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xo-unit: example: renovate ex4 to use xo::qty::quantity

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This commit is contained in:
Roland Conybeare 2024-05-04 11:37:58 -04:00
commit 6610193258
2 changed files with 18 additions and 14 deletions
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2
example/ex4/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

30
example/ex4/ex4.cpp
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@ -1,26 +1,30 @@
/** @file ex4.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 namespace std;
//namespace u = xo::qty::units;
namespace q = xo::qty::qty;
using xo::qty::with_repr;
/* 20% volatility over 250 days (approx number of trading days in one year) */
auto t1 = qty::milliseconds(1);
/* 10% volatility over 30 days */
auto t2 = qty::minutes(1);
auto t1 = q::milliseconds(1);
auto t2 = q::minutes(1);
auto r1 = t1 / t2.with_repr<double>();
auto r2 = t2 / t1.with_repr<double>();
auto r1 = t1 / with_repr<double>(t2);
static_assert(same_as<decltype(r1), double>);
static_assert(same_as<decltype(r2), double>);
static_assert(r1.is_dimensionless());
static_assert(!t2.is_dimensionless());
cerr << "t1: " << t1 << ", t2: " << t2 << ", t1/t2: " << r1 << ", t2/t1: " << r2 << endl;
/* r1_value: assignment compiles, since r1 dimensionless */
double r1_value = r1;
/* r2_value: assignment won't compile, 'cannot convert' error */
//double r2_value = t2;
std::cerr << "t1: " << t1 << ", t2: " << t2 << ", t1/t2: " << r1 << std::endl;
}
/** end ex4.cpp */