C#•16mo ago

❔ Switch case on Int type

Hey, so I have a class with variable _type and I want to store a variable type in it (long, int, short, ubyte etc etc). Later I want to do a switch on _type something like

switch(_type)
{
  case long:
  case int:
}

switch(_type)
{
  case long:
  case int:
}

How can I do this?

23 Replies

nukleer bomb•16mo ago

_type variable is of type Type?

TheosOP•16mo ago

yea and when I create this class I do something like new Class(typeof(int));

nukleer bomb•16mo ago

You can't switch on typeof() since it's not a constant You have to use good ol' ifs (also, can you use generics instead of typeof in your class?)

TheosOP•16mo ago

how exactly?

sibber•16mo ago

if you had a variable of the type you can do that switch syntax

MODiX•16mo ago

nukleer bomb

REPL Result: Failure

Type _type = null!;
switch(_type)
{
  case typeof(int):
    Console.WriteLine("int");
    break;
  default:
    Console.WriteLine("???");
    break;
}

Type _type = null!;
switch(_type)
{
  case typeof(int):
    Console.WriteLine("int");
    break;
  default:
    Console.WriteLine("???");
    break;
}

Exception: CompilationErrorException

- A constant value is expected

- A constant value is expected

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ero•16mo ago

new Class<int>()

TheosOP•16mo ago

ero•16mo ago

yeah, they were showing that it doesn't work

TheosOP•16mo ago

ah oke

ero•16mo ago

the modix eval has an error itself you can see it

TheosOP•16mo ago

yep, true i'm not exactly familiar with generics how would I then store this type in my class?

ero•16mo ago

you wouldn't you have it as the type parameter there's not need to store it in any way

TheosOP•16mo ago

but how would I do a switch case on it later?

ero•16mo ago

that depends on your use case it'd be good to have more detail

TheosOP•16mo ago

alright so let me explain it in more details

nukleer bomb•16mo ago

https://learn.microsoft.com/dotnet/standard/generics

TheosOP•16mo ago

i am working on a tokenizer i can have tokens like i8, i16 ,i32 and i64 (for signed ints) and u8 u16 u32 u64 (for unsigned ints)

switch(numberType)
                    {
                        case "i64":
                            long _long;
                            if(long.TryParse(value, out _long)) return new NumberAST(value, typeof(long));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        case "i32":
                            int _int;
                            if (int.TryParse(value, out _int)) return new NumberAST(value, typeof(int));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        case "i16":
                            short _short;
                            if (short.TryParse(value, out _short)) return new NumberAST(value, typeof(short));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        case "i8":
                            sbyte _sbyte;
                            if (sbyte.TryParse(value, out _sbyte)) return new NumberAST(value, typeof(sbyte));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        default:
                            WrongNumberTypeException.Log(number);
                            break;
                    }

switch(numberType)
                    {
                        case "i64":
                            long _long;
                            if(long.TryParse(value, out _long)) return new NumberAST(value, typeof(long));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        case "i32":
                            int _int;
                            if (int.TryParse(value, out _int)) return new NumberAST(value, typeof(int));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        case "i16":
                            short _short;
                            if (short.TryParse(value, out _short)) return new NumberAST(value, typeof(short));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        case "i8":
                            sbyte _sbyte;
                            if (sbyte.TryParse(value, out _sbyte)) return new NumberAST(value, typeof(sbyte));
                            else ValueMatchTypeException.Log(value, numberType);
                            break;
                        default:
                            WrongNumberTypeException.Log(number);
                            break;
                    }

public class NumberAST : ASTNode 
    {
        public string Value;
        public System.Type Type;
        public NumberAST(string value, System.Type type)
        {
            Value = value;
            Type = type;
        }
    }

public class NumberAST : ASTNode 
    {
        public string Value;
        public System.Type Type;
        public NumberAST(string value, System.Type type)
        {
            Value = value;
            Type = type;
        }
    }

ero•16mo ago

how do you mean "tokens"?

TheosOP•16mo ago

tokens are strings

ero•16mo ago

where do they come from

TheosOP•16mo ago

i'm working on a simple programming language and they come from my lexer so

variable = 1000i8;

variable = 1000i8;

would return these tokens:

ID ASSIGN i8

ID ASSIGN i8

so, later using my NumberAST class I want to create LLVM consts

LLVMValueRef.CreateConstInt(LLVMTypeRef.Int64, val);

LLVMValueRef.CreateConstInt(LLVMTypeRef.Int64, val);

thats why i need to do switch case to change the LLVMTypeRef

Accord•16mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Switch case on Int type