Calling a function from a header to another header

[DodoSerebro]

So I'm doing a compiler, and I'm using writing everything in headerfiles.

at the moment I have lexer.h, token.h and for this case I need reservedWords.h

reservedWords.h is made up of enums showing the needed words

in token.h I have a function called reservedWords reservedLookup(string str) which returns a reservedWord (enum)

now in lexer.h I have a function called Token* getNextToken() in which I need to make use of the function reservedLookup found in token.h

please not that all of them are classes apart from reservedwords as in

class Lexer
{
   public: .....
}

class token
{
    public .....
}

Any idea how I can call that function?

I tried declaring reservedWords reservedLookup (string str) BUT obviously it's directing me as Lexer::reservedLookup and not as Token::reservedLookup

When I tried using Token::reservedLookup it gave m
e
E:\University\compilers\lexer.h|65|error: cannot declare member function 'Token::reservedLookup' within 'Lexer'|

Any help please?

N.B I use namespace std, that's why I didnot write std::string str

thx

[dhayden]

I'm using writing everything in headerfiles.

The problem you've run into is exactly why we have separate header and code files. Declare your classes in a header file, implement them in a code file.