53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
/** @file ex1.cpp **/
|
|
|
|
#include "xo/unit/quantity.hpp"
|
|
#include "xo/unit/quantity_iostream.hpp"
|
|
#include <iostream>
|
|
|
|
int
|
|
main () {
|
|
namespace q = xo::qty::qty;
|
|
namespace su = xo::qty::su;
|
|
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, double>);
|
|
static_assert(sizeof(t) == sizeof(double));
|
|
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, double>);
|
|
static_assert(sizeof(t2) == sizeof(double));
|
|
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<(su::meter / (su::second * su::second))>();
|
|
|
|
cerr << "d.t^-2: " << a2 << endl;
|
|
|
|
static_assert(a2.abbrev() == flatstring("m.s^-2"));
|
|
}
|
|
|
|
/** end ex1.cpp **/
|