[Plugin] Add C++ #ifdefs to public header files.

include/helper.h

@@ -27,7 +27,10 @@
 
 #ifndef ROFI_HELPER_H
 #define ROFI_HELPER_H
-
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 #include <cairo.h>
 #include "rofi-types.h"
 
@@ -336,4 +339,7 @@ void parse_ranges ( char *input, rofi_range_pair **list, unsigned int *length );
  * @param filter
  */
 void rofi_output_formatted_line ( const char *format, const char *string, int selected_line, const char *filter );
+#ifdef __cplusplus
+}
+#endif
 #endif // ROFI_HELPER_H

include/mode-private.h

@@ -27,7 +27,10 @@
 
 #ifndef ROFI_MODE_PRIVATE_H
 #define ROFI_MODE_PRIVATE_H
-
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 #include <gmodule.h>
 
 /** ABI version to check if loaded plugin is compatible. */
@@ -196,4 +199,7 @@ struct rofi_mode
     /** Module */
     GModule    *module;
 };
+#ifdef __cplusplus
+}
+#endif
 #endif // ROFI_MODE_PRIVATE_H

include/mode.h

@@ -27,7 +27,10 @@
 
 #ifndef ROFI_MODE_H
 #define ROFI_MODE_H
-
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 #include <cairo.h>
 #include "rofi-types.h"
 /**
@@ -236,4 +239,7 @@ char * mode_preprocess_input ( Mode *mode, const char *input );
  */
 char *mode_get_message ( const Mode *mode );
 /*@}*/
+#ifdef __cplusplus
+}
+#endif
 #endif

include/rofi-types.h

@@ -1,5 +1,9 @@
 #ifndef INCLUDE_ROFI_TYPES_H
 #define INCLUDE_ROFI_TYPES_H
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 
 #include <glib.h>
 
@@ -234,4 +238,7 @@ typedef struct rofi_int_matcher_t
     gboolean invert;
 } rofi_int_matcher;
 
+#ifdef __cplusplus
+}
+#endif
 #endif // INCLUDE_ROFI_TYPES_H