added "err_out"

err_out/err_out.h

+#pragma once
+
+/*
+    This header should be used as an abstraction in an autopilot in order to:
+    - throw errors
+    - print error messages (cerr)
+    - print information messages (cout)
+
+    The goal is that the hardware_emulator can substitute its own function calls (dynamically loaded)
+    in order to properly transmit messages and errors from the autopilot.
+
+    In order to use the different implementations (standalone_err_out.cpp, ...) the correct file has to be compiled into the autopilot.
+*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+void throw_error(const char* type, const char* message);
+void print_cout(const char *message);
+void print_cerr(const char *message);
+
+
+#ifdef __cplusplus
+}
+#endif

err_out/standalone_err_out.cpp

+#include "err_out.h"
+#include <exception>
+#include <string>
+#include <iostream>
+
+/*
+    This "backend" for err_out.h just uses the standard outputs and throws a standard c++ exception.
+*/
+
+class StandaloneException : public std::exception {
+    std::string msg;
+public:
+    StandaloneException(const char* type, const char* message) : msg((std::string(type) + ": ") + message) {}
+    virtual const char* what() const throw()
+    {
+        return msg.c_str();
+    }
+};
+
+void throw_error(const char* type, const char* message) {
+    throw StandaloneException(type, message);
+}
+void print_cout(const char *message) {
+    std::cout << message;
+}
+void print_cerr(const char *message) {
+    std::cerr << message;
+}
\ No newline at end of file