config/Data: add getter methods

src/config/Data.cxx

 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2018 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify

src/config/Data.hxx

 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2018 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -32,6 +32,16 @@ struct ConfigData {
 	std::array<ConfigBlock *, std::size_t(ConfigBlockOption::MAX)> blocks;
 
 	void Clear();
+
+	gcc_pure
+	const ConfigParam *GetParam(ConfigOption option) noexcept {
+		return params[size_t(option)];
+	}
+
+	gcc_pure
+	const ConfigBlock *GetBlock(ConfigBlockOption option) noexcept {
+		return blocks[size_t(option)];
+	}
 };
 
 #endif

src/config/Global.cxx

@@ -77,13 +77,13 @@ void config_global_check(void)
 const ConfigParam *
 config_get_param(ConfigOption option) noexcept
 {
-	return config_data.params[unsigned(option)];
+	return config_data.GetParam(option);
 }
 
 const ConfigBlock *
 config_get_block(ConfigBlockOption option) noexcept
 {
-	return config_data.blocks[unsigned(option)];
+	return config_data.GetBlock(option);
 }
 
 const ConfigBlock *