Re: Is it possible to modify shared struct array in a function.

[Jerry via Digitalmars-d-learn]

On Friday, 8 February 2019 at 04:51:08 UTC, Sudhi wrote:
On Friday, 8 February 2019 at 04:30:23 UTC, Arun Chandrasekaran 
wrote:
On Friday, 8 February 2019 at 04:13:39 UTC, Sudhi wrote:
[...]

Works fine for me with DMD64 D Compiler v2.083.1. 
https://run.dlang.io/is/RRM8GU


My example code was wrong. Below is the right one.

struct Company
{
    string name;
    string location;
}

struct Racks
{
    int number;
    int location;
}

struct Metadata
{
    string name;
    Company[] companies;
    Racks[] racks;
}

struct Item
{
    Metadata[] met;
    int count;
}

shared (Item) item;

void main()
{
   updateMetadata();
}

void updateMetadata()
{
   Company company;
   company.name = "Hello";
   company.location = "Bangalore";
   item.met.companies ~= company;
   import std.stdio: writeln;
   writeln(item);
}

https://run.dlang.io/is/iem0PY

You have to cast away shared:

auto loc_item = cast(Item) item;
loc_item.met ~= m;
item = cast(shared) loc_item;

Just to be clear, this is not threadsafe and require a mutex if 
you do this other than as init in main.