Add Lines class to allow LinesSolver to externalize access to its vector of string

src/Lines.cpp

@@ -0,0 +1,43 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024-2025  Stefan Müller
+//
+// This program is free software: you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free Software
+// Foundation, either version 3 of the License, or (at your option) any later
+// version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#include <aoc/Lines.hpp>
+
+#include <algorithm>
+
+bool Lines::isInBounds(const Point2& point) const
+{
+    return 0 <= point.y && point.y < size() &&
+        0 <= point.x && point.x < at(point.y).size();
+}
+
+char Lines::getCharAt(const Point2& point) const
+{
+    return at(point.y)[point.x];
+}
+
+void Lines::setCharAt(const Point2& point, const char value)
+{
+    at(point.y)[point.x] = value;
+}
+
+std::ostream& operator<<(std::ostream& os, const Lines& lines)
+{
+    for (const auto& line : lines)
+    {
+        os << line << std::endl;
+    }
+    return os;
+}

src/LinesSolver.cpp

@@ -27,16 +27,15 @@ void LinesSolver::processDataLine(const std::string& line)
 
 bool LinesSolver::isInBounds(const Point2& point) const
 {
-    return 0 <= point.y && point.y < lines.size() &&
-        0 <= point.x && point.x < lines[point.y].size();
+    return lines.isInBounds(point);
 }
 
 char LinesSolver::getCharAt(const Point2& point) const
 {
-    return lines[point.y][point.x];
+    return lines.getCharAt(point);
 }
 
 void LinesSolver::setCharAt(const Point2& point, const char value)
 {
-    lines[point.y][point.x] = value;
+    lines.setCharAt(point, value);
 }