update: using const ref instead of const ptr

src/all_cases/all_cases.cc

@@ -5,11 +5,11 @@ std::mutex AllCases::building;
 bool AllCases::available = false;
 std::vector<uint32_t> AllCases::data[];
 
-const std::vector<uint32_t> (*AllCases::fetch())[16] { // get all cases content
+const std::vector<uint32_t> (&AllCases::fetch())[16] { // get all cases content
     if (status() != AVAILABLE) {
         AllCases::build(); // all cases initialize
     }
-    return &AllCases::data; // return const ptr
+    return AllCases::data; // return const ref
 }
 
 AllCases::Status AllCases::status() { // get all cases status
@@ -36,20 +36,20 @@ void AllCases::build() { // ensure that all cases available
 }
 
 void AllCases::build_data() { // find all cases
-    auto basic_ranges = BasicRanges::fetch();
+    const auto &basic_ranges = BasicRanges::fetch();
     for (uint32_t head = 0; head < 15; ++head) { // address of 2x2 block
         if ((head & 0b11) == 0b11) {
             ++head; // skip invalid address
         }
         /// head -> 0/1/2 / 4/5/6 / 8/9/10 / 12/13/14
         data[head].reserve(ALL_CASES_SIZE[head]); // memory pre-allocated
-        for (auto index = 0; index < basic_ranges->size(); ++index) {
-            uint32_t broken = check_case(head, (*basic_ranges)[index]); // check and get broken address
-            auto range_rev = Common::range_reverse((*basic_ranges)[index]); // reversed range
+        for (auto index = 0; index < basic_ranges.size(); ++index) {
+            uint32_t broken = check_case(head, basic_ranges[index]); // check and get broken address
+            auto range_rev = Common::range_reverse(basic_ranges[index]); // reversed range
             if (broken) { // invalid case
                 auto delta = (uint32_t)1 << (32 - broken * 2); // this <--delta--> next possible range
-                auto min_next = (range_rev & ~(delta - 1)) + delta;
-                while (Common::range_reverse((*basic_ranges)[++index]) < min_next); // located next range
+                auto next_min = (range_rev & ~(delta - 1)) + delta;
+                while (Common::range_reverse(basic_ranges[++index]) < next_min); // located next range
                 --index;
             } else {
                 AllCases::data[head].emplace_back(range_rev); // release valid cases
@@ -89,5 +89,5 @@ int AllCases::check_case(uint32_t head, uint32_t range) { // check the head and
                 break;
         }
     }
-    return 0; // pass
+    return 0; // pass check
 }

src/all_cases/all_cases.h

@@ -16,7 +16,7 @@ class AllCases : public BasicRanges {
 public:
     static void build();
     static enum Status status();
-    static const std::vector<uint32_t> (*fetch())[16];
+    static const std::vector<uint32_t> (&fetch())[16];
 
 private:
     static bool available;
@@ -24,7 +24,5 @@ private:
     static std::vector<uint32_t> data[16];
 
     static void build_data();
-
     static int check_case(uint32_t head, uint32_t range);
-
 };

src/all_cases/basic_ranges.cc

@@ -7,11 +7,11 @@ std::mutex BasicRanges::building;
 bool BasicRanges::available = false;
 std::vector<uint32_t> BasicRanges::data;
 
-const std::vector<uint32_t>* BasicRanges::fetch() { // get basic ranges content
+const std::vector<uint32_t>& BasicRanges::fetch() { // get basic ranges content
     if (status() != AVAILABLE) {
         BasicRanges::build(); // basic ranges initialize
     }
-    return &BasicRanges::data; // return const ptr
+    return BasicRanges::data; // return const ref
 }
 
 BasicRanges::Status BasicRanges::status() { // get basic ranges status

src/all_cases/basic_ranges.h

@@ -15,7 +15,7 @@ public:
     };
     static void build();
     static enum Status status();
-    static const std::vector<uint32_t>* fetch();
+    static const std::vector<uint32_t>& fetch();
 
 private:
     struct generate_t {

src/main.cc

@@ -242,19 +242,22 @@ int main() {
 //    }
 
 //    BasicRanges::build();
-//    std::cout << "size: " << BasicRanges::fetch()->size() << std::endl;
+//    const auto &br = BasicRanges::fetch();
+//    br.push_back(123);
+//    std::cout << "size: " << BasicRanges::fetch().size() << std::endl;
+//    std::cout << "size: " << br.size() << std::endl;
 //    for (const auto &range : *BasicRanges::fetch()) {
 //        printf("%08X\n", range);
 //    }
 
     AllCases::build();
 
-    for (auto head = 0; head < 16; ++head) {
-        uint64_t prefix = (uint64_t)head << 32;
-        for (const auto &range : (*AllCases::fetch())[head]) {
-            printf("%09lX\n", prefix | range);
-        }
-    }
+//    for (auto head = 0; head < 16; ++head) {
+//        uint64_t prefix = (uint64_t)head << 32;
+//        for (const auto &range : AllCases::fetch()[head]) {
+//            printf("%09lX\n", prefix | range);
+//        }
+//    }
 
     std::cerr << (clock() - start_time) * 1000 / CLOCKS_PER_SEC << "ms" << std::endl;
 //    std::cerr << (clock() - start_time) * 1000000 / CLOCKS_PER_SEC << "us" << std::endl;

src/short_code/convert.cc

@@ -26,7 +26,7 @@ uint32_t ShortCode::tiny_encode(uint64_t common_code) { // common_code --low-mem
     auto target = Common::range_reverse((uint32_t)common_code); // target range
 
     for (int index = 0; index < BASIC_RANGES_INDEX[prefix]; ++index) { // traverse basic ranges
-        uint32_t range = (*BasicRanges::fetch())[index + BASIC_RANGES_OFFSET[prefix]];
+        uint32_t range = BasicRanges::fetch()[index + BASIC_RANGES_OFFSET[prefix]];
         if (range == target) {
             break; // found target range
         }
@@ -55,7 +55,7 @@ uint64_t ShortCode::tiny_decode(uint32_t short_code) { // short_code --low-memor
 
     uint32_t range;
     for (int index = 0; index < BASIC_RANGES_INDEX[prefix]; ++index) { // traverse basic ranges
-        range = (*BasicRanges::fetch())[index + BASIC_RANGES_OFFSET[prefix]];
+        range = BasicRanges::fetch()[index + BASIC_RANGES_OFFSET[prefix]];
         if (Common::check_case(head, range)) { // search for valid cases
             if (short_code == 0) {
                 break; // found target range

src/short_code/data_loader.cc

@@ -37,7 +37,7 @@ void ShortCode::build_mappings() { // build fast search mappings
     if (map_building.try_lock()) { // lock success -> start building
         for (int head = 0; head < 16; ++head) {
             uint64_t prefix = (uint64_t)head << 32;
-            for (const auto &range : (*AllCases::fetch())[head]) { // blocking function
+            for (const auto &range : AllCases::fetch()[head]) { // blocking function
                 all_cases_list.emplace_back(prefix | range); // short_code -> common_code
             }
         }