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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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53
xo-unit/example/ex1/ex1.cpp Normal file
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/** @file ex1.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::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;
static_assert(std::same_as<decltype(t)::repr_type, int>);
static_assert(sizeof(t) == sizeof(int));
static_assert(t.scale() == 2);
static_assert(t.abbrev() == flatstring("min"));
static_assert(std::same_as<decltype(d)::repr_type, double>);
static_assert(sizeof(d) == sizeof(double));
static_assert(d.scale() == 2.5);
static_assert(d.abbrev() == flatstring("km"));
static_assert(std::same_as<decltype(t2)::repr_type, int>);
static_assert(sizeof(t2) == sizeof(int));
static_assert(t2.scale() == 4);
static_assert(t2.abbrev() == flatstring("min^2"));
static_assert(std::same_as<decltype(a)::repr_type, double>);
static_assert(sizeof(a) == sizeof(double));
static_assert(a.scale() == 0.625);
static_assert(a.abbrev() == flatstring("km.min^-2"));
constexpr auto a2 = a.rescale_ext<(u::meter / (u::second * u::second))>();
cerr << "d.t^-2: " << a2 << endl;
static_assert(a2.abbrev() == flatstring("m.s^-2"));
}
/** end ex1.cpp **/