Move solving logic to a separate class

CMakeLists.txt

@@ -8,6 +8,7 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(SOURCE_FILES
   solver/cell.cpp
   solver/puzzle.cpp
+  solver/solver.cpp
   solver.cpp
 )
 

solver.cpp

@@ -1,16 +1,13 @@
+#include "solver/solver.h"
+
 #include <iostream>
 
-#include "solver/puzzle.h"
-
 int main(int argc, char** argv) {
-  Puzzle puzzle = Puzzle::FromString(
+  Solver solver(
       "3..4.162.1...8.4....5.2.83..578........7..5.3..29.4..748.53..1.2.3.9...."
       ".7...6.9.");
-  while (puzzle.ApplyNextStep())
-    ;
-  if (!puzzle.IsSolved()) {
+  if (!solver.Solve()) {
     std::cout << "Error! Couldn't Solve" << std::endl;
   }
-  std::cout << "https://tiramisu.one/sudoku.html?p=" << puzzle.CurrentState()
-            << "&m=" << puzzle.PencilMarkState() << std::endl;
+  std::cout << solver.StateUrl() << std::endl;
 }

solver/solver.cpp

@@ -0,0 +1,20 @@
+#include "solver.h"
+
+#include <sstream>
+
+Solver::Solver(std::string string) : puzzle_(Puzzle::FromString(string)) {}
+
+bool Solver::Solve() {
+  while (puzzle_.ApplyNextStep()) {
+  }
+  return puzzle_.IsSolved();
+}
+
+std::string Solver::State() { return puzzle_.CurrentState(); }
+
+std::string Solver::StateUrl() {
+  std::ostringstream stream;
+  stream << "https://tiramisu.one/sudoku.html?p=" << puzzle_.CurrentState()
+         << "&m=" << puzzle_.PencilMarkState();
+  return stream.str();
+}

solver/solver.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "puzzle.h"
+
+class Solver {
+ public:
+  Solver(std::string puzz_string);
+  bool Solve();
+  std::string State();
+  std::string StateUrl();
+
+ private:
+  Puzzle puzzle_;
+};