53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
/** @file ex1.cpp **/
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#include "xo/unit/quantity.hpp"
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#include "xo/unit/quantity_iostream.hpp"
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#include <iostream>
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int
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main () {
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namespace q = xo::qty::qty;
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namespace su = xo::qty::su;
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using xo::qty::quantity;
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using xo::flatstring;
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using namespace std;
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constexpr auto t = q::minutes(2);
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constexpr auto d = q::kilometers(2.5);
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constexpr auto t2 = t*t;
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constexpr auto a = d / (t*t);
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cerr << "t: " << t << ", d: " << d
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<< ", t^2: " << t2
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<< ", d.t^-2: " << a
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<< endl;
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static_assert(std::same_as<decltype(t)::repr_type, int>);
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static_assert(sizeof(t) == sizeof(int));
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static_assert(t.scale() == 2);
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static_assert(t.abbrev() == flatstring("min"));
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static_assert(std::same_as<decltype(d)::repr_type, double>);
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static_assert(sizeof(d) == sizeof(double));
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static_assert(d.scale() == 2.5);
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static_assert(d.abbrev() == flatstring("km"));
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static_assert(std::same_as<decltype(t2)::repr_type, int>);
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static_assert(sizeof(t2) == sizeof(int));
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static_assert(t2.scale() == 4);
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static_assert(t2.abbrev() == flatstring("min^2"));
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static_assert(std::same_as<decltype(a)::repr_type, double>);
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static_assert(sizeof(a) == sizeof(double));
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static_assert(a.scale() == 0.625);
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static_assert(a.abbrev() == flatstring("km.min^-2"));
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constexpr auto a2 = a.rescale<(su::meter / (su::second * su::second))>();
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cerr << "d.t^-2: " << a2 << endl;
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static_assert(a2.abbrev() == flatstring("m.s^-2"));
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}
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/** end ex1.cpp **/
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