DecoderList: reimplement _for_each() with function object

src/CommandLine.cxx

@@ -75,16 +75,16 @@ static void version(void)
 	     "\n"
 	     "Decoders plugins:");
 
-	decoder_plugins_for_each(plugin) {
-		printf(" [%s]", plugin->name);
+	decoder_plugins_for_each([](const DecoderPlugin &plugin){
+			printf(" [%s]", plugin.name);
 
-		const char *const*suffixes = plugin->suffixes;
-		if (suffixes != nullptr)
-			for (; *suffixes != nullptr; ++suffixes)
-				printf(" %s", *suffixes);
+			const char *const*suffixes = plugin.suffixes;
+			if (suffixes != nullptr)
+				for (; *suffixes != nullptr; ++suffixes)
+					printf(" %s", *suffixes);
 
-		puts("");
-	}
+			puts("");
+		});
 
 	puts("\n"
 	     "Output plugins:");

src/DecoderList.cxx

@@ -180,9 +180,9 @@ decoder_plugin_from_mime_type(const char *mimeType, unsigned int next)
 const struct DecoderPlugin *
 decoder_plugin_from_name(const char *name)
 {
-	decoder_plugins_for_each_enabled(plugin)
-		if (strcmp(plugin->name, name) == 0)
-			return plugin;
+	decoder_plugins_find([=](const DecoderPlugin &plugin){
+			return strcmp(plugin.name, name) == 0;
+		});
 
 	return nullptr;
 }
@@ -233,6 +233,7 @@ void decoder_plugin_init_all(void)
 
 void decoder_plugin_deinit_all(void)
 {
-	decoder_plugins_for_each_enabled(plugin)
-		plugin->Finish();
+	decoder_plugins_for_each_enabled([=](const DecoderPlugin &plugin){
+			plugin.Finish();
+		});
 }

src/DecoderList.hxx

@@ -25,16 +25,6 @@ struct DecoderPlugin;
 extern const struct DecoderPlugin *const decoder_plugins[];
 extern bool decoder_plugins_enabled[];
 
-#define decoder_plugins_for_each(plugin) \
-	for (const struct DecoderPlugin *plugin, \
-		*const*decoder_plugin_iterator = &decoder_plugins[0]; \
-		(plugin = *decoder_plugin_iterator) != nullptr; \
-		++decoder_plugin_iterator)
-
-#define decoder_plugins_for_each_enabled(plugin) \
-	decoder_plugins_for_each(plugin) \
-		if (decoder_plugins_enabled[decoder_plugin_iterator - decoder_plugins])
-
 /* interface for using plugins */
 
 /**
@@ -60,4 +50,32 @@ void decoder_plugin_init_all(void);
 /* this is where we "unload" all the "plugins" */
 void decoder_plugin_deinit_all(void);
 
+template<typename F>
+static inline const DecoderPlugin *
+decoder_plugins_find(F f)
+{
+	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i)
+		if (decoder_plugins_enabled[i] && f(*decoder_plugins[i]))
+			return decoder_plugins[i];
+
+	return nullptr;
+}
+
+template<typename F>
+static inline void
+decoder_plugins_for_each(F f)
+{
+	for (auto i = decoder_plugins; *i != nullptr; ++i)
+		f(**i);
+}
+
+template<typename F>
+static inline void
+decoder_plugins_for_each_enabled(F f)
+{
+	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i)
+		if (decoder_plugins_enabled[i])
+			f(*decoder_plugins[i]);
+}
+
 #endif

src/DecoderPrint.cxx

@@ -23,31 +23,33 @@
 #include "DecoderPlugin.hxx"
 #include "Client.hxx"
 
+#include <functional>
+
 #include <assert.h>
 
 static void
 decoder_plugin_print(Client &client,
-		     const struct DecoderPlugin *plugin)
+		     const DecoderPlugin &plugin)
 {
 	const char *const*p;
 
-	assert(plugin != nullptr);
-	assert(plugin->name != nullptr);
+	assert(plugin.name != nullptr);
 
-	client_printf(client, "plugin: %s\n", plugin->name);
+	client_printf(client, "plugin: %s\n", plugin.name);
 
-	if (plugin->suffixes != nullptr)
-		for (p = plugin->suffixes; *p != nullptr; ++p)
+	if (plugin.suffixes != nullptr)
+		for (p = plugin.suffixes; *p != nullptr; ++p)
 			client_printf(client, "suffix: %s\n", *p);
 
-	if (plugin->mime_types != nullptr)
-		for (p = plugin->mime_types; *p != nullptr; ++p)
+	if (plugin.mime_types != nullptr)
+		for (p = plugin.mime_types; *p != nullptr; ++p)
 			client_printf(client, "mime_type: %s\n", *p);
 }
 
 void
 decoder_list_print(Client &client)
 {
-	decoder_plugins_for_each_enabled(plugin)
-		decoder_plugin_print(client, plugin);
+	using namespace std::placeholders;
+	const auto f = std::bind(decoder_plugin_print, std::ref(client), _1);
+	decoder_plugins_for_each_enabled(f);
 }