New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/geometry/nearby_points_sweeper.cpp

@@ -0,0 +1,47 @@
+#include "geometry/nearby_points_sweeper.hpp"
+
+namespace m2
+{
+// NearbyPointsSweeper::Event ----------------------------------------------------------------------
+NearbyPointsSweeper::Event::Event(Type type, double y, double x, size_t index, uint8_t priority)
+  : m_type(type), m_y(y), m_x(x), m_index(index), m_priority(priority)
+{
+}
+
+bool NearbyPointsSweeper::Event::operator<(Event const & rhs) const
+{
+  if (m_y != rhs.m_y)
+    return m_y < rhs.m_y;
+
+  if (m_type != rhs.m_type)
+    return m_type < rhs.m_type;
+
+  if (m_x != rhs.m_x)
+    return m_x < rhs.m_x;
+
+  if (m_index != rhs.m_index)
+    return m_index < rhs.m_index;
+
+  return m_priority < rhs.m_priority;
+}
+
+// NearbyPointsSweeper -----------------------------------------------------------------------------
+NearbyPointsSweeper::NearbyPointsSweeper(double eps) : m_xEps(eps), m_yEps(eps)
+{
+  CHECK_GREATER_OR_EQUAL(m_xEps, 0.0, ());
+  CHECK_GREATER_OR_EQUAL(m_yEps, 0.0, ());
+}
+
+NearbyPointsSweeper::NearbyPointsSweeper(double xEps, double yEps) : m_xEps(xEps), m_yEps(yEps)
+{
+  CHECK_GREATER_OR_EQUAL(m_xEps, 0.0, ());
+  CHECK_GREATER_OR_EQUAL(m_yEps, 0.0, ());
+}
+
+void NearbyPointsSweeper::Add(double x, double y, size_t index, uint8_t priority)
+{
+  auto const yEpsHalf = 0.5 * m_yEps;
+  m_events.emplace_back(Event::TYPE_SEGMENT_START, y - yEpsHalf, x, index, priority);
+  m_events.emplace_back(Event::TYPE_SEGMENT_END, y + yEpsHalf, x, index, priority);
+}
+}  // namespace m2