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digitalmars.D.bugs - [Issue 4053] New: To avoid struct ctor/opCall conflicts

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4053

           Summary: To avoid struct ctor/opCall conflicts
           Product: D
           Version: future
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



This is a D2 program:


struct Foo {
    this(int x=0) {}
    static void opCall(int x, int y) {}
}
void main() {
    auto f2 = Foo(1);    // line 6, OK
    auto f3 = Foo(1, 2); // line 7, Err, opCall not found
    auto f1 = Foo();     // line 8, Err, conflicts with opCall again
}


dmd 2.042 gives:

test.d(7): Error: constructor test.Foo.this (int x = 0) is not callable using
argument types (int,int)
test.d(7): Error: expected 1 arguments, not 2 for non-variadic function type
ref Foo(int x = 0)
test.d(8): Error: function test.Foo.opCall (int x, int y) is not callable using
argument types ()
test.d(8): Error: expected 2 function arguments, not 0
test.d(8): Error: variable test.main.f1 voids have no value
test.d(8): Error: expression opCall() is void and has no value


My suggestion is in structs to disallow opCall() if a this() is present.
This makes the program more tidy, and avoids that conflict with opCall when
Foo() is used with no arguments.

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Apr 02 2010
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4053


Adam D. Ruppe <destructionator gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |destructionator gmail.com



05:18:58 PST ---
An important addition to the suggestion: *static* opCall is the real problem
here. There should be no problem between an instance opCall and a constructor.

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Jan 06 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4053




This (modified) example from Tom shows problems with not static opCall too:


struct Foo {
    int i;
    this(int i) { this.i = i; }
    void opCall(int x, int y) {}
}
void main() {
    Foo foo;
    foo(1, 2);
}

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Mar 08 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
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See also bug 4253

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Mar 08 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
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kennytm gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kennytm gmail.com



Probably the same as issue 1840.

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Apr 28 2011
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4053


Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |k.hara.pg gmail.com
         Resolution|                            |DUPLICATE



*** This issue has been marked as a duplicate of issue 6036 ***

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Jun 21 2011