Constructor method -> instantiations

Based on the posted JPG (see URL), how can a constructor method be used to ensure that no infeasible combinations are instantiated?

http://img52.imageshack.us/img52/463/morphologicalbox.jpg

Any pointers from the C, C++, Java, etc. community are appreciated.

Thanks,
EEH

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You can supply your own constructor and omit the default constructor, as well as provide enumerations for the constant values. To indicate an invalid combination, throw an exception of your choice. I'll just use a char* for right now.

The psuedocode and some code is provided in the code snippet below (geared for Native C++, though I can change it to C# or Managed C++ if you'd like).

Let me know if you need more information

Hope it helps,

Nate

//Declare enumerations for constants value that won't stray (such as an enumeration for the Material. Example:
 
enum HandleMaterial
{
     HM_WOOD,
     HM_FIBER_GLASS,
     HM_STEEL,
     HM_GRAPHITE,
     HM_STEEL_I_BEAM
};
 
// Now, your class. Call it whatever you want, obviously:
class YourClassNameHere
{
public:
     YourClassNameHere(
     NailRemovalFeature nailRem, // Create an enum for this, if appropriate
     int handleLengthInches,
     HandleMaterial material, // Enum created above
     StrikingFeature strikingFeature, // Create an enum for this, if appropriate
     int weightHammerHead)
     {
          switch(nailRem)
          {
               case HM_WOOD:
                    // Make sure the arguments are valid with wood
                    break;
               case HM_FIBER_GLASS:
                    // Make sure the arguments are valid with fiber glass
                    // If it isn't, throw an exception, like below
                    break;
               // Etc.. Do this for all handle materials, or switch this to
               // switch a different dependent component
               default:
                    throw "Invalid combination!";
          }
     }
};

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Constructor method -> instantiations

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Microsoft Visual C++

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