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Recently I have written a class to be used as the range expression in
range-based for loops.  Buried 4 levels within my new class is a tiny leaf
object with RAII semantics.  I have been happily using that object
unchanged for years.

Now my new range class is causing me to have to add move semantics not only
to that tiny leaf class but also the 3 new classes layered above it.  As
best as I can tell this is triggered by the fact that throughout the
evolution of range-base for the expansion has always included
initialization the hidden range variable via assignment.  If the
range-expression is an invocation of a constructor then is there any reason
that the language could not mandate emplace construction?

/john

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif">Recently I have written a class to be used as the range=
 expression in range-based for loops.=C2=A0 Buried 4 levels within my new c=
lass is a tiny leaf object with RAII semantics.=C2=A0 I have been happily u=
sing that object unchanged for years.</div><div class=3D"gmail_default" sty=
le=3D"font-family:arial,helvetica,sans-serif"><br></div><div class=3D"gmail=
_default" style=3D"font-family:arial,helvetica,sans-serif">Now my new range=
 class is causing me to have to add move semantics not only to that tiny le=
af class but also the 3 new classes layered above it.=C2=A0 As best as I ca=
n tell this is triggered by the fact that throughout the evolution of range=
-base for the expansion has always included initialization the hidden range=
 variable via assignment.=C2=A0 If the range-expression is an invocation of=
 a constructor then is there any reason that the language could not mandate=
 emplace construction?</div><div class=3D"gmail_default" style=3D"font-fami=
ly:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif">/john</div>
</div>

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9VOXteKB7UWKxUrw%40mail.gmail.com?utm_medium=3Demail&utm_source=3Dfooter">h=
ttps://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CAJnXXogM%3DQ_O=
UA2806gwbNtPiQ9f2G8KD49VOXteKB7UWKxUrw%40mail.gmail.com</a>.<br />

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