readByte

[RedDevil]

I am back looking at Clay again and I am having trouble getting readByte() to work.  The following cone snippet works:

var f1 = File("mbi-file-clay",READ);

var b = Byte();

read(f1,@b,1);

but how do I can the 'readByte()' function instead of the low-level 'read' one?  I don't understand the 'Maybe' and 'nothing' constructs so that may be what I am missing.  Any help would be appreciated.  RD

[Stepan Koltsov]

Something like this should work:

===
    var f = File("/etc/passwd", READ);
    while (true) {
        var b = readByte(f);
        if (nothing?(b))
            break;
        writeByte(stdout, just(b));
    }
===

Maybe is a regular type defined in core.maybe module. See https://github.com/jckarter/clay/blob/master/lib-clay/core/maybe/maybe.clay .

--
Stepa

[RedDevil]

Thanks Stepa,

Thanks for clarifying.  What does 'just(b)' do over using only 'b' in the writeByte call.

Also I am having trouble with 2D Arrays - I need to set up a 2D Byte Array and then read the values from a file - should I make another post?