Thread: How do you define operators for custom types?

I tried googling on how to do this but I couldn't find any tutorials or instructions on how to define an operator for a custom type. I'm not sure if it can be done or not, but I've defined operators before in scala and haskell, operators as in "+" and "==". If anyone can point me to instructions on how to do this with C I would appreciate it.

This is my custom typedef:

Code:

typedef enum token_types{                 
    BEGIN, END, READ, WRITE, ID,
    INTLITERAL, LPAREN, RPAREN,
    SEMICOLON, COMMA, ASSIGNOP,
    PLUSOP, MINUSOP, SCANEOF
} token;

I need to define a comparison operator for these tokens. I'm using this to create a small compiler.

Enums are integral constants. You can do what you are talking with an interface and implementation.

You essentially define a data type, and create functions with the operations you want based on that type. You can separate the implementation from the interface so you can easily make changes without affecting the client's code.

http://forge.huihoo.com/attachments/...e-software.pdf

Thanks for the help, but apparently this isn't necessary. I just compared two of those types with the enums, and it seems I don't need to go around defining operators. I'm really new at C, this is like first time I've used it.