hullo all. i've encountered a bizzare inconsistency.

the following is the D spec on rectangular arrays:

void main()
{
    import std.stdio: write, writeln, writef, writefln;
    double[6][3] matrix = 0; // Sets all elements to 0.
    writeln(matrix); // [[0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0]]
}

however, when i attempt to place the very same code within a class...

class ExampleClass
{
    double[6][3] matrix = 0; //fails to compile - "Error: cannot implicitly convert expression `0` of type `int` to `double[6][3]`"
}

evidently i'm doing something wrong here, but i can't understand what or why. what's going on? have i misread the spec?

On Friday, 11 June 2021 at 08:30:29 UTC, Moth wrote:

class ExampleClass
{
    double[6][3] matrix = 0; //fails to compile - "Error: cannot implicitly convert expression `0` of type `int` to `double[6][3]`"
}

The example in the spec is in a function body and you've copied
it to a class body, where the writeln() would also be in error.
I find https://dlang.org/spec/grammar.html quite hard to read
but I imagine there's a state/declaration distinction there, despite
the code looking the same.

This works:

class Example {
    double[6][3] matrix;
    this() {
        matrix = 0;
    }
}

On Friday, 11 June 2021 at 08:40:51 UTC, jfondren wrote:

class Example {
    double[6][3] matrix;
    this() {
        matrix = 0;
    }
}

i see.
that's a bummer - i knew the writeln() wouldn't work in a class body, but i assumed that because other initializations work [e.g, int myint = 4; or int[69] funny = 420;], this case would be much the same. ah well.

off topic, your baba is you avatar is very cute.

On Friday, 11 June 2021 at 08:30:29 UTC, Moth wrote:

It's a bug:
Issue 19178 - Static initialization of 2d static arrays in structs produces garbage or doesn't compile sometimes