ipfixprobe - introduce API function

Author: SiskaPavel

include/ipfixprobe/api.hpp

@@ -0,0 +1,33 @@
+/**
+ * @file
+ * @brief Definitions for API functions
+ * @author Pavel Siska <[email protected]>
+ * @date 2025
+ *
+ * Copyright (c) 2025 CESNET
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#pragma once
+
+/**
+ * \def IPXP_API
+ * \brief Macro for exporting public API symbols
+ *
+ * This macro is used to explicitly mark symbols that are part of the public API.
+ * If the compiler supports visibility attributes, it ensures that only symbols
+ * marked with this macro are exported, while others remain hidden.
+ *
+ * Using this macro helps reduce the symbol table size, improves load time,
+ * and minimizes symbol conflicts by keeping internal symbols hidden.
+ *
+ * Example usage:
+ * \code
+ * class IPXP_API MyClass {
+ * public:
+ *     void doSomething();
+ * };
+ * \endcode
+ */
+#define IPXP_API [[gnu::visibility("default")]]