http://d.puremagic.com/issues/show_bug.cgi?id=1310

           Summary: alias opCall vs struct literal
           Product: D
           Version: 1.017
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: lutger.blijdestijn@gmail.com


When a struct has opCall through an alias, it is not recognized if the aliased symbol is a delegate (not as in a member function). Whether this construct is legal or not, the current behaviour is inconsistent. The following compiles without error but does not do what one expects.

This applies to dmd 1.014-dmd 1.018 and probably the 2.x branch too.

struct A
{
    int delegate() foo;
    alias foo opCall; // not seen, see below
}

struct B
{
    int foo() { return 0; }
    alias foo opCall; // ok
}

void main()
{
    A a;
    B b;
    auto resultA = a();
    pragma(msg, typeof(resultA).stringof); // prints 'A', struct initializer
    auto resultB = b();
    pragma(msg, typeof(resultB).stringof); // prints 'int', recognizes opCall
}


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=1310


thomas-dloop@kuehne.cn changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
         OS/Version|Windows                     |All
           Platform|PC                          |All




------- Comment #1 from thomas-dloop@kuehne.cn  2007-07-23 14:55 -------
The same behaviour is caused by:

# struct A {
#     int opCall;
# }

As far as I can see the code behaves as documented - opCall expects a function not a delegate or function pointer - however issuing at least a warning if -w is used would be sensible. Adding delegate/function pointer support for op* member functions might be interesting nevertheless.


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=1310


Denis Shelomovskij <verylonglogin.reg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |verylonglogin.reg@gmail.com


--- Comment #2 from Denis Shelomovskij <verylonglogin.reg@gmail.com> 2012-08-09 13:30:40 MSD ---
By the way, latest dmd v2.060 correctly (as documented) complains:
---
Error: struct A does not overload ()
---

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