refactor(furvm): better thing implementation

furvm/include/furvm/context.hpp

@@ -12,6 +12,7 @@ namespace furvm {
 class context {
 public:
     friend class executor;
+    friend class thing;
 public:
     context();
     ~context() = default;

furvm/include/furvm/executor.hpp

@@ -72,6 +72,7 @@ public:
      * @brief Returns a new executor.
      *
      * @param context Furvm context.
+     * @return Shared pointer to the new executor.
      */
     static executor_p create(const context_p& context);
 public:

furvm/include/furvm/thing.hpp

@@ -9,6 +9,14 @@ enum class thing_t : std::uint8_t {
     Int,
 };
 
+/**
+ * @brief Returns data size of a thing.
+ *
+ * @param type Type of the thing.
+ * @return The data size of the thing.
+ */
+std::size_t thing_type_size(thing_t type);
+
 class thing {
     friend class executor;
 private:
@@ -44,6 +52,15 @@ public:
 
     thing(const thing&)            = delete;
     thing& operator=(const thing&) = delete;
+public:
+    /**
+     * @brief Returns a new thing.
+     *
+     * @param context Furvm context.
+     * @param type Type of the new thing.
+     * @return Shared pointer to the new thing.
+     */
+    static thing_p create(const context_p& context, thing_t type);
 private:
     thing_handle m_id;
     thing_t      m_type;

furvm/src/thing.cpp

@@ -1,10 +1,33 @@
+// NOLINTBEGIN(cppcoreguidelines-no-malloc)
+
 #include "furvm/thing.hpp"
 
+#include "furvm/context.hpp" // IWYU pragma: keep
+
+#include <cstdlib>
+
 namespace furvm {
 
-thing::thing(rzecz, thing_handle id, thing_t type, const context_p& context)
-  : m_id(id), m_type(type), m_context(context) {}
+std::size_t thing_type_size(thing_t type) {
+    switch (type) {
+    case thing_t::Int: return 4;
+    }
+    return 0;
+}
 
-thing::~thing() {}
+thing::thing(rzecz, thing_handle id, thing_t type, const context_p& context)
+  : m_id(id), m_type(type), m_context(context), m_data(std::calloc(1, thing_type_size(type))) {}
+
+thing::~thing() {
+    std::free(m_data);
+}
+
+thing_p thing::create(const context_p& context, thing_t type) {
+    auto th = std::make_shared<thing>(rzecz{}, context->m_things.size(), type, context);
+    context->m_things.push_back(th);
+    return std::move(th);
+}
 
 } // namespace furvm
+
+// NOLINTEND(cppcoreguidelines-no-malloc)