Added dynamic_library utility

Utilities/dynamic_library.cpp

@@ -0,0 +1,60 @@
+#include "stdafx.h"
+#include "dynamic_library.h"
+
+#ifdef _WIN32
+	#include <Windows.h>
+#else
+	#include <dlfcn.h>
+#endif
+
+namespace utils
+{
+	dynamic_library::dynamic_library(const std::string &path)
+	{
+		load(path);
+	}
+
+	dynamic_library::~dynamic_library()
+	{
+		close();
+	}
+
+	bool dynamic_library::load(const std::string &path)
+	{
+#ifdef _WIN32
+		m_handle = LoadLibraryA(path.c_str());
+#else
+		m_handle = dlopen(path.c_str(), RTLD_LAZY);
+#endif
+		return loaded();
+	}
+
+	void dynamic_library::close()
+	{
+#ifdef _WIN32
+		FreeLibrary((HMODULE)m_handle);
+#else
+		dlclose(m_handle);
+#endif
+		m_handle = nullptr;
+	}
+
+	void *dynamic_library::get_impl(const std::string &name) const
+	{
+#ifdef _WIN32
+		return GetProcAddress((HMODULE)m_handle, name.c_str());
+#else
+		return dlsym(m_handle, (char *)name.c_str());
+#endif
+	}
+
+	bool dynamic_library::loaded() const
+	{
+		return !m_handle;
+	}
+
+	dynamic_library::operator bool() const
+	{
+		return loaded();
+	}
+}