• d-bugmail puremagic.com (62/62) Sep 16 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8669
• d-bugmail puremagic.com (10/10) Sep 16 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8669
• d-bugmail puremagic.com (13/13) Mar 06 2013 http://d.puremagic.com/issues/show_bug.cgi?id=8669
• d-bugmail puremagic.com (10/10) Mar 06 2013 http://d.puremagic.com/issues/show_bug.cgi?id=8669
• d-bugmail puremagic.com (9/9) Mar 11 2013 http://d.puremagic.com/issues/show_bug.cgi?id=8669

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8669

           Summary: TemplateThisParameter should change member function's
                    qualifier
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: k.hara.pg gmail.com



With current implementation, a member function with TemplateThisParameter is
not generated based on each 'this' type.

struct X {
    void foo(this T)() {}
}
void main() {
    X mx;
    mx.foo();
    // T == X, and foo is mutable member function.
    // then we can call it with mutable object.

    immutable(X) ix;
    ix.foo();
    // T == immutable(X), but foo is still *mutable* member function.
    // then we cannot call it with immutable object
}

foo is always instantiated as mutable member function, and always cannot be
called with non-mutable object.

I think this is not convenient in many cases.

====
Enhancement:

If foo is called from immutable object, foo should be instantiated as immutable
member function. Following is detailed explanation of compiler behavior to
realize it.

The declaration of foo is expanded as like follows.

struct X {
    template foo(this T) {
        void foo() {}
    }
}

If T is immutable type, compiler would wrap the template body into
StorageClassDeclaration.

struct X {
    template foo(this T) {   // if T == immutable
      immutable{  // <-- automatically wrapped by the compiler
        void foo() {}  // now foo is immutable member function
      }
    }
    template foo(this T) {   // if T == const
      const{     // <-- automatically wrapped by the compiler
        void foo() {}  // now foo is const member function
      }
    }
    // as well, if T == shared, shared const, inout, and shared inout
}

This would make forwarding operations more convenient, e.g. std.typecons.Proxy.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8669


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull



https://github.com/D-Programming-Language/dmd/pull/1121

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8669




Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/31e57cd1e1606d156f2117c5bef4701005438fba
fix Issue 8669 - TemplateThisParameter should change member function's
qualifier

https://github.com/D-Programming-Language/dmd/commit/391addfda30738089ca220f0d9f025e3842deb1f


[enh] Issue 8669 - TemplateThisParameter should change member function's
qualifier

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8669


Walter Bright <bugzilla digitalmars.com> changed:

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


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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8669




Commit pushed to master at https://github.com/D-Programming-Language/phobos

https://github.com/D-Programming-Language/phobos/commit/0879a5ea45c08463b3a408f7e29e48ec8312be5b
Improve test cases for qualified objects

By fixing issue 8669, they are now working properly.

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