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Support zero-dimensional points, matrices, and boxes

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This commit is contained in:
Nikita Lisitsa 2021-01-16 19:05:59 +03:00
parent a4c1eb17e9
commit 5d968accdb
5 changed files with 42 additions and 25 deletions
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3
libs/geom/include/psemek/geom/box.hpp
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@ -1,5 +1,6 @@
#pragma once #pragma once
#include <psemek/geom/detail/array.hpp>
#include <psemek/geom/interval.hpp> #include <psemek/geom/interval.hpp>
#include <psemek/geom/point.hpp> #include <psemek/geom/point.hpp>
@ -9,7 +10,7 @@ namespace psemek::geom
template <typename T, std::size_t N> template <typename T, std::size_t N>
struct box struct box
{ {
interval<T> axes[N]; detail::array<interval<T>, N>::type axes;
using point_type = point<T, N>; using point_type = point<T, N>;
using vector_type = vector<T, N>; using vector_type = vector<T, N>;

33
libs/geom/include/psemek/geom/detail/array.hpp Normal file
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@ -0,0 +1,33 @@
#pragma once
#include <exception>
namespace psemek::geom::detail
{
struct empty_array_exception
: std::exception
{
char const * what() const noexcept
{
return "Attempt to index a zero vector";
}
};
template <typename T, std::size_t N>
struct array
{
using type = T[N];
};
template <typename T>
struct array<T, 0>
{
struct type
{
T const & operator[](std::size_t) const { throw empty_array_exception{}; }
T & operator[](std::size_t) { throw empty_array_exception{}; }
};
};
}

3
libs/geom/include/psemek/geom/matrix.hpp
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@ -1,5 +1,6 @@
#pragma once #pragma once
#include <psemek/geom/detail/array.hpp>
#include <psemek/geom/vector.hpp> #include <psemek/geom/vector.hpp>
#include <algorithm> #include <algorithm>
@ -15,7 +16,7 @@ namespace psemek::geom
using scalar_type = T; using scalar_type = T;
T coords[R * C]; detail::array<T, R * C>::type coords;
T * operator[](std::size_t i) T * operator[](std::size_t i)
{ {

3
libs/geom/include/psemek/geom/point.hpp
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@ -1,5 +1,6 @@
#pragma once #pragma once
#include <psemek/geom/detail/array.hpp>
#include <psemek/geom/vector.hpp> #include <psemek/geom/vector.hpp>
namespace psemek::geom namespace psemek::geom
@ -12,7 +13,7 @@ namespace psemek::geom
using scalar_type = T; using scalar_type = T;
T coords[N]; detail::array<T, N>::type coords;
point() = default; point() = default;
point(point const &) = default; point(point const &) = default;

25
libs/geom/include/psemek/geom/vector.hpp
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@ -1,5 +1,7 @@
#pragma once #pragma once
#include <psemek/geom/detail/array.hpp>
#include <cstddef> #include <cstddef>
#include <utility> #include <utility>
#include <type_traits> #include <type_traits>
@ -9,27 +11,6 @@
namespace psemek::geom namespace psemek::geom
{ {
namespace detail
{
template <typename T, std::size_t N>
struct empty_array_helper
{
using type = T[N];
};
template <typename T>
struct empty_array_helper<T, 0>
{
struct type
{
T const & operator[](std::size_t) const { throw std::runtime_error("Attempt to index a zero vector"); }
T & operator[](std::size_t) { throw std::runtime_error("Attempt to index a zero vector"); }
};
};
}
template <typename T, std::size_t N> template <typename T, std::size_t N>
struct vector struct vector
{ {
@ -37,7 +18,7 @@ namespace psemek::geom
using scalar_type = T; using scalar_type = T;
detail::empty_array_helper<T, N>::type coords; detail::array<T, N>::type coords;
vector() = default; vector() = default;
vector(vector const &) = default; vector(vector const &) = default;