Question

gcc compiles fine on the following code

enum AVMediaType {
    AVMEDIA_TYPE_UNKNOWN = -1,
    AVMEDIA_TYPE_VIDEO,
    AVMEDIA_TYPE_AUDIO,
    AVMEDIA_TYPE_DATA,
    AVMEDIA_TYPE_SUBTITLE,
    AVMEDIA_TYPE_ATTACHMENT,
    AVMEDIA_TYPE_NB
};

static int wanted_stream[AVMEDIA_TYPE_NB]={
    [AVMEDIA_TYPE_AUDIO]=-1,   // Line 234
    [AVMEDIA_TYPE_VIDEO]=-1,
    [AVMEDIA_TYPE_SUBTITLE]=-1,
};

but g++ throws the following error

playerthread.cpp:234: error: expected primary-expression before '[' token

What’s the issue here?

Answer 1

These kind of designated initializers aren’t supported by g++, but they are by gcc. I’m not certain it’s allowed in the C++ standard at all. You can see the same if you bring the code down to a very simple:

int array[10] = { [1] = 5 };

It’s fine in C, not C++.