refactor: add bytecode to module

furvm/include/furvm/module.hpp

@@ -1,11 +1,25 @@
 #ifndef FURVM_MODULE_HPP
 #define FURVM_MODULE_HPP
 
+#include "furvm/fwd.hpp"
+
+#include <vector>
+
 namespace furvm {
 
 class mod {
 public:
-    mod()  = default;
+    using bytecode_t = std::vector<byte>; /**< An alias to a vector of bytes. */
+public:
+    /**
+     * @brief Construct a new module.
+     *
+     * @param args Arguments to forward to bytecode's constructor.
+     */
+    template <typename... Args, typename = std::enable_if_t<std::is_constructible_v<bytecode_t, Args...>>>
+    mod(Args&&... args)
+      : m_bytecode(std::forward<Args>(args)...) {}
+
     ~mod() = default;
 
     /**
@@ -21,6 +35,7 @@ public:
     mod(const mod&)            = delete;
     mod& operator=(const mod&) = delete;
 private:
+    bytecode_t m_bytecode;
 };
 
 } // namespace furvm