first re-commit.

pigvalue.h

@@ -0,0 +1,84 @@
+/*****************************************************************************
+
+    source::worx libPiGPio
+    Copyright © 2022 c.holzheuer
+    chris@sourceworx.org
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    Uses:
+
+    pigpiod_if2 by joan2937, pigpio @ abyz.me.uk
+    https://abyz.me.uk/rpi/pigpio
+
+    sigslot  by 2017 Pierre-Antoine Lacaze
+    https://github.com/palacaze/sigslot
+
+***************************************************************************/
+
+
+#ifndef PIGVALUE_H
+#define PIGVALUE_H
+
+
+#include <libpigpio.h>
+
+//class rangeVal
+
+template<class T>
+class LIBPIGPIO_EXPORT pigValue
+{
+
+public:
+
+    sigslot::signal<T> sigValue;
+
+    pigValue() = default;
+    pigValue( T val )
+        : _value( val )
+    {
+
+    }
+    virtual ~pigValue() = default;
+
+    T value()
+    {
+        return _value;
+    }
+
+    void set_value( T value )
+    {
+        _value = value;
+    }
+
+    void change_value( T value )
+    {
+        set_value( value );
+        // emit ...
+    }
+
+    template< typename V >
+    void connect_value( V& listener )
+    {
+        //sigState.connect( [&](bool state) { T::change_state( state ); } );
+        sigValue.connect( &V::change_value, &listener );
+    }
+    /*
+    template< typename O >
+    void add_value_observer( O* target )
+    {
+       signal.connect( &O::on_value_changed, target );
+    }
+    */
+
+
+protected:
+
+    T _value = T();
+
+};
+
+#endif // PIGVALUE_H