• WhatMeWorry` (24/24) Jun 27 import std.container : RedBlackTree;
• H. S. Teoh (6/36) Jun 27 Move the declaration of Location and Node outside of main and it should
• WhatMeWorry (3/3) Jun 27 Thanks, that did the trick. Not sure why having the declarations
• H. S. Teoh (9/12) Jun 27 If you stuck 'static' to the local scope declarations that ought to fix

WhatMeWorry` <kheaser gmail.com> writes:

import std.container : RedBlackTree;

int main()
{

     struct Location {
         int x;
         int y;
     }

     struct Node{
         this(Location loc, uint f) {
             this.loc = loc;
             this.f = f;
         }
         Location loc;
         uint f;
     }

auto priorityQueue = new RedBlackTree!(Node, "a.f < b.f", true); 
// true: allowDuplicates

// 
C:\D\dmd2\windows\bin64\..\..\src\phobos\std\container\rbtree.d(806): Error:
`main` is
// a nested function and cannot be accessed from
// `std.container.rbtree.RedBlackTree!(Node, "a.f < b.f", 
true).RedBlackTree.allocate`

return 0;
}

"H. S. Teoh" <hsteoh qfbox.info> writes:

On Thu, Jun 27, 2024 at 08:56:13PM +0000, WhatMeWorry` via Digitalmars-d-learn
wrote:
 import std.container : RedBlackTree;
 
 int main()
 {
 
     struct Location {
         int x;
         int y;
     }
 
     struct Node{
         this(Location loc, uint f) {
             this.loc = loc;
             this.f = f;
         }
         Location loc;
         uint f;
     }
 
 auto priorityQueue = new RedBlackTree!(Node, "a.f < b.f", true); // true:
 allowDuplicates
 
 // C:\D\dmd2\windows\bin64\..\..\src\phobos\std\container\rbtree.d(806):
 Error: `main` is
 // a nested function and cannot be accessed from
 // `std.container.rbtree.RedBlackTree!(Node, "a.f < b.f",
 true).RedBlackTree.allocate`
 
 return 0;
 }

Move the declaration of Location and Node outside of main and it should
work.


T

-- 
Almost all proofs have bugs, but almost all theorems are true. -- Paul Pedersen

WhatMeWorry <kheaser gmail.com> writes:

Thanks, that did the trick. Not sure why having the declarations 
at global scope (or is it module scope in D) would work versus 
having them at local scope?

"H. S. Teoh" <hsteoh qfbox.info> writes:

On Thu, Jun 27, 2024 at 10:14:06PM +0000, WhatMeWorry via Digitalmars-d-learn
wrote:
 Thanks, that did the trick. Not sure why having the declarations at
 global scope (or is it module scope in D) would work versus having
 them at local scope?

If you stuck 'static' to the local scope declarations that ought to fix
it too.  The main problem is that without 'static', there will be a
hidden context pointer in the struct that points to the main's local
scope. This can't work with RBTree because it cannot obtain a pointer to
this local scope when it needs to create new nodes.


T

-- 
Freedom: (n.) Man's self-given right to be enslaved by his own depravity.