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#pragma once
#include <cstddef>
#include <cmath>
#include <limits>
namespace floormat::entities::erased_constraints {
static_assert(sizeof(std::size_t) == sizeof(std::uintptr_t));
static_assert(sizeof(std::size_t) == sizeof(std::ptrdiff_t));
struct range final
{
using U = std::size_t;
using I = std::make_signed_t<U>;
enum type_ : unsigned char { type_none, type_float, type_uint, type_int, };
union element {
float f;
U u;
I i;
};
element min {.i = 0}, max {.i = 0};
type_ type = type_none;
template<typename T> constexpr std::pair<T, T> convert() const;
};
template<typename T> constexpr std::pair<T, T> range::convert() const
{
if constexpr (!std::is_floating_point_v<T> && !std::is_integral_v<T>)
return {{}, {}};
using std::size_t;
static_assert(sizeof(T) <= sizeof(size_t) || !std::is_integral_v<T>);
constexpr auto min_ = []<typename V>(V a, V b) { return a < b ? a : b; };
constexpr auto max_ = []<typename V>(V a, V b) { return a > b ? a : b; };
using limits = std::numeric_limits<T>;
constexpr auto lmin = limits::min(), lmax = limits::max();
switch (type) {
case type_float:
if constexpr (limits::is_integer())
return { T(std::floor(min.f)), T(std::ceil(max.f)) };
else
return { T(min.f), T(max.f) };
case type_uint: return { max_(T(min.u), lmin), T(min_(size_t(max.u), size_t(lmax))) };
case type_int: return { max_(T(min.i), lmin), T(min_(size_t(max.i), size_t(lmax))) };
default: case type_none: return { lmin, lmax };
}
}
struct length final {
std::size_t value = std::numeric_limits<std::size_t>::max();
constexpr operator std::size_t() const { return value; }
};
struct group final {
StringView group_name;
constexpr operator StringView() const { return group_name; }
constexpr group() = default;
constexpr group(StringView name) : group_name{name} {}
};
} // namespace floormat::entities::erased_constraints
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