http://d.puremagic.com/issues/show_bug.cgi?id=3534

           Summary: const data can be modified by passing through ref
                    function parameter
           Product: D
           Version: 2.036
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: smjg@iname.com
            Blocks: 2573


--- Comment #0 from Stewart Gordon <smjg@iname.com> 2009-11-20 10:58:34 PST ---
Based on a newsgroup post by Tomek Sowiñski.  Both these testcases compile without error:

----------
import std.stdio;

const int a;

void foo(ref int i) {
    i = 4;
}

void foo() {
    foo(a);
}

void main() {
    writefln("%d", a);
    foo();
    writefln("%d", a);
}
----------
The bug disappears if a is explicitly initialised.

----------
import std.stdio;

const int value;

void changeConst() {
    doChange(value);
}

void doChange(ref int var) {
    var = 42;
}

void main() {
    writefln("%d", value);
    changeConst();
    writefln("%d", value);
}
----------
The bug disappears if a is explicitly initialised.

----------
import std.stdio;

class Class {
    int value;

    void changeConst() const {
        doChange(value);
    }

    void doChange(ref int var) const {
        var = 42;
    }
}

void main() {
    Class obj = new Class;
    writefln("%d", obj.value);
    obj.changeConst();
    writefln("%d", obj.value);
}

----------
The bug also bits if doChange is made static or global and the const attribute removed.  If only the const attribute is removed, the error is correctly diagnosed (though this may be partly due to another bug).

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=3534


Stewart Gordon <smjg@iname.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dsimcha@yahoo.com


--- Comment #1 from Stewart Gordon <smjg@iname.com> 2010-09-17 05:17:43 PDT ---
*** Issue 4877 has been marked as a duplicate of this issue. ***

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=3534


yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |yebblies@gmail.com
         Resolution|                            |DUPLICATE


--- Comment #2 from yebblies <yebblies@gmail.com> 2011-01-26 18:27:29 PST ---
*** This issue has been marked as a duplicate of issue 5493 ***

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------