add crete to ring buffer

bin/main.cpp

@@ -12,7 +12,8 @@ auto main(int argc, char *argv[]) -> int
 { 
   // patterns::ring_buffer
   {
-    hack::patterns::ring_buffer<int> rb(10);
+    hack::patterns::ring_buffer<int> rb;
+    rb.create(10);
     for (int i = 0; i < 10; ++i) rb.put(i);
     hack::log()(rb);
     hack::log()(rb.size());

src/hack/patterns/ring_buffer.hpp

@@ -15,6 +15,7 @@ namespace hack::patterns
     using MUTEX = std::lock_guard<std::recursive_mutex>;
 
     public:
+      ring_buffer() = default;
       explicit ring_buffer(int s)
       {
         m_size = s;
@@ -22,6 +23,13 @@ namespace hack::patterns
       };
 
     public:
+      void create(int s)
+      {
+        if (m_size > 0) return;
+        m_size = s;
+        m_data.resize(m_size);
+      }
+
       void put(T item) noexcept
       {
         MUTEX lock(m_mutex);
@@ -135,10 +143,10 @@ namespace hack::patterns
       }
     
     private:
-      std::size_t m_head{ 0 };
+      std::size_t m_head = 0;
-      std::size_t m_tail{ 0 };
+      std::size_t m_tail = 0;
-      std::size_t m_size;
+      std::size_t m_size = 0;
-      bool m_full{ false };
+      bool m_full = false;
 
     private:
       mutable std::recursive_mutex m_mutex;