using xo::qty::quantity;
using xo::flatstring;
using namespace std;
constexpr auto t = q::minutes(2);
constexpr auto d = q::kilometers(2.5);
constexpr auto t2 = t*t;
constexpr auto a = d / (t*t);
cerr << "t: " << t << ", d: " << d
<< ", t^2: " << t2
<< ", d.t^-2: " << a
<< endl;
constexpr auto a2 = a.rescale_ext<u::meter / (u::second * u::second)>();
static_assert(a2.abbrev() == flatstring("m.s^-2"));
cerr << "a2: " << a2 << endl;
constexpr auto a3 = with_units<u::meter / (u::second * u::second)>(a);
static_assert(a3.abbrev() == flatstring("m.s^-2"));
cerr << "a3: " << a3 << endl;
constexpr auto au = q::meter / (q::second * q::second);
constexpr auto a4 = with_units_from(a, au);
static_assert(a4.abbrev() == flatstring("m.s^-2"));
cerr << "a4: " << a4 << endl;
}
/** end ex2.cpp **/