optimize: project structure

include/errors.hpp

@@ -0,0 +1,16 @@
+#ifndef _ERRORS_HPP_
+#define _ERRORS_HPP_
+
+#include <functional>
+
+typedef enum {
+  errors_code_ok,
+  errors_code_sync_sycl_exception,
+  errors_code_std_exception,
+  errors_code_unknown_exception,
+} errors_code_enum_t;
+
+// failed try to exec fn, catch and print .what() when exception is thrown.
+errors_code_enum_t failed(std::function<void(void)> fn);
+
+#endif