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POVST C++ Nested Classes - Construction and Inclusion
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copied!<p>I need some help in Nested classes. This has sprung from a question I asked <a href="https://stackoverflow.com/questions/4876253/storing-values-in-buffer-within-class-function-method">here</a></p> <p>Essentially I have a class 'myPlugin'. This class is the bulk of my program and includes the 'processReplacing' function.</p> <p>Within processReplacing I need to filter the signal using DSP, currently I am using 11 filters and that has led to 11 filters (and all buffers) being hard coded into processReplacing.</p> <p>However, now I have decided to create a filter class, so I can create a new instance for each filter, call as necessary and improve my code efficiency.</p> <p>So far I have had little success. But now I am using nested classes which, if I can get to work, should mean all else should follow suit.</p> <p>Class definitions in the header are:</p> <pre><code>class myPlugin : public AudioEffectX </code></pre> <p>{</p> <p>public: myPlugin (audioMasterCallback audioMaster); ~myPlugin ();</p> <pre><code>// Processing virtual void processReplacing (float** inputs, float** outputs, VstInt32 sampleFrames); virtual void processDoubleReplacing (double** inputs, double** outputs, VstInt32 sampleFrames); virtual void midiOutNoteOn (int iKey, int iVel); virtual void midiOutNoteOff (int iKey, int iVel); // Program virtual void setProgramName (char* name); virtual void getProgramName (char* name); // Parameters virtual void setParameter (VstInt32 index, float value); virtual float getParameter (VstInt32 index); virtual void getParameterLabel (VstInt32 index, char* label); virtual void getParameterDisplay (VstInt32 index, char* text); virtual void getParameterName (VstInt32 index, char* text); virtual bool getEffectName (char* name); virtual bool getVendorString (char* text); virtual bool getProductString (char* text); virtual VstInt32 getVendorVersion (); virtual VstInt32 canDo (char* text); class aFilterL { friend class myPlugin; public: aFilterL (); ~aFilterL (); float fOut1_l; float filterOut1_l; float Out_1_l; float Out_2_l; float* buffer_Out_1_l; float* buffer_Out_2_l; virtual float aFilterMethodL (float a0, float a1, float a2, float b1, float b2, float inputL, float prevInput1L, float prevInput2L) { Out_1_l = buffer_Out_1_l[0]; Out_2_l = buffer_Out_2_l[0]; filterOut1_l = (a0 * inputL) + (a1 * prevInput1L) + (a2 * prevInput2L) - (b1 * Out_1_l) - (b2 * Out_2_l) + 1.0E-25; fOut1_l = filterOut1_l; buffer_Out_2_l[0] = buffer_Out_1_l[0]; buffer_Out_1_l[0] = fOut1_l; return fOut1_l; } }; class aFilterR { friend class myPlugin; public: aFilterR (); ~aFilterR (); float fOut1_r; float filterOut1_r; float Out_1_r; float Out_2_r; float* buffer_Out_1_r; float* buffer_Out_2_r; virtual float aFilterMethodR (float a0, float a1, float a2, float b1, float b2, float inputR, float prevInput1R, float prevInput2R) { Out_1_r = buffer_Out_1_r[0]; Out_2_r = buffer_Out_2_r[0]; filterOut1_r = (a0 * inputR) + (a1 * prevInput1R) + (a2 * prevInput2R) - (b1 * Out_1_r) - (b2 * Out_2_r) + 1.0E-25; fOut1_r = filterOut1_r; buffer_Out_2_r[0] = buffer_Out_1_r[0]; buffer_Out_1_r[0] = fOut1_r; return fOut1_r; } }; </code></pre> <p>};#endif</p> <p><strong>My issue then is that I can't initialize the filter class correctly. The constructor for 'myPlugin' looks like this (Please bear in mind that this is a very simplified version of the actual constructor)</strong></p> <pre><code>myPlugin::myPlugin (audioMasterCallback audioMaster) </code></pre> <p>: AudioEffectX (audioMaster, 1, 1) // 1 program, 1 parameter only {</p> <pre><code>setNumInputs (2); // stereo in setNumOutputs (2); // stereo out setUniqueID ('Gain'); // identify canProcessReplacing (); // supports replacing output canDoubleReplacing (); // supports double precision processing myPlugin *my_aFilter1L = new aFilterL(); myPlugin *my_aFilter1R = new aFilterR(); </code></pre> <p>}</p> <p>myPlugin::~myPlugin ()</p> <p>{ }</p> <p>When I then try and use my_aFilter1L etc in processReplacing it throws the error:"error C2065: 'my_aFilter1L' : undeclared identifier" <strong>and</strong> "error C2227: left of '->aFilterMethodL' must point to class/struct/union/generic type" </p> <p>I have tried initializing values stored in the filter classes within the myPlugin constructor. I have tried creating the filter constructor i.e. myPlugin::aFilter1L() <strong>OR</strong> aFilter1L::aFilter1L() but these have caused more errors.</p> <p>Not quite sure what I can do. I have worked with classes/functions before, but never nested classes so a bit lost. I've seen lots of threads online and every answer doesn't quite apply; or I have tried the solutions I found and they haven't worked.</p>

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