• bitwise (6/6) Aug 16 2017 If I define a non-default constructor for a struct, are the
• kinke (3/5) Aug 16 2017 The struct instance is initialized with T.init before invoking
• bitwise (5/10) Aug 16 2017 Thanks for the quick response.
• bitwise (28/29) Aug 16 2017 I'm asking this because I need to forward args to a container's

bitwise <bitwise.pvt gmail.com> writes:

If I define a non-default constructor for a struct, are the 
fields initialized to T.init by the time it's called? or am I 
responsible for initializing all fields in that constructor?

..or do structs follow the same rules as classes?
https://dlang.org/spec/class.html#field-init

   Thanks

kinke <noone nowhere.com> writes:

On Wednesday, 16 August 2017 at 18:11:05 UTC, bitwise wrote:
 If I define a non-default constructor for a struct, are the 
 fields initialized to T.init by the time it's called?

The struct instance is initialized with T.init before invoking 
the constructor.

bitwise <bitwise.pvt gmail.com> writes:

On Wednesday, 16 August 2017 at 18:17:36 UTC, kinke wrote:
 On Wednesday, 16 August 2017 at 18:11:05 UTC, bitwise wrote:
 If I define a non-default constructor for a struct, are the 
 fields initialized to T.init by the time it's called?

 The struct instance is initialized with T.init before invoking 
 the constructor.

Thanks for the quick response.

In regards to my second question, the "value = T(args);" variant 
seems to work, even with a const T, without calling a postblit - 
so I guess that's what I'll use.

bitwise <bitwise.pvt gmail.com> writes:

On Wednesday, 16 August 2017 at 18:11:05 UTC, bitwise wrote:
 [...]

I'm asking this because I need to forward args to a container's 
node's value.

Something like this:


struct Node(T)
{
     int flags;
     T value; // maybe const

     this(Args...)(int flags, auto ref Args args)
     {
         this.flags = flags;

         // this?
         emplace(&value, args);

         // or this?
         value = T(args);

         // ?
     }
}

struct Container(T)
{
     Node!T[] nodes;

     void add(Args...)(auto ref Args args)
     {
         int flags = 1234;
         auto p = cast(Node!T*)malloc(Node!T.sizeof);
         nodes ~= emplace(p, flags, args);
     }
}