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digitalmars.D.bugs - [Issue 6404] New: Cannot check ref-ness of auto ref parameter in template constraint

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6404

           Summary: Cannot check ref-ness of auto ref parameter in
                    template constraint
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: k.hara.pg gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg gmail.com> 2011-07-29 22:20:45 PDT ---
Cannot compile following code:

// receive only rvalue
void rvalue(T)(auto ref T x) if (!__traits(isRef, x)) {}

// receive only lvalue
void lvalue(T)(auto ref T x) if ( __traits(isRef, x)) {}

void main()
{
    int n;

    static assert(!__traits(compiles, rvalue(n)));
    static assert( __traits(compiles, rvalue(0)));

    static assert( __traits(compiles, lvalue(n)));
    static assert(!__traits(compiles, lvalue(0)));
}

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next sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED


--- Comment #1 from Walter Bright <bugzilla digitalmars.com> 2011-07-30
13:08:23 PDT ---
https://github.com/D-Programming-Language/dmd/commit/407cd0fa8bfe7443302bbf460d56a1e1847c5c01

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |


--- Comment #2 from Kenji Hara <k.hara.pg gmail.com> 2011-07-31 02:47:58 PDT ---
Sorry my patch is incomplete, because it does not support auto ref tuple
parameter.

void rvalueVargs(T...)(auto ref T x) if (!__traits(isRef, x[0])) {}
void lvalueVargs(T...)(auto ref T x) if ( __traits(isRef, x[0])) {}
void test6404()
{
    int n;

    static assert(!__traits(compiles, rvalueVargs(n)));
    static assert( __traits(compiles, rvalueVargs(0)));

    static assert( __traits(compiles, lvalueVargs(n)));
    static assert(!__traits(compiles, lvalueVargs(0)));
}

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


--- Comment #3 from Kenji Hara <k.hara.pg gmail.com> 2011-07-31 03:21:54 PDT ---
Retry to fix it.
https://github.com/D-Programming-Language/dmd/pull/285

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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |FIXED


--- Comment #4 from Walter Bright <bugzilla digitalmars.com> 2011-10-02
18:18:53 PDT ---
https://github.com/D-Programming-Language/dmd/commit/91debf464f8b6c49a0d522d10fce285ad1a5f9e7

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prev sibling parent d-bugmail puremagic.com writes:
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dawg dawgfoto.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dawg dawgfoto.de


--- Comment #5 from dawg dawgfoto.de 2012-02-10 06:10:29 PST ---
I think it would be neat to extend this to IsExpressions.
void foo()(auto ref int val) if (is(typeof(val) == ref))

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