• via Digitalmars-d-bugs (31/31) Nov 10 2015 https://issues.dlang.org/show_bug.cgi?id=15313

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=15313

          Issue ID: 15313
           Summary: std.conv.emplace cannot initialize const objects
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody puremagic.com
          Reporter: andrei erdani.com

Consider this code:

struct Node
{
    int payload;
    Node* next;
    uint refs;
}

void main()
{
    import core.stdc.stdlib : malloc;
    void[] buf = malloc(Node.sizeof)[0 .. Node.sizeof];
    import std.conv : emplace;
    const Node* n = emplace!(Node)(buf, 42, null, 10);
}

Essentially the attempt is to create a new const Node object in the specified
buffer. The code should work, but fails to compile with an obscure error
message.

--