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xo-unit: + di_replace_basis_scale

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Roland Conybeare 2024-04-05 01:38:36 -04:00
commit 34214f571d
1 changed files with 43 additions and 1 deletions
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44
include/xo/unit/dimension_impl.hpp
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@ -180,7 +180,7 @@ namespace xo {
using dim_type = typename Dim::rest_type;
};
// ----- bpu_list -----
// ----- bpu_node -----
/** Represents the cartesian product of a list of 'native basis power units';
* represents something with dimensions
@ -234,6 +234,48 @@ namespace xo {
static constexpr std::uint32_t n_dimension = 1;
};
// ----- di_replace_basis_scale -----
/**
* @brief Replace BpuList member with matching BasisDim, preserving everything except (inner) scalefactor
**/
template <typename BpuList, typename NewBpu>
struct di_replace_basis_scale;
template <typename Front, typename Rest, typename NewBpu, bool MatchesFront = (Front::c_native_dim == NewBpu::c_native_dim)>
struct di_replace_basis_scale_aux;
/** specialization for non-empty BpuList **/
template <typename BpuList, typename NewBpu>
struct di_replace_basis_scale {
using type = di_replace_basis_scale_aux<typename BpuList::front_type,
typename BpuList::rest_type,
NewBpu>::type;
};
/** specialization for empty BpuList -- error not found **/
template <typename NewBpu>
struct di_replace_basis_scale<void, NewBpu> {};
/** specialization for matching front **/
template <typename Front, typename Rest, typename NewBpu>
struct di_replace_basis_scale_aux<Front, Rest, NewBpu, /*MatchesFront*/ true> {
using _replace_bpu_type = bpu<Front::c_native_dim,
typename NewBpu::scalefactor_type,
typename Front::power_type>;
static_assert(native_bpu_concept<_replace_bpu_type>);
/* NewBpu replaces Front */
using type = bpu_node<_replace_bpu_type, Rest>;
};
template <typename Front, typename Rest, typename NewBpu>
struct di_replace_basis_scale_aux<Front, Rest, NewBpu, /*MatchesFront*/ false> {
/* keep Front, replace NewBpu in rest */
using type = bpu_node<Front, typename di_replace_basis_scale<Rest, NewBpu>::type>;
};
// ----- bpu_cartesian_product -----
/** Require: