*: remove remaining __cplusplus checks

src/ConfigGlobal.hxx

@@ -30,9 +30,7 @@
 #define DEFAULT_PLAYLIST_MAX_LENGTH (1024*16)
 #define DEFAULT_PLAYLIST_SAVE_ABSOLUTE_PATHS false
 
-#ifdef __cplusplus
 class Path;
-#endif
 
 void config_global_init(void);
 void config_global_finish(void);
@@ -43,17 +41,9 @@ void config_global_finish(void);
  */
 void config_global_check(void);
 
-#ifdef __cplusplus
-
 bool
 ReadConfigFile(const Path &path, GError **error_r);
 
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* don't free the returned value
    set _last_ to NULL to get first entry */
 gcc_pure
@@ -102,8 +92,4 @@ config_get_positive(enum ConfigOption option, unsigned default_value);
 gcc_pure
 bool config_get_bool(enum ConfigOption option, bool default_value);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif

src/DatabaseLock.hxx

@@ -82,8 +82,6 @@ db_unlock(void)
 	db_mutex.unlock();
 }
 
-#ifdef __cplusplus
-
 class ScopeDatabaseLock {
 public:
 	ScopeDatabaseLock() {
@@ -96,5 +94,3 @@ public:
 };
 
 #endif
-
-#endif

src/DecoderPlugin.hxx

@@ -187,10 +187,6 @@ decoder_plugin_container_scan(	const struct decoder_plugin *plugin,
 	return plugin->container_scan(pathname, tnum);
 }
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /**
  * Does the plugin announce the specified file name suffix?
  */
@@ -205,8 +201,4 @@ bool
 decoder_plugin_supports_mime_type(const struct decoder_plugin *plugin,
 				  const char *mime_type);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif

src/MixerControl.hxx

@@ -31,10 +31,6 @@ class Mixer;
 struct mixer_plugin;
 struct config_param;
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 Mixer *
 mixer_new(const struct mixer_plugin *plugin, void *ao,
 	  const config_param &param,
@@ -62,8 +58,4 @@ mixer_get_volume(Mixer *mixer, GError **error_r);
 bool
 mixer_set_volume(Mixer *mixer, unsigned volume, GError **error_r);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif

src/PlaylistFile.hxx

@@ -39,8 +39,6 @@ extern bool playlist_saveAbsolutePaths;
 void
 spl_global_init(void);
 
-#ifdef __cplusplus
-
 /**
  * Determines whether the specified string is a valid name for a
  * stored playlist.
@@ -81,5 +79,3 @@ bool
 spl_rename(const char *utf8from, const char *utf8to, GError **error_r);
 
 #endif
-
-#endif

src/mixer/PulseMixerPlugin.hxx

@@ -26,10 +26,6 @@ struct PulseMixer;
 struct pa_context;
 struct pa_stream;
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 void
 pulse_mixer_on_connect(PulseMixer *pm, struct pa_context *context);
 
@@ -40,8 +36,4 @@ void
 pulse_mixer_on_change(PulseMixer *pm,
 		      struct pa_context *context, struct pa_stream *stream);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif

src/output/PulseOutputPlugin.hxx

@@ -28,10 +28,6 @@ struct pa_cvolume;
 
 extern const struct audio_output_plugin pulse_output_plugin;
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 void
 pulse_output_lock(PulseOutput *po);
 
@@ -48,8 +44,4 @@ bool
 pulse_output_set_volume(PulseOutput *po,
 			const struct pa_cvolume *volume, GError **error_r);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif

src/util/StringUtil.hxx

@@ -22,28 +22,6 @@
 
 #include "gcc.h"
 
-/**
- * Remove the "const" attribute from a string pointer.  This is a
- * dirty hack, don't use it unless you know what you're doing!
- */
-gcc_const
-static inline char *
-deconst_string(const char *p)
-{
-#ifdef __cplusplus
-	return const_cast<char *>(p);
-#else
-	union {
-		const char *in;
-		char *out;
-	} u = {
-		.in = p,
-	};
-
-	return u.out;
-#endif
-}
-
 /**
  * Returns a pointer to the first non-whitespace character in the
  * string, or to the end of the string.
@@ -62,7 +40,7 @@ gcc_pure
 static inline char *
 strchug_fast(char *p)
 {
-	return deconst_string(strchug_fast_c(p));
+	return const_cast<char *>(strchug_fast_c(p));
 }
 
 /**