add path struct

example/path.cpp

@@ -8,7 +8,7 @@ int main() {
     auto vars = cube.solve();
 
     for (size_t target = 1; target < vars.size(); target++) {
-        auto &action = vars.path[target];
+        auto &action = vars.path.get(target);
         std::cout << action.from_idx << " * " << action.gen << " = " << target << std::endl;
     }
 

include/tc/core.hpp

@@ -16,10 +16,26 @@ namespace tc {
         Action(int from_idx, int gen);
     };
 
+    struct Path {
+        std::vector<Action> path;
+
+        Path() = default;
+
+        Path(const Path &) = default;
+
+        void add_row();
+
+        [[nodiscard]] const Action get(int to_idx) const;
+
+        void put(int from_idx, int gen, int to_idx);
+
+        [[nodiscard]] size_t size() const;
+    };
+
     struct Cosets {
         int ngens;
         std::vector<int> data;
-        std::vector<Action> path;
+        Path path;
 
         Cosets(const Cosets &) = default;
 

src/core.cpp

@@ -8,21 +8,37 @@ namespace tc {
         : from_idx(from_idx), gen(gen) {
     }
 
+    void Path::add_row() {
+        path.resize(path.size() + 1);
+    }
+
+    const Action Path::get(int to_idx) const {
+        return path[to_idx];
+    }
+
+    void Path::put(int from_idx, int gen, int to_idx) {
+        path[to_idx] = Action(from_idx, gen);
+    }
+
+    size_t Path::size() const {
+        return path.size();
+    }
+
     Cosets::Cosets(int ngens)
         : ngens(ngens) {
     }
 
     void Cosets::add_row() {
         data.resize(data.size() + ngens, -1);
-        path.resize(path.size() + 1);
+        path.add_row();
     }
 
     void Cosets::put(int coset, int gen, int target) {
         data[coset * ngens + gen] = target;
         data[target * ngens + gen] = coset;
 
-        if (path[target].from_idx == -1) {
-            path[target] = Action(coset, gen);
+        if (path.get(target).from_idx == -1) {
+            path.put(coset, gen, target);
         }
     }
 
@@ -32,8 +48,8 @@ namespace tc {
         data[idx] = target;
         data[target * ngens + gen] = coset;
 
-        if (path[target].from_idx == -1) {
-            path[target] = Action(coset, gen);
+        if (path.get(target).from_idx == -1) {
+            path.put(coset, gen, target);
         }
     }