Re: 16MB static arrays again...

[Tomer Filiba via Digitalmars-d]

On Wednesday, 24 August 2016 at 08:34:24 UTC, rikki cattermole 
wrote:
You're welcome to fix optlink 
https://github.com/DigitalMars/optlink
Or write a whole new linker.

Of course there is no reason to not change this for -m32mscoff 
and -m64 on Windows at least that I am aware of.

I'm running on linux with gold linker. No such issues. But the 
point is totally different -- if it's a linker issue, let the 
linker fail. Not the compiler.

Anyway, #FML:

struct BigArray(T, size_t N) {
    mixin((){
        enum arraySizeLimit = 16*1024*1024 - 1;
        enum numFullChunks = (T.sizeof * N) / arraySizeLimit;
        enum elemsPerFullChunk = arraySizeLimit / T.sizeof;
        enum elemsPerLastChunk = N - numFullChunks * 
elemsPerFullChunk;
        static assert (elemsPerLastChunk <= elemsPerFullChunk);

        string s = "";
        size_t covered;
        foreach(i; 0 .. numFullChunks) {
            s ~= "T[%s] arr%s;\n".format(elemsPerFullChunk, i);
        }
        s ~= "T[%s] arr%s;\n".format(elemsPerLastChunk, 
numFullChunks);
        return s;
    }());

    enum length = N;

    @property T* ptr() {
        return arr0.ptr;
    }

    @property T[] slice() {
        return arr0.ptr[0 .. N];
    }
    alias slice this;
}