Add .clang-format and apply it

2020/puzzle-21-02.cc

@@ -19,9 +19,11 @@ using IngredientInfo = std::pair<unsigned, Allergens>;
 using IngredientMap = std::map<Ingredient, IngredientInfo>;
 using AllergenMap = std::map<Allergen, Ingredients>;
 
-class IngredientParser {
+class IngredientParser
+{
 public:
-  void add_recipe(std::string const &s) {
+  void add_recipe(std::string const& s)
+  {
     auto it = s.begin();
     Ingredients i;
     while (it != s.end()) {
@@ -33,10 +35,10 @@ public:
       it = ite;
       if (ingredient == "(contains") {
         break;
-      } else {
+      }
+      else {
         i.insert(ingredient);
-        auto [iit, success] =
-            ingredients_.insert({ingredient, {1, Allergens()}});
+        auto [iit, success] = ingredients_.insert({ingredient, {1, Allergens()}});
         if (!success) {
           iit->second.first++;
         }
@@ -44,8 +46,7 @@ public:
     }
 
     while (it != s.end()) {
-      auto ite = std::find_if(
-          it, s.end(), [](char c) -> bool { return c == ',' || c == ')'; });
+      auto ite = std::find_if(it, s.end(), [](char c) -> bool { return c == ',' || c == ')'; });
       auto allergen = std::string(it, ite);
       ++ite;
       while (ite != s.end() && *ite == ' ') {
@@ -56,18 +57,18 @@ public:
       if (!success) {
         Ingredients a;
         std::set_intersection(i.begin(), i.end(), insert_it->second.begin(),
-                              insert_it->second.end(),
-                              std::inserter(a, a.end()));
+                              insert_it->second.end(), std::inserter(a, a.end()));
         insert_it->second = a;
       }
     }
   }
 
-  unsigned clean_ingredients() {
-    for (auto const &kv : allergens_) {
+  unsigned clean_ingredients()
+  {
+    for (auto const& kv : allergens_) {
       auto allergen = kv.first;
       std::cout << "Allergen " << allergen << ":";
-      for (auto const &i : kv.second) {
+      for (auto const& i : kv.second) {
         std::cout << " " << i;
         auto it = ingredients_.find(i);
         assert(it != ingredients_.end());
@@ -77,10 +78,9 @@ public:
     }
 
     unsigned count = 0;
-    for (auto const &i : ingredients_) {
+    for (auto const& i : ingredients_) {
       if (i.second.second.size() == 0) {
-        std::cout << i.first << " is not an allergen, appears "
-                  << i.second.first << ".\n";
+        std::cout << i.first << " is not an allergen, appears " << i.second.first << ".\n";
         count += i.second.first;
       }
     }
@@ -88,23 +88,23 @@ public:
     return count;
   }
 
-  std::string dangerous_ingredients() {
+  std::string dangerous_ingredients()
+  {
     bool changed = true;
     Ingredients i;
     while (changed) {
       changed = false;
-      for (auto const &kv : allergens_) {
+      for (auto const& kv : allergens_) {
         if (kv.second.size() == 1) {
           auto it = kv.second.begin();
-          Ingredient const &ing = *it;
+          Ingredient const& ing = *it;
           auto [iit, success] = i.insert(ing);
           if (!success) {
             continue;
           }
           changed = true;
-          std::cout << "Allergen " << kv.first << " is in ingredient " << ing
-                    << "\n";
-          for (auto &kv2 : allergens_) {
+          std::cout << "Allergen " << kv.first << " is in ingredient " << ing << "\n";
+          for (auto& kv2 : allergens_) {
             if (kv2.second.size() != 1) {
               kv2.second.erase(ing);
             }
@@ -114,7 +114,7 @@ public:
     }
 
     std::string result;
-    for (auto const &kv : allergens_) {
+    for (auto const& kv : allergens_) {
       result += ",";
       result += *kv.second.begin();
     }
@@ -127,7 +127,8 @@ private:
   AllergenMap allergens_;
 };
 
-int main(void) {
+int main(void)
+{
   std::string line;
   IngredientParser parser;
   while (std::getline(std::cin, line)) {