The standard Seed7 library "seed7_05.s7i" contains also the following declarations:

 const type: color is new struct
     var integer: red_part   is 0;
     var integer: green_part is 0;
     var integer: blue_part  is 0;
   end struct;

 const func color: (in color: col1) + (in color: col2) is func
   result
     var color: result is color.value;
   begin
     result.red_part   := (col1.red_part   + col2.red_part)   div 2;
     result.green_part := (col1.green_part + col2.green_part) div 2;
     result.blue_part  := (col1.blue_part  + col2.blue_part)  div 2;
   end func;

This declares the type color and the '+' operator to add two colors. The operator symbol could also be something new like 'additiveAdd'. In this case the syntax of 'additiveAdd' would be:

 $ syntax expr: .(). additiveAdd .() is              -> 7;

Memory for color objects is managed automatically without garbage collection. Additionally it is not necessary to call constructors to initialize color objects.