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Hi,

the idea is simple, it's to add a "auto(this)" generative method qualifier
that would factorizes const, non-const, lvalue and rvalue cv qualifiers.
It would look something like this:

constexpr auto &operator[](size_t index) auto(this)
{
   //might use std::is_const_v<decltype(this)> to fine tool for instance.
   //...
}

And would produce the following methods (if not user-defined):
constexpr auto &operator[](size_t index) const & { ... }
constexpr auto &operator[](size_t index] & { ... }
constexpr auto &operator[](size_t index) && { ... }

As of the reason why, It's to avoid this:

struct C {
  const char & get() const {
    return c;
  }
  char & get() {
    return const_cast<char &>(static_cast<const C &>(*this).get());
  }
  char c;};


This code snippet comes from Scott Meyers' "Effective C++" and is still the
current one of the "best" solutions.
The other being simply to copy paste the method and changing the cv
qualifier.

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<div dir=3D"ltr">Hi,<div><br></div><div>the idea is simple, it&#39;s to add=
 a &quot;auto(this)&quot; generative method qualifier that would factorizes=
 const, non-const, lvalue and rvalue cv qualifiers.</div><div>It would look=
 something like this:</div><div><br></div><div class=3D"prettyprint" style=
=3D"background-color: rgb(250, 250, 250); border-color: rgb(187, 187, 187);=
 border-style: solid; border-width: 1px; word-wrap: break-word;"><code clas=
s=3D"prettyprint"><div class=3D"subprettyprint"><span style=3D"color: #008;=
" class=3D"styled-by-prettify">constexpr</span><span style=3D"color: #000;"=
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"styled-by-prettify">auto</span><span style=3D"color: #000;" class=3D"style=
d-by-prettify"> </span><span style=3D"color: #660;" class=3D"styled-by-pret=
tify">&amp;</span><span style=3D"color: #008;" class=3D"styled-by-prettify"=
>operator</span><span style=3D"color: #660;" class=3D"styled-by-prettify">[=
](</span><span style=3D"color: #000;" class=3D"styled-by-prettify">size_t i=
ndex</span><span style=3D"color: #660;" class=3D"styled-by-prettify">)</spa=
n><span style=3D"color: #000;" class=3D"styled-by-prettify"> </span><span s=
tyle=3D"color: #008;" class=3D"styled-by-prettify">auto</span><span style=
=3D"color: #660;" class=3D"styled-by-prettify">(</span><span style=3D"color=
: #008;" class=3D"styled-by-prettify">this</span><span style=3D"color: #660=
;" class=3D"styled-by-prettify">)</span><span style=3D"color: #000;" class=
=3D"styled-by-prettify"><br></span><span style=3D"color: #660;" class=3D"st=
yled-by-prettify