EnumSetting has a template parameter

src/Dither.cpp

@@ -403,14 +403,14 @@ static const std::initializer_list<EnumValueSymbol> choicesDither{
    { XO("Triangle") },
    { XO("Shaped") },
 };
-static const std::initializer_list<int> intChoicesDither{
+static auto intChoicesDither = {
    DitherType::none,
    DitherType::rectangle,
    DitherType::triangle,
    DitherType::shaped,
 };
 
-EnumSetting Dither::FastSetting{
+EnumSetting< DitherType > Dither::FastSetting{
    wxT("Quality/DitherAlgorithmChoice"),
    choicesDither,
    0, // none
@@ -420,7 +420,7 @@ EnumSetting Dither::FastSetting{
    wxT("Quality/DitherAlgorithm")
 };
 
-EnumSetting Dither::BestSetting{
+EnumSetting< DitherType > Dither::BestSetting{
    wxT("Quality/HQDitherAlgorithmChoice"),
    choicesDither,
    3, // shaped
@@ -432,10 +432,10 @@ EnumSetting Dither::BestSetting{
 
 DitherType Dither::FastDitherChoice()
 {
-   return (DitherType) FastSetting.ReadInt();
+   return (DitherType) FastSetting.ReadEnum();
 }
 
 DitherType Dither::BestDitherChoice()
 {
-   return (DitherType) BestSetting.ReadInt();
+   return (DitherType) BestSetting.ReadEnum();
 }

src/Dither.h

@@ -12,7 +12,7 @@
 
 #include "audacity/Types.h" // for samplePtr
 
-class EnumSetting;
+template< typename Enum > class EnumSetting;
 
 
 /// These ditherers are currently available:
@@ -25,7 +25,7 @@ public:
     static DitherType FastDitherChoice();
     static DitherType BestDitherChoice();
 
-    static EnumSetting FastSetting, BestSetting;
+    static EnumSetting< DitherType > FastSetting, BestSetting;
 
     /// Default constructor
     Dither();

src/Prefs.cpp

@@ -331,7 +331,7 @@ bool ChoiceSetting::Write( const wxString &value )
    return result;
 }
 
-EnumSetting::EnumSetting(
+EnumSettingBase::EnumSettingBase(
    const wxString &key,
    EnumValueSymbols symbols,
    long defaultSymbol,
@@ -358,7 +358,7 @@ void ChoiceSetting::SetDefault( long value )
       wxASSERT( false );
 }
 
-int EnumSetting::ReadInt() const
+int EnumSettingBase::ReadInt() const
 {
    auto index = Find( Read() );
 
@@ -366,7 +366,7 @@ int EnumSetting::ReadInt() const
    return mIntValues[ index ];
 }
 
-int EnumSetting::ReadIntWithDefault( int defaultValue ) const
+int EnumSettingBase::ReadIntWithDefault( int defaultValue ) const
 {
    wxString defaultString;
    auto index0 = FindInt( defaultValue );
@@ -381,7 +381,7 @@ int EnumSetting::ReadIntWithDefault( int defaultValue ) const
    return mIntValues[ index ];
 }
 
-size_t EnumSetting::FindInt( int code ) const
+size_t EnumSettingBase::FindInt( int code ) const
 {
    const auto start = mIntValues.begin();
    return size_t(
@@ -389,7 +389,7 @@ size_t EnumSetting::FindInt( int code ) const
          - start );
 }
 
-void EnumSetting::Migrate( wxString &value )
+void EnumSettingBase::Migrate( wxString &value )
 {
    int intValue = 0;
    if ( !mOldKey.empty() &&
@@ -409,7 +409,7 @@ void EnumSetting::Migrate( wxString &value )
    }
 }
 
-bool EnumSetting::WriteInt( int code ) // you flush gPrefs afterward
+bool EnumSettingBase::WriteInt( int code ) // you flush gPrefs afterward
 {
    auto index = FindInt( code );
    if ( index >= mSymbols.size() )

src/Prefs.h

@@ -171,10 +171,10 @@ protected:
 /// (generally not equal to their table positions),
 /// and optionally an old preference key path that stored integer codes, to be
 /// migrated into one that stores internal string values instead
-class EnumSetting : public ChoiceSetting
+class EnumSettingBase : public ChoiceSetting
 {
 public:
-   EnumSetting(
+   EnumSettingBase(
       const wxString &key,
       EnumValueSymbols symbols,
       long defaultSymbol,
@@ -183,6 +183,8 @@ public:
       const wxString &oldKey
    );
 
