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Question by NightLucididty · Aug 31, 2015 at 09:04 PM · errorfloatlistsint

IComparable error due to float

I am writing a list for my game,

But as I need it to have a string and a float,

So I am using unity's script in for this purpose but I want to use a float instead of unity's use of an int, This is unity's code with my changes in float's but I am still getting the error:

Assets/PlayerMovement.cs(9,14): error CS0738: PlayerMovement' does not implement interface member System.IComparable.CompareTo(PlayerMovement)' and the best implementing candidate PlayerMovement.CompareTo(PlayerMovement)' return type float' does not match interface member return type `int'

 using UnityEngine;
 using System.Collections;
 using System; //This allows the IComparable Interface
 
 //This is the class you will be storing
 //in the different collections. In order to use
 //a collection's Sort() method, this class needs to
 //implement the IComparable interface.
 public class PlayerMovement : IComparable<PlayerMovement>
 {
     public string movementName;
     public float timeOfMovement;
     
     public PlayerMovement(string newMovementName, float newTimeOfMovement)
     {
         movementName = newMovementName;
         timeOfMovement = newTimeOfMovement;
     }
     
     //This method is required by the IComparable
     //interface. 
     public int CompareTo(PlayerMovement other)
     {
         if(other == null)
         {
             return 1;
         }
         
         //Return the difference in power.
         return timeOfMovement - other.timeOfMovement;
     }
 }

How can I remove this error and still use floats in my list, Thanks in advance, NightLucidity

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Answer by Dave-Carlile · Aug 31, 2015 at 09:06 PM

I think you're misunderstanding the purpose of the CompareTo function. It returns < 0 if the current object should sort before the other object, > 0 if it's after, and 0 if they're equal. The data type must be int because that's the definition of the interface, and the data type has no relationship to any other data type in your class. It's simply a way to return the relationship between two objects (-1, 0, +1).

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avatar image NightLucididty · Sep 01, 2015 at 04:44 PM 0
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Yes, I understand that but I was wondering if there was some way, (Another $$anonymous$$ethod maybe), to do this. If not its fine I found another way to do what I needed it is just a little longer than using this Class. Thanks NightLucidity.

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