0x09 · HackerTrans

3 ปีที่แล้วdiscuss

It's partly an artifact of BCPL where the only type was one representing the machine word. So with a word-sized type you don't get portability in the range of values the type can represent, but can portably know that you won't e.g. take up 2 registers by using it.

You might consider the int_fastN_t types a sort of spiritual successor to this with fewer downsides since they purposefully guarantee a minimum width.

0x09

3 ปีที่แล้วdiscuss

>Can be macro'd at the function definition, but it's ugly.

I wonder if typeof in c23 has changed this at all. Previously there was no sense in defining an anonymous struct as a function's return type. You could do it, but those structs would not be compatible with anything. With typeof maybe that's no longer the case.

e.g. with clang 16 and gcc 13 at least this compiles with no warning and g() returns 3. But I'm not sure if this is intended by the standard or just happens to work.

    struct { int a; int b; } f() {
        return (typeof(f())){1,2};
    }
    int g() {
        typeof(f()) x = f();
        return x.a + x.b;
    }

edit: though I suppose this just pushes the problem onto callers, since every function that does this now has a distinct return type that can only be referenced using typeof(yourfn).

0x09

3 ปีที่แล้วdiscuss

I'm the author of the extension that the vtab and define function in that module were adapted from. It allows you to create something like a parameterized view, but the way it works is fairly simple: a prepared statement is created from the provided SQL on the same db connection as the vtab, and is executed each time the virtual table is queried. Parameters can be supplied as constraints (or using table valued function syntax) and the results of executing the statement are the row values.

Did you have any questions in particular?

0x09

4 ปีที่แล้วdiscuss

Doxygen has the ability to generate these with its CALL_GRAPH/CALLER_GRAPH config, at least from each function individually. It can look quite funny when the depth isn't limited: https://i.imgur.com/3LMV71N.png

comments