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Hi, everyone.
I'd like to submit a proposal.
My coding style involves many value classes, so I'd like to have implicitly
defined operator== and operator!=.
The reason is simple. For a value class that has very many members, it will
be a annoyance to define operator== and operator!= manually.
For Example:
    struct ValueClass {
        int fooi;
        char fooc;
        std::string foos;
        // And many other members
    };
As you see, this is a value class.
The operator== and operator!= would be like this:
    bool ValueClass::operator == (const ValueClass &other) const {
        return (fooi == other.fooi) && (fooc == other.fooc) && (foos ==
other.foos) /* && (for any non-static members) */;
    }
    bool ValueClass::operator != (const ValueClass &other) const {
        return !(*this == other);
    }
I want these to be implicitly defined.

These would not be implicitly defined if:

   - operator== is explicitly defined, is pure-abstract, or is deleted
   - operator== from any parent class is unaccessible, is pure-abstract, or
   is deleted
   - any member has operator== which is unaccessible, is pure-abstract, or
   is deleted


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<div dir=3D"ltr"><div>Hi, everyone.</div><div>I'd like to submit a proposal=
..</div><div>My coding style involves many value classes, so I'd like to hav=
e implicitly defined operator=3D=3D and operator!=3D.</div><div>The reason =
is simple. For a value class that has very many members, it will be a annoy=
ance to define operator=3D=3D and operator!=3D manually.</div><div>For Exam=
ple:</div><div dir=3D"ltr">&nbsp;&nbsp;&nbsp;&nbsp;struct ValueClass {</div=
><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int fooi;</div><div>&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; char fooc;</div><div>&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; std::string foos;</div><div>&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; // And many other members</div><div>&nbsp;&nbsp;&nbsp=
; };</div><div>As you see, this is a value class.</div><div>The&nbsp;operat=
or=3D=3D and operator!=3D would be like this:</div><div>&nbsp;&nbsp;&nbsp; =
bool ValueClass::operator =3D=3D (const ValueClass &amp;other) const {</div=
><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return (fooi =3D=3D other.=
fooi) &amp;&amp; (fooc =3D=3D other.fooc) &amp;&amp; (foos =3D=3D other.foo=
s) /* &amp;&amp; (for any non-static members) */;</div><div>&nbsp;&nbsp;&nb=
sp; }</div><div>&nbsp;&nbsp;&nbsp; bool ValueClass::operator !=3D (const Va=
lueClass &amp;other) const {</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;return !(*this =3D=3D other);</div><div>&nbsp;&nbsp;&nbsp; }</d=
iv><div>I&nbsp;want these to be implicitly defined.</div><div><br></div><di=
v>These would not be implicitly defined if:</div><ul><li>operator=3D=3D is =
explicitly defined, is pure-abstract, or is deleted</li><li>operator=3D=3D =
from any parent class is unaccessible, is pure-abstract, or is deleted</li>=
<li>any member has operator=3D=3D which is unaccessible, is pure-abstract, =
or is deleted</li></ul><p><br></p></div>

<p></p>

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.

On 26 April 2015 at 02:18, NDos Dannyu <ndospark320@naver.com> wrote:
> Hi, everyone.
> I'd like to submit a proposal.
> My coding style involves many value classes, so I'd like to have implicitly
> defined operator== and operator!=.

See
http://open-std.org/JTC1/SC22/WG21/docs/papers/2015/n4475.pdf
and
http://open-std.org/JTC1/SC22/WG21/docs/papers/2015/n4476.pdf

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.