+protected:
+
    // Read and write the encoded values
    int ReadInt() const;
 
@@ -193,7 +195,6 @@ public:
 
    bool WriteInt( int code ); // you flush gPrefs afterward
 
-protected:
    size_t FindInt( int code ) const;
    void Migrate( wxString& ) override;
 
@@ -202,6 +203,45 @@ private:
    const wxString mOldKey;
 };
 
+/// Adapts EnumSettingBase to a particular enumeration type
+template< typename Enum >
+class EnumSetting : public EnumSettingBase
+{
+public:
+
+   EnumSetting(
+      const wxString &key,
+      EnumValueSymbols symbols,
+      long defaultSymbol,
+
+      std::initializer_list< Enum > values, // must have same size as symbols
+      const wxString &oldKey
+   )
+      : EnumSettingBase{
+         key, symbols, defaultSymbol,
+         { values.begin(), values.end() },
+         oldKey
+      }
+   {}
+
+   // Wrap ReadInt() and ReadIntWithDefault() and WriteInt()
+   Enum ReadEnum() const
+   { return static_cast<Enum>( ReadInt() ); }
+
+   // new direct use is discouraged but it may be needed in legacy code:
+   // use a default in case the preference is not defined, which may not be
+   // the default-default stored in this object.
+   Enum ReadEnumWithDefault( Enum defaultValue ) const
+   {
+      auto integer = static_cast<int>(defaultValue);
+      return static_cast<Enum>( ReadIntWithDefault( integer ) );
+   }
+
+   bool WriteEnum( Enum value )
+   { return WriteInt( static_cast<int>( value ) ); }
+
+};
+
 // An event emitted by the application when the Preference dialog commits
 // changes
 wxDECLARE_EVENT(EVT_PREFS_UPDATE, wxCommandEvent);

src/Resample.cpp

@@ -63,7 +63,7 @@ static auto intChoicesMethod = {
    0, 1, 2, 3
 };
 
-EnumSetting Resample::FastMethodSetting{
+EnumSetting< int > Resample::FastMethodSetting{
    wxT("/Quality/LibsoxrSampleRateConverterChoice"),
    methodNames,
    1,  // Medium Quality
@@ -73,7 +73,7 @@ EnumSetting Resample::FastMethodSetting{
    wxT("/Quality/LibsoxrSampleRateConverter")
 };
 
-EnumSetting Resample::BestMethodSetting
+EnumSetting< int > Resample::BestMethodSetting
 {
    wxT("/Quality/LibsoxrHQSampleRateConverterChoice"),
    methodNames,
@@ -115,7 +115,7 @@ std::pair<size_t, size_t>
 void Resample::SetMethod(const bool useBestMethod)
 {
    if (useBestMethod)
-      mMethod = BestMethodSetting.ReadInt();
+      mMethod = BestMethodSetting.ReadEnum();
    else
-      mMethod = FastMethodSetting.ReadInt();
+      mMethod = FastMethodSetting.ReadEnum();
 }

src/Resample.h

@@ -16,7 +16,7 @@
 
 #include "SampleFormat.h"
 
-class EnumSetting;
+template< typename Enum > class EnumSetting;
 
 struct soxr;
 extern "C" void soxr_delete(soxr*);
@@ -41,8 +41,8 @@ class Resample final
    Resample(const bool useBestMethod, const double dMinFactor, const double dMaxFactor);
    ~Resample();
 
-   static EnumSetting FastMethodSetting;
+   static EnumSetting< int > FastMethodSetting;
-   static EnumSetting BestMethodSetting;
+   static EnumSetting< int > BestMethodSetting;
 
    /** @brief Main processing function. Resamples from the input buffer to the
     * output buffer.

src/prefs/QualityPrefs.cpp

@@ -32,7 +32,7 @@
 
 //////////
 
-static EnumSetting formatSetting{
+static EnumSetting< sampleFormat > formatSetting{
    wxT("/SamplingRate/DefaultProjectSampleFormatChoice"),
    {
       { wxT("Format16Bit"), XO("16-bit") },
@@ -241,6 +241,6 @@ QualityPrefsFactory = [](wxWindow *parent, wxWindowID winid)
 
 sampleFormat QualityPrefs::SampleFormatChoice()
 {
-   return (sampleFormat)formatSetting.ReadInt();
+   return formatSetting.ReadEnum();
 }
 

src/prefs/TracksPrefs.cpp

@@ -54,14 +54,15 @@ namespace {
 
 
 //////////
-class TracksViewModeEnumSetting : public EnumSetting {
+class TracksViewModeEnumSetting
+   : public EnumSetting< WaveTrackViewConstants::Display > {
 public:
    TracksViewModeEnumSetting(
       const wxString &key,
       EnumValueSymbols symbols,
       long defaultSymbol,
 
-      std::vector<int> intValues,
+      std::initializer_list< WaveTrackViewConstants::Display > intValues,
       const wxString &oldKey
    )
       : EnumSetting{
@@ -120,11 +121,12 @@ static TracksViewModeEnumSetting viewModeSetting{
 
 WaveTrackViewConstants::Display TracksPrefs::ViewModeChoice()
 {
-   return (WaveTrackViewConstants::Display) viewModeSetting.ReadInt();
+   return viewModeSetting.ReadEnum();
 }
 
 //////////
-static EnumSetting sampleDisplaySetting{
+static EnumSetting< WaveTrackViewConstants::SampleDisplay >
+sampleDisplaySetting{
    wxT("/GUI/SampleViewChoice"),
    {
       { wxT("ConnectDots"), XO("Connect dots") },
@@ -142,7 +144,7 @@ static EnumSetting sampleDisplaySetting{
 
 WaveTrackViewConstants::SampleDisplay TracksPrefs::SampleViewChoice()
 {
-   return (WaveTrackViewConstants::SampleDisplay) sampleDisplaySetting.ReadInt();
+   return sampleDisplaySetting.ReadEnum();
 }
 
 //////////
@@ -163,7 +165,7 @@ static const std::initializer_list<EnumValueSymbol> choicesZoom{
    { wxT("FourPixelsPerSample"), XO("4 Pixels per Sample") },
    { wxT("MaxZoom"), XO("Max Zoom") },
 };
-static const std::initializer_list<int> intChoicesZoom{
+static auto enumChoicesZoom = {
    WaveTrackViewConstants::kZoomToFit,
    WaveTrackViewConstants::kZoomToSelection,
    WaveTrackViewConstants::kZoomDefault,
@@ -181,34 +183,34 @@ static const std::initializer_list<int> intChoicesZoom{
    WaveTrackViewConstants::kMaxZoom,
 };
 
-static EnumSetting zoom1Setting{
+static EnumSetting< WaveTrackViewConstants::ZoomPresets > zoom1Setting{
    wxT("/GUI/ZoomPreset1Choice"),
    choicesZoom,
    2, // kZoomDefault
 
    // for migrating old preferences:
-   intChoicesZoom,
+   enumChoicesZoom,
    wxT("/GUI/ZoomPreset1")
 };
 
-static EnumSetting zoom2Setting{
+static EnumSetting< WaveTrackViewConstants::ZoomPresets > zoom2Setting{
    wxT("/GUI/ZoomPreset2Choice"),
    choicesZoom,
    13, // kZoom4To1
 
    // for migrating old preferences:
-   intChoicesZoom,
+   enumChoicesZoom,
    wxT("/GUI/ZoomPreset2")
 };
 
 WaveTrackViewConstants::ZoomPresets TracksPrefs::Zoom1Choice()
 {
-   return (WaveTrackViewConstants::ZoomPresets) zoom1Setting.ReadInt();
+   return zoom1Setting.ReadEnum();
 }
 
 WaveTrackViewConstants::ZoomPresets TracksPrefs::Zoom2Choice()
 {
-   return (WaveTrackViewConstants::ZoomPresets) zoom2Setting.ReadInt();
+   return zoom2Setting.ReadEnum();
 }
 
 //////////