added sqlite connection class (progress)

2023-11-07 23:07:49 +01:00
parent f4f5c00eec
commit 715f4dff8f
21 changed files with 645 additions and 73 deletions
@@ -0,0 +1,107 @@
+#ifndef QUERY_LIBRARY_HPP
+#define QUERY_LIBRARY_HPP
+
+#include <string>
+
+#if defined(_MSC_VER) || defined(__MINGW32__)
+#define _WINSOCKAPI_
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+namespace matador::utils {
+
+#ifndef MATADOR_DOXYGEN_DOC
+#if defined(_MSC_VER) || defined(__MINGW32__)
+typedef FARPROC func_ptr;
+#else
+typedef void *func_ptr;
+#endif
+#endif /* MATADOR_DOXYGEN_DOC */
+
+/**
+ * @class library
+ * @brief Helps to load and unload
+ *        external libraries.
+ *
+ * This class represents a loader and un-loader
+ * for an external library. The path to the library
+ * is given by a string.
+ * It can be loaded and unloaded. Furthermore it
+ * provides a method to get a pointer to an function
+ * exported by the library. The function is identified
+ * by a name.
+ */
+class library
+{
+public:
+  /**
+   * Create a unspecified library serializable
+   */
+  library() = default;
+
+  /**
+   * Create a library for the given lib path
+   *
+   * @param lib The path to the library to map.
+   */
+  explicit library(std::string lib);
+
+  ~library();
+
+  /**
+   * Load the underlying library.
+   * If the library path is invalid
+   * or the library cannot be loaded
+   * false is returned.
+   *
+   * @return True on successful library loading.
+   */
+  bool load();
+
+  /**
+   * Sets the library (and subsequently close and
+   * overwrite an already instantiated library) and
+   * load the underlying library. If the library
+   * path is invalid or the library cannot be loaded
+   * false is returned.
+   *
+   * @param lib The path to the library to load.
+   * @return True on successful library loading.
+   */
+  bool load(const std::string &lib);
+
+  /**
+   * Unload an loaded library. If
+   * the library isn't loaded or an
+   * error occurred while unloading
+   * false is returned.
+   *
+   * @return True on successful unloading.
+   */
+  bool unload();
+
+  /**
+   * Returns the pointer to the exported
+   * function of the library identified
+   * by the given name.
+   *
+   * @param f The name of the exported function.
+   * @return The pointer to the function.
+   */
+  [[nodiscard]] func_ptr function(const std::string &f) const;
+
+private:
+  std::string lib_;
+
+#if defined(_WIN32) || defined(__MINGW32__)
+  HMODULE handle_ = nullptr;
+#else
+  void *handle_ = nullptr;
+#endif
+};
+
+}
+
+#endif //QUERY_LIBRARY_HPP