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refactor: conversions part of the custom_systems refactored to be more explicit

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Mateusz Pusz
2021-04-16 14:41:05 +02:00
parent a69b408661
commit 554323d3a6
1 changed files with 12 additions and 2 deletions
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14
example/custom_systems.cpp
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@@ -65,11 +65,21 @@ using length = quantity<dim_length, U, Rep>;
} // namespace fps } // namespace fps
} // namespace si } // namespace si
template<typename Q, typename U>
concept castable_to = Quantity<Q> && Unit<U> &&
requires (Q q) {
quantity_cast<U>(q);
};
void conversions() void conversions()
{ {
// constexpr auto fps_yard = fps::length<fps::yard>(1.); // fps::yard is not defined in terms of SI units (or vice-versa)
// std::cout << quantity_cast<si::kilometre>(fps_yard) << "\n"; // so the conversion between FPS and SI is not possible
static_assert(!castable_to<fps::length<fps::yard>, si::kilometre>);
// si::fps::yard is defined in terms of SI units
// so the conversion between FPS and SI is possible
static_assert(castable_to<si::fps::length<si::fps::yard>, si::kilometre>);
constexpr auto si_fps_yard = si::fps::length<si::fps::yard>(1.); constexpr auto si_fps_yard = si::fps::length<si::fps::yard>(1.);
std::cout << quantity_cast<si::kilometre>(si_fps_yard) << "\n"; std::cout << quantity_cast<si::kilometre>(si_fps_yard) << "\n";
} }