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xo-unit: + natural_unit.from_bu()

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This commit is contained in:
Roland Conybeare 2024-04-27 07:58:50 -04:00
commit 1736237419
1 changed files with 32 additions and 28 deletions
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60
include/xo/unit/natural_unit.hpp
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@ -16,6 +16,34 @@ namespace xo {
template <typename Int>
class natural_unit;
namespace detail {
template <typename Int, typename... Ts>
constexpr void
push_bpu_array(natural_unit<Int> * p_target, Ts... args);
template <typename Int>
constexpr void
push_bpu_array(natural_unit<Int> * p_target) {}
template <typename Int, typename T0, typename... Ts>
constexpr void
push_bpu_array(natural_unit<Int> * p_target, T0 && bpu0, Ts... args) {
p_target->push_back(bpu0);
push_bpu_array(p_target, args...);
}
}
template <typename Int>
struct bpu_array_maker {
template <typename... Ts>
static constexpr natural_unit<Int>
make_bpu_array(Ts... args) {
natural_unit<Int> bpu_array;
detail::push_bpu_array(&bpu_array, args...);
return bpu_array;
}
};
/** @class natural_unit
* @brief an array representing the cartesian product of distinct basis-power-units
*
@ -35,6 +63,10 @@ namespace xo {
public:
constexpr natural_unit() : n_bpu_{0} {}
static constexpr natural_unit from_bu(basis_unit bu) {
return bpu_array_maker<Int>::make_bpu_array(make_unit_power<Int>(bu));
}
constexpr std::size_t n_bpu() const { return n_bpu_; }
constexpr bool is_dimensionless() const { return n_bpu_ == 0; }
@ -96,34 +128,6 @@ namespace xo {
bpu<Int> bpu_v_[n_dim];
};
namespace detail {
template <typename Int, typename... Ts>
constexpr void
push_bpu_array(natural_unit<Int> * p_target, Ts... args);
template <typename Int>
constexpr void
push_bpu_array(natural_unit<Int> * p_target) {}
template <typename Int, typename T0, typename... Ts>
constexpr void
push_bpu_array(natural_unit<Int> * p_target, T0 && bpu0, Ts... args) {
p_target->push_back(bpu0);
push_bpu_array(p_target, args...);
}
}
template <typename Int>
struct bpu_array_maker {
template <typename... Ts>
static constexpr natural_unit<Int>
make_bpu_array(Ts... args) {
natural_unit<Int> bpu_array;
detail::push_bpu_array(&bpu_array, args...);
return bpu_array;
}
};
namespace detail {
/**
* Given bpu ~ (b.u)^p: