diff --git a/examples/cpp/decode/file/main.cpp b/examples/cpp/decode/file/main.cpp
index 64f40386..72a938b8 100644
--- a/examples/cpp/decode/file/main.cpp
+++ b/examples/cpp/decode/file/main.cpp
@@ -72,6 +72,9 @@ protected:
 	virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
 	virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata);
 	virtual void error_callback(::FLAC__StreamDecoderErrorStatus status);
+private:
+	OurDecoder(const OurDecoder&);
+	OurDecoder&operator=(const OurDecoder&);
 };
 
 int main(int argc, char *argv[])
diff --git a/include/FLAC++/metadata.h b/include/FLAC++/metadata.h
index d0c5c772..afa157e5 100644
--- a/include/FLAC++/metadata.h
+++ b/include/FLAC++/metadata.h
@@ -1090,6 +1090,10 @@ namespace FLAC {
 		protected:
 			::FLAC__Metadata_SimpleIterator *iterator_;
 			void clear();
+
+		private: // Do not use.
+			SimpleIterator(const SimpleIterator&);
+			SimpleIterator&operator=(const SimpleIterator&);
 		};
 
 		/* \} */
@@ -1174,6 +1178,10 @@ namespace FLAC {
 		protected:
 			::FLAC__Metadata_Chain *chain_;
 			virtual void clear();
+
+		private: // Do not use.
+			Chain(const Chain&);
+			Chain&operator=(const Chain&);
 		};
 
 		/** This class is a wrapper around the FLAC__metadata_iterator
@@ -1204,6 +1212,10 @@ namespace FLAC {
 		protected:
 			::FLAC__Metadata_Iterator *iterator_;
 			virtual void clear();
+
+		private: // Do not use.
+			Iterator(const Iterator&);
+			Iterator&operator=(const Iterator&);
 		};
 
 		/* \} */
diff --git a/src/libFLAC++/metadata.cpp b/src/libFLAC++/metadata.cpp
index d6fff067..7dbfc310 100644
--- a/src/libFLAC++/metadata.cpp
+++ b/src/libFLAC++/metadata.cpp
@@ -523,36 +523,72 @@ namespace FLAC {
 		// VorbisComment::Entry
 		//
 
-		VorbisComment::Entry::Entry()
+		VorbisComment::Entry::Entry() :
+			is_valid_(true),
+			entry_(),
+			field_name_(0),
+			field_name_length_(0),
+			field_value_(0),
+			field_value_length_(0)
 		{
 			zero();
 		}
 
-		VorbisComment::Entry::Entry(const char *field, unsigned field_length)
+		VorbisComment::Entry::Entry(const char *field, unsigned field_length) :
+			is_valid_(true),
+			entry_(),
+			field_name_(0),
+			field_name_length_(0),
+			field_value_(0),
+			field_value_length_(0)
 		{
 			zero();
 			construct(field, field_length);
 		}
 
-		VorbisComment::Entry::Entry(const char *field)
+		VorbisComment::Entry::Entry(const char *field) :
+			is_valid_(true),
+			entry_(),
+			field_name_(0),
+			field_name_length_(0),
+			field_value_(0),
+			field_value_length_(0)
 		{
 			zero();
 			construct(field);
 		}
 
-		VorbisComment::Entry::Entry(const char *field_name, const char *field_value, unsigned field_value_length)
+		VorbisComment::Entry::Entry(const char *field_name, const char *field_value, unsigned field_value_length) :
+			is_valid_(true),
+			entry_(),
+			field_name_(0),
+			field_name_length_(0),
+			field_value_(0),
+			field_value_length_(0)
 		{
 			zero();
 			construct(field_name, field_value, field_value_length);
 		}
 
-		VorbisComment::Entry::Entry(const char *field_name, const char *field_value)
+		VorbisComment::Entry::Entry(const char *field_name, const char *field_value) :
+			is_valid_(true),
+			entry_(),
+			field_name_(0),
+			field_name_length_(0),
+			field_value_(0),
+			field_value_length_(0)
 		{
 			zero();
 			construct(field_name, field_value);
 		}
 
-		VorbisComment::Entry::Entry(const Entry &entry)
+		VorbisComment::Entry::Entry(const Entry &entry) :
+			is_valid_(true),
+			entry_(),
+			field_name_(0),
+			field_name_length_(0),
+			field_value_(0),
+			field_value_length_(0)
 		{
 			FLAC__ASSERT(entry.is_valid());
 			zero();
diff --git a/src/test_libFLAC++/decoders.cpp b/src/test_libFLAC++/decoders.cpp
index 23a67782..77fe7e92 100644
--- a/src/test_libFLAC++/decoders.cpp
+++ b/src/test_libFLAC++/decoders.cpp
@@ -125,6 +125,7 @@ public:
 	bool error_occurred_;
 
 	DecoderCommon(Layer layer): layer_(layer), current_metadata_number_(0), ignore_errors_(false), error_occurred_(false) { }
+	virtual ~DecoderCommon(void) { }
 	::FLAC__StreamDecoderWriteStatus common_write_callback_(const ::FLAC__Frame *frame);
 	void common_metadata_callback_(const ::FLAC__StreamMetadata *metadata);
 	void common_error_callback_(::FLAC__StreamDecoderErrorStatus status);
@@ -193,6 +194,9 @@ public:
 	void error_callback(::FLAC__StreamDecoderErrorStatus status);
 
 	bool test_respond(bool is_ogg);
+private:
+	StreamDecoder(const StreamDecoder&);
+	StreamDecoder&operator=(const StreamDecoder&);
 };
 
 ::FLAC__StreamDecoderReadStatus StreamDecoder::read_callback(FLAC__byte buffer[], size_t *bytes)
diff --git a/src/test_libFLAC++/encoders.cpp b/src/test_libFLAC++/encoders.cpp
index 98b46856..e484c94a 100644
--- a/src/test_libFLAC++/encoders.cpp
+++ b/src/test_libFLAC++/encoders.cpp
@@ -106,6 +106,9 @@ public:
 	::FLAC__StreamEncoderSeekStatus seek_callback(FLAC__uint64 absolute_byte_offset);
 	::FLAC__StreamEncoderTellStatus tell_callback(FLAC__uint64 *absolute_byte_offset);
 	void metadata_callback(const ::FLAC__StreamMetadata *metadata);
+private:
+	StreamEncoder(const StreamEncoder&);
+	StreamEncoder&operator=(const StreamEncoder&);
 };
 
 ::FLAC__StreamEncoderReadStatus StreamEncoder::read_callback(FLAC__byte buffer[], size_t *bytes)