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xo-unit: streamlined ex2

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This commit is contained in:
Roland Conybeare 2024-05-03 18:45:37 -04:00
commit dd643109cc
2 changed files with 30 additions and 9 deletions
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2
example/ex2/CMakeLists.txt
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@ -10,6 +10,6 @@ xo_include_options2(${SELF_EXE})
# dependencies..
xo_self_headeronly_dependency(${SELF_EXE} xo_unit)
#xo_dependency(${SELF_EXE} reflect)
xo_dependency(${SELF_EXE} xo_flatstring)
# end CMakeLists.txt

37
example/ex2/ex2.cpp
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@ -1,20 +1,41 @@
/** @file ex2.cpp **/
#include "xo/unit/mpl/quantity.hpp"
#include "xo/unit/quantity.hpp"
#include "xo/unit/quantity_iostream.hpp"
#include <iostream>
int
main () {
namespace u = xo::unit::units;
namespace qty = xo::unit::qty;
using xo::unit::quantity;
namespace q = xo::qty::qty;
namespace su = xo::qty::su;
using xo::qty::with_units;
using xo::qty::quantity;
using xo::flatstring;
using namespace std;
quantity<u::second> t = qty::milliseconds(10);
quantity<u::gram> m = qty::kilograms(2.5);
auto a = m / (t*t);
constexpr auto t = q::minutes(2);
constexpr auto d = q::kilometers(2.5);
cerr << "t: " << t << ", m: " << m << ", m.t^-2: " << a << endl;
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.template rescale<su::meter / (su::second * su::second)>();
static_assert(a2.abbrev() == flatstring("m.s^-2"));
cerr << "a2: " << a2 << endl;
constexpr auto au = q::meter / (q::second * q::second);
constexpr auto a3 = with_units(a, au);
static_assert(a3.abbrev() == flatstring("m.s^-2"));
cerr << "a3: " << a3 << endl;
}
/** end ex2.cpp **/