db/simple: make borrowed_song_count "mutable"

Simpler to use than const_cast.

db/simple: make borrowed_song_count "mutable"
ba372197 · Max Kellermann · bde27cce · ba372197 · ba372197
Commit ba372197 authored Jan 19, 2014 by Max Kellermann
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Showing with 3 additions and 3 deletions

SimpleDatabasePlugin.cxx src/db/SimpleDatabasePlugin.cxx +2 -2

SimpleDatabasePlugin.hxx src/db/SimpleDatabasePlugin.hxx +1 -1

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--- a/src/db/SimpleDatabasePlugin.cxx
+++ b/src/db/SimpleDatabasePlugin.cxx
@@ -206,7 +206,7 @@ SimpleDatabase::GetSong(const char *uri, Error &error) const
 			     "No such song: %s", uri);
 #ifndef NDEBUG
 	else
-		++const_cast<unsigned &>(borrowed_song_count);
+		++borrowed_song_count;
 #endif

 	return song;
@@ -219,7 +219,7 @@ SimpleDatabase::ReturnSong(gcc_unused Song *song) const

 #ifndef NDEBUG
 	assert(borrowed_song_count > 0);
-	--const_cast<unsigned &>(borrowed_song_count);
+	--borrowed_song_count;
 #endif
 }


--- a/src/db/SimpleDatabasePlugin.hxx
+++ b/src/db/SimpleDatabasePlugin.hxx
@@ -37,7 +37,7 @@ class SimpleDatabase : public Database {
 	time_t mtime;

 #ifndef NDEBUG
-	unsigned borrowed_song_count;
+	mutable unsigned borrowed_song_count;
 #endif

 	SimpleDatabase()