On Sunday, 11 March 2018 at 23:12:30 UTC, Joe wrote:
I'm getting a compiler error in a qsort() call as follows:

    qsort(recs, num_recs, (Record *).sizeof, compar);

Record is a struct, recs is a fixed array of pointers to Record's and num_recs is a size_t that holds the number of valid records.

compar is this:

int compar(const void *p1, const void *p2)
    import core.stdc.string : strcmp;
    const Record **rp1 = cast(Record **)p1;
    const Record **rp2 = cast(Record **)p2;

    return strcmp((*rp1).name.ptr, (*rp2).name.ptr);

The error is: Error: function testd.compar (const(void*) p1, const(void*) p2) is not callable using argument types ()

I don't quite understand what those parentheses mean: is it implying "no arguments" and if so, where would one provide arguments?


Out of interest: I wonder what's your usecase for using qsort. Or in other words: why you can't use the high-level std.algorithm.sorting.sort?

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