scheduled_point_rb_node_t: add ==, != operators

Problem: `scheduled_point_rb_node_t` needs `==` and `!=` operators to
simplify and improve equality testing for planner updates, assignment,
and copy construction.

Add the operators.

Author: milroy

resource/planner/c++/scheduled_point_tree.cpp

@@ -64,6 +64,18 @@ bool operator<(const int64_t lhs, const scheduled_point_rb_node_t &rhs) {
     return lhs < rhs.get_point ()->at;
 }
 
+bool scheduled_point_rb_node_t::operator== (
+         const scheduled_point_rb_node_t &other) const
+{
+    return this->get_point ()->at == other.get_point ()->at;
+}
+
+bool scheduled_point_rb_node_t::operator!= (
+         const scheduled_point_rb_node_t &other) const
+{
+    return !operator == (other);
+}
+
 
 /*******************************************************************************
  *                                                                             *

resource/planner/c++/scheduled_point_tree.hpp

@@ -43,6 +43,8 @@ struct scheduled_point_rb_node_t
            : public rb_node_base_t,
              public ygg::RBTreeNodeBase<scheduled_point_rb_node_t> {
     bool operator< (const scheduled_point_rb_node_t &other) const;
+    bool operator== (const scheduled_point_rb_node_t &other) const;
+    bool operator!= (const scheduled_point_rb_node_t &other) const;
 };
 
 using scheduled_point_rb_tree_t = ygg::RBTree<scheduled_point_rb_node_t,