Code cleanup and corrections

Runtime/rstl.hpp

@@ -18,10 +18,30 @@ template <class T, size_t N>
 class reserved_vector : public std::vector<T>
 {
 public:
-    reserved_vector() {this->reserve(N);}
-    reserved_vector(size_t n, const T& val) : std::vector<T>(n, val) { }
+    reserved_vector() { this->reserve(N); }
+    reserved_vector(size_t n, const T& val) : std::vector<T>(n, val) {}
 };
 
+template <class T, size_t N>
+class prereserved_vector
+{
+    size_t x0_size = 1;
+    T x4_data[N];
+
+public:
+    void set_size(size_t n)
+    {
+        if (n <= N)
+            x0_size = n;
+    }
+
+    void set_data(const T* data) { memmove(x4_data, data, sizeof(T) * x0_size); }
+
+    size_t size() const { return x0_size; }
+
+    T& back() const { x4_data[(x0_size == 0) ? 0 : x0_size - 1]; }
+    T& front() const { return x4_data[0]; }
+};
 }
 
 #endif // __RSTL_HPP__