Re: iterating through members of bitfields

[Nestor via Digitalmars-d-learn]

On Wednesday, 18 January 2017 at 01:15:05 UTC, Ali Çehreli wrote:
Not available but it should be possible to parse the produced 
code:

import std.bitmanip;

string makeBitFieldPrinter(string fieldImpl) {
    return q{
        void printBitFields() const {
            import std.stdio: writeln;
            writeln("Please improve this function by parsing 
fieldImpl. :)");
        }
    };
}

struct S {
    enum myFields = bitfields!(int, "a", 24,
                               byte, "b", 8);

    pragma(msg, "This is the mixed-in bit field 
code\n---------\n",
           myFields, "\n----------");


    mixin (myFields);
    mixin (makeBitFieldPrinter(myFields));
}

void main() {
    const s = S();
    s.printBitFields();
}

Of course that would depend on the implementation of 
bitfields(), which can change without notice.

Ali

Thanks Ali, I was using bitfields according to documentation, but 
now I see that way I can't access the mixin string:

struct S {
    mixin(bitfields!(
        bool, "f1",    1,
        uint, "f2",    4,
        uint, "f3",    3)
    );
}