util/Error: new error passing library

Replaces GLib's GError.

src/util/Tokenizer.hxx

@@ -20,7 +20,7 @@
 #ifndef MPD_TOKENIZER_HXX
 #define MPD_TOKENIZER_HXX
 
-#include "gerror.h"
+class Error;
 
 class Tokenizer {
 	char *input;
@@ -50,23 +50,23 @@ public:
 	/**
 	 * Reads the next word.
 	 *
-	 * @param error_r if this function returns nullptr and
-	 * **input_p!=0, it optionally provides a GError object in
+	 * @param error if this function returns nullptr and
+	 * **input_p!=0, it provides an #Error object in
 	 * this argument
 	 * @return a pointer to the null-terminated word, or nullptr
 	 * on error or end of line
 	 */
-	char *NextWord(GError **error_r);
+	char *NextWord(Error &error);
 
 	/**
 	 * Reads the next unquoted word from the input string.
 	 *
 	 * @param error_r if this function returns nullptr and **input_p!=0, it
-	 * optionally provides a GError object in this argument
+	 * provides an #Error object in this argument
 	 * @return a pointer to the null-terminated word, or nullptr
 	 * on error or end of line
 	 */
-	char *NextUnquoted(GError **error_r);
+	char *NextUnquoted(Error &error);
 
 	/**
 	 * Reads the next quoted string from the input string.  A backslash
@@ -76,11 +76,11 @@ public:
 	 * @param input_p the input string; this function returns a pointer to
 	 * the first non-whitespace character of the following token
 	 * @param error_r if this function returns nullptr and **input_p!=0, it
-	 * optionally provides a GError object in this argument
+	 * provides an #Error object in this argument
 	 * @return a pointer to the null-terminated string, or nullptr on error
 	 * or end of line
 	 */
-	char *NextString(GError **error_r);
+	char *NextString(Error &error);
 
 	/**
 	 * Reads the next unquoted word or quoted string from the
@@ -88,12 +88,12 @@ public:
 	 * NextString().
 	 *
 	 * @param error_r if this function returns nullptr and
-	 * **input_p!=0, it optionally provides a GError object in
+	 * **input_p!=0, it provides an #Error object in
 	 * this argument
 	 * @return a pointer to the null-terminated string, or nullptr
 	 * on error or end of line
 	 */
-	char *NextParam(GError **error_r);
+	char *NextParam(Error &error);
 };
 
 #endif