From 0c3228e589bd51ea725969100f21dfa85e4bca3f Mon Sep 17 00:00:00 2001
From: Vissarion Fisikopoulos <fisikop@gmail.com>
Date: Mon, 14 Apr 2025 14:51:07 +0300
Subject: [PATCH] fix: Compilation errors and warnings in examples

---
 example/07_a_graph_route_example.cpp      | 5 ++---
 example/07_b_graph_route_example.cpp      | 5 ++---
 example/c04_a_custom_triangle_example.cpp | 2 +-
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/example/07_a_graph_route_example.cpp b/example/07_a_graph_route_example.cpp
index 1b6786771..6d0741277 100644
--- a/example/07_a_graph_route_example.cpp
+++ b/example/07_a_graph_route_example.cpp
@@ -17,11 +17,11 @@
 #include <iomanip>
 #include <limits>
 
-#include <boost/tuple/tuple.hpp>
+#include <boost/algorithm/string/trim.hpp>
 #include <boost/foreach.hpp>
-
 #include <boost/graph/adjacency_list.hpp>
 #include <boost/graph/dijkstra_shortest_paths.hpp>
+#include <boost/tuple/tuple.hpp>
 
 #include <boost/geometry/geometry.hpp>
 #include <boost/geometry/geometries/linestring.hpp>
@@ -46,7 +46,6 @@ void read_wkt(std::string const& filename, std::vector<Tuple>& tuples, Box& box)
         {
             std::string line;
             std::getline(cpp_file, line);
-            Geometry geometry;
             boost::trim(line);
             if (! line.empty() && ! boost::starts_with(line, "#"))
             {
diff --git a/example/07_b_graph_route_example.cpp b/example/07_b_graph_route_example.cpp
index ca39839e7..c2156abaa 100644
--- a/example/07_b_graph_route_example.cpp
+++ b/example/07_b_graph_route_example.cpp
@@ -21,11 +21,11 @@
 #include <iomanip>
 #include <limits>
 
-#include <boost/tuple/tuple.hpp>
+#include <boost/algorithm/string/trim.hpp>
 #include <boost/foreach.hpp>
-
 #include <boost/graph/adjacency_list.hpp>
 #include <boost/graph/dijkstra_shortest_paths.hpp>
+#include <boost/tuple/tuple.hpp>
 
 #include <boost/geometry/geometry.hpp>
 #include <boost/geometry/geometries/linestring.hpp>
@@ -51,7 +51,6 @@ void read_wkt(std::string const& filename, std::vector<Tuple>& tuples, Box& box)
         {
             std::string line;
             std::getline(cpp_file, line);
-            Geometry geometry;
             boost::trim(line);
             if (! line.empty() && ! boost::starts_with(line, "#"))
             {
diff --git a/example/c04_a_custom_triangle_example.cpp b/example/c04_a_custom_triangle_example.cpp
index 5b255e421..4ef5e6118 100644
--- a/example/c04_a_custom_triangle_example.cpp
+++ b/example/c04_a_custom_triangle_example.cpp
@@ -41,7 +41,7 @@ BOOST_GEOMETRY_REGISTER_RING(triangle)
 namespace boost { namespace geometry {
 
 template<>
-inline double area<triangle>(const triangle& t)
+inline auto area<triangle>(const triangle& t)
 {
     /*         C
               / \