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I found this interesting idea here https://github.com/bog-dan-ro/shared
<https://github.com/bog-dan-ro/shared>.
We can make it possible once with call/access gating as was proposed by
Bjarne Straustrup long time ago.
Plus we need to distinct const/non-const gating to implement copy-on-write
shared pointers.

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<div dir=3D"ltr">I found this interesting idea here<a href=3D"https://githu=
b.com/bog-dan-ro/shared">=C2=A0https://github.com/bog-dan-ro/shared</a>.<di=
v>We can make it possible once with call/access gating as was proposed by B=
jarne Straustrup long time ago.</div><div>Plus we need to distinct const/no=
n-const gating to implement copy-on-write shared pointers.</div></div>

<p></p>

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