From 174eaf3228599dc9c2fb5b7de3842ab1820a3f4c Mon Sep 17 00:00:00 2001
From: Lucio Trincheri <ltrincheri@irobot.com>
Date: Fri, 13 Dec 2024 12:32:42 -0300
Subject: [PATCH] Re-add isEmpty method for future MultiDimInter implementation

---
 sbg/dto/interval_dto.cpp | 3 +++
 sbg/dto/interval_dto.hpp | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/sbg/dto/interval_dto.cpp b/sbg/dto/interval_dto.cpp
index 4532553..84baf31 100644
--- a/sbg/dto/interval_dto.cpp
+++ b/sbg/dto/interval_dto.cpp
@@ -30,6 +30,9 @@ IntervalDTO::IntervalDTO(const NAT &begin, const NAT &step, const NAT &end)
 {
 }
 
+// Set functions ---------------------------------------------------------------
+bool IntervalDTO::isEmpty() const { return end_ < begin_; }
+
 // Operators -------------------------------------------------------------------
 std::ostream &operator<<(std::ostream &out, const IntervalDTO &i) 
 {
diff --git a/sbg/dto/interval_dto.hpp b/sbg/dto/interval_dto.hpp
index aebbb94..0d70ada 100644
--- a/sbg/dto/interval_dto.hpp
+++ b/sbg/dto/interval_dto.hpp
@@ -44,6 +44,11 @@ struct IntervalDTO {
   IntervalDTO(const NAT &x);
   IntervalDTO(const NAT &begin, const NAT &step, const NAT &end);
 
+  /**
+   * @brief Traditional set operations.
+   */
+  bool isEmpty() const;
+
   private:
   NAT begin_;
   NAT step_;