[WIP] initial attempt to set up eit macro translation

[Krastanov]

No description provided.

[Krastanov]

see also https://github.com/igraph/igraph/blob/dafef9909d30e0d90e4654ce8052c99fc359b4d7/include/igraph_iterators.h#L359

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 5.29%. Comparing base (50dc68e) to head (769c417).

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@@            Coverage Diff            @@
##           master     #28      +/-   ##
=========================================
- Coverage    6.47%   5.29%   -1.19%     
=========================================
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  Lines        4342    4310      -32     
=========================================
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[subbarayudu8660]

_ No description provided. _

struct igraph_eit_t
type::igraph_eit_type_t
pos::igraph_int_t
start::igraph_int_t
_end::igraph_int_t
vec::Ptr{igraph_vector_int_t}
end

this is immutable right
so i dont think macros can work on it

[Krastanov]

You can use backtics ``` to format your code in comments to make it easier to understand.

I am not sure what you mean by "macros can not work on it". Julia and C macros just transform syntax, nothing more. So if you have symbol in your code corresponding to something, macros can be applied to that symbol to modify it into a different expression (before the compiler touches these expressions).

Maybe you are referring that Julia immutable objects are stack allocated so you do not really have a pointer that you can provide to a C function that is meant to act on them. That is true, and it might indeed cause you trouble. But the C macros we were discussing had to be translated manually to julia functions anyway, so that should not be a problem. The julia code can do whatever it wants to Julia structures, mutable or not.

If you have questions, could you provide a bigger, more complete snippet of code describing what you have tried.

[subbarayudu8660]

    quote
        $eit[].pos >= $eit[].end
    end
end

macro IGRAPH_EIT_NEXT(eit)
    quote
        $eit[].pos += 1
    end
end

macro IGRAPH_EIT_GET(eit)
    quote
        if $eit[].type == LibIGraph.IGRAPH_EIT_RANGE
            $eit[].pos
        else
            unsafe_load($eit[].vec.stor_begin, $eit[].pos + 1)
        end
    end
end```
this is what ive tried