• Paul (14/40) Jan 27 2021 I'm experiencing a compile error, but for the life of me, I
• Paul Backus (6/19) Jan 27 2021 The braced-initializer syntax only works in declarations, not
• Paul (6/8) Jan 27 2021 Oh, I see, I'm guessing that explains the (sadly unfinished)

Paul <paultjeadriaanse gmail.com> writes:

I'm experiencing a compile error, but for the life of me, I 
cannot figure out what is wrong.

I'll try to keep it short but the code is roughly as follows:
 class Window{
    Screen screen;
    alias screen this;

     this() {
         Screen s = {bottom_f: {[0, 1]}};
         this.screen = s; // Works
         this.screen = {bottom_f: {[0, 1]}}; // Leads to the 
 list of errors below
     }
     ...
 }

 struct Screen{
     Vec!(2, int) bottom_f;
     ...
 }

 alias Vec(uint size, Type) = Mat!(size, 1, Type);

 struct Mat(uint rows, uint columns = rows, Type = float) {
     private enum uint size = rows * columns;
     union{
         Type[columns][rows] mat;
         Type[size] vec;
     }
     static if (columns == 1) alias vec this;
     else alias mat this;
     . . .
 }


List of errors:
1. "Label "bottom_f" is not used."
2. "expected ; instead of }"
3. "found `}` when expecting `;` following statement"
4. "use `{ }` for an empty statement, not `;`"
5. "found `void` when expecting `;` following statement" (later 
at function below constructor)

Why would assigning to a member variable lead to errors when 
using an intermediate variable of the same type does not?
I tried tweaking a lot but I just can't figure it out. Am I doing 
something wrong?

Paul Backus <snarwin gmail.com> writes:

On Thursday, 28 January 2021 at 01:43:13 UTC, Paul wrote:
 I'm experiencing a compile error, but for the life of me, I 
 cannot figure out what is wrong.

 I'll try to keep it short but the code is roughly as follows:
 class Window{
    Screen screen;
    alias screen this;

     this() {
         Screen s = {bottom_f: {[0, 1]}};
         this.screen = s; // Works
         this.screen = {bottom_f: {[0, 1]}}; // Leads to the 
 list of errors below
     }


The braced-initializer syntax only works in declarations, not 
assignments.

Screen s = {bottom_f: {[0, 1]}}; // Ok - this is a declaration
this.screen = {bottom_f: {[0, 1]}}; // No good - this is an 
assignment

Paul <paultjeadriaanse gmail.com> writes:

On Thursday, 28 January 2021 at 02:03:40 UTC, Paul Backus wrote:
 The braced-initializer syntax only works in declarations, not 
 assignments.

Oh, I see, I'm guessing that explains the (sadly unfinished) 
In-place struct initialization
DIP of wilzbach.
(https://github.com/dlang/DIPs/pull/71)

Kind of sad so many DIP's seem to end up stranded :/