http://d.puremagic.com/issues/show_bug.cgi?id=4086

           Summary: Standard struct constructor for the heap
           Product: D
           Version: future
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2010-04-12 23:56:41 PDT ---
D allows to initialize a struct on the stack with a default syntax:

struct Node {
    int data;
    Node* next;
}
void main() {
    Node n1 = Node(10); // OK
    Node n2 = Node(10, null); // OK
}


So I propose to introduce that same handy automatic syntax for heap allocation too:

struct Node {
    int data;
    Node* next;
}
void main() {
    Node* n1 = new Node(10); // OK
    Node* n2 = new Node(10, null); // OK
}


This feature doesn't increase the complexity of the language for the programmer, it lowers the complexity because there is one less special case to remember (even if the compiler can become a bit more complex).


To keep things tidy, such default costructor must be absent if any other costructor is defined in the struct:

struct Foo {
    int data;
    Foo* next;
    this(int d, Foo* p) {
        data = d;
        next = p;
    }
}
void main() {
    Foo* f = new Foo(10); // Error, standard constructor is absent
}

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http://d.puremagic.com/issues/show_bug.cgi?id=4086


Andrei Alexandrescu <andrei@metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei@metalanguage.com
         AssignedTo|nobody@puremagic.com        |andrei@metalanguage.com


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