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#pragma once
#include "Base.hpp"
namespace cru {
struct Range final {
constexpr static Range FromTwoSides(gsl::index start, gsl::index end) {
return Range(start, end - start);
}
constexpr static Range FromTwoSides(gsl::index start, gsl::index end,
gsl::index offset) {
return Range(start + offset, end - start);
}
constexpr Range() = default;
constexpr Range(const gsl::index position, const gsl::index count = 0)
: position(position), count(count) {}
gsl::index GetStart() const { return position; }
gsl::index GetEnd() const { return position + count; }
void ChangeEnd(gsl::index new_end) { count = new_end - position; }
Range Normalize() const {
auto result = *this;
if (result.count < 0) {
result.position += result.count;
result.count = -result.count;
}
return result;
}
Range CoerceInto(gsl::index min, gsl::index max) const {
auto coerce = [min, max](gsl::index index) {
return index > max ? max : (index < min ? min : index);
};
return Range::FromTwoSides(coerce(GetStart()), coerce(GetEnd()));
}
gsl::index position = 0;
gsl::index count = 0;
};
} // namespace cru
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