Move headers into include folder and add single header to include all reachability algorithms

include/algorithm/decremental_reachability.h

@@ -0,0 +1,28 @@
+#ifndef DECREMENTAL_REACHABILITY_H_
+#define DECREMENTAL_REACHABILITY_H_
+
+#include "graph/digraph.h"
+
+namespace algo {
+
+template<typename T>
+class DecrementalReachability {
+public:
+  virtual ~DecrementalReachability() {};
+
+  // This method is implemented and executed by all roditty and zwick
+  // algorithms, it constructs the data structures used in other operations
+  virtual void init() =0;
+
+  // Answer if vertex v is reachable from vertex u
+  virtual bool query(const T& u, const T& v) =0;
+
+  // Remove edge e(u,v) and maintain the transitive closure matrix
+  virtual void remove(const T& u, const T& v) =0;
+protected:
+  Digraph<T> G;
+};
+
+}; // namespace algo
+
+#endif