[Question] cpp2 support for brace initializer list for a container?

[guybrush77]

Does cpp2 support brace initializer list for a container? For example, something like:

m: std::map<int, int>;

operator=: (out this) = {
    m = ( (1, 2), (3, 4) );
}

[JohelEGP]

No, see #542.
You need to explicitly specify the elements.
In this case, it'd be std::pair.

    m = ( std::pair(1, 2), std::pair(3, 4) );

[guybrush77]

Thanks for the prompt reply. It's interesting... Would be nice to improve initialization, though it looks tricky to me.

[guybrush77]

Looks like I can't initialize in the constructor:

foo: type = {
    m: std::map<int, int>;
    operator=: (out this, bar: int) = { m = ( std::pair(1, 2), std::pair(3, 4) ); }
}

main: () = {
    f := foo(5);
}

I get this error using MSVC:

repro.cpp2(7): error C2679: binary '=': no operator found which takes a right-hand operand of type 'std::pair<int,int>' (or there is no acceptable conversion)

If I remove the bar parameter then it works.

[JohelEGP]

Looks like a bug, as the generated assignment is (https://cpp2.godbolt.org/z/Yc9Go56Ej):

    auto foo::operator=(cpp2::in<int> bar) -> foo& {
                                        m = std::pair(1, 2), std::pair(3, 4);
                                        return *this;
    }

[guybrush77]

I filed the bug here: #679