test fixture float2 has a ctor time computed hash member for performance

test/graph/fixture.hpp

@@ -3,11 +3,16 @@
 
 #include <cmath>
 
+inline std::size_t hash_f(float f) { return std::hash<float>()(f); }
+inline std::size_t hash_2f(float f1, float f2) { return hash_f(f1) ^ (hash_f(f2) << 1); }
+
 struct float2 {
-  float x, y;
+  typedef float value_type;
+  value_type x, y;
+  std::size_t h;
 
-  inline float2() : x(0.0), y(0.0) {}
-  inline float2(float f1, float f2) : x(f1), y(f2) {}
+  constexpr float2() : x(0.0), y(0.0), h(0) {}
+  float2(value_type f1, value_type f2) : x(f1), y(f2), h(hash_2f(f1, f2)) {}
 };
 
 inline bool operator ==(const float2& v1, const float2& v2) { return v1.x == v2.x && v1.y == v2.y; }
@@ -15,16 +20,13 @@ inline float pow2(float f) { return f*f; }
 inline float dist(const float2& v1, const float2& v2) { return sqrt(pow2(v2.x - v1.x) + pow2(v2.y - v1.y)); }
 // inline float dist(const float2& v1, const float2& v2) { return abs(v2.x - v1.x) + abs(v2.y - v1.y); }
 
+
+
 namespace std {
   template <>
   struct hash<float2>
   {
-    std::size_t operator()(const float2& f2) const
-    {
-      std::size_t h1 = std::hash<float>()(f2.x);
-      std::size_t h2 = std::hash<float>()(f2.y);
-      return h1 ^ (h2 << 1);
-    }
+    std::size_t operator()(const float2& f2) const { return f2.h; }
   };
 
   class distanceOf2float2s : public std::function<float(float2, float2)>

test/graph/test_graph.hpp

@@ -555,6 +555,7 @@ TEST_CASE_METHOD(Fixture<float2>, "Graph performance", "[graph][data_structure][
   SECTION("Adding edges") {
     const std::vector<typename Graph<float2>::Edge> edges = Fixture<float2>::getEdges();
     Graph<float2> g(edges);
+    REQUIRE( numberOfEdges(g) == number_of_edges );
   }
 
   SECTION("teardown") {

test/graph/test_graph_algorithms.hpp

@@ -99,12 +99,10 @@ TEST_CASE("Graph algorithms, small", "[graph][algorithm][dijkstra]" ) {
 
 }
 
-TEST_CASE_METHOD(Fixture<float2>, "Graph algorithms, big graph", "[graph][algorithm][dijkstra]" ) {
+TEST_CASE_METHOD(Fixture<float2>, "Graph algorithms, big graph", "[graph][algorithm][dijkstra][performance]" ) {
 
-  constexpr std::size_t number_of_rows = 100;
+  constexpr std::size_t number_of_rows = 300;
   constexpr std::size_t number_of_columns = number_of_rows;
-  constexpr std::size_t number_of_vertices = number_of_rows * number_of_columns;
-  constexpr std::size_t number_of_edges = numberOfEdges(number_of_rows, number_of_columns);
 
   Fixture<float2>::initOnce(number_of_rows, number_of_columns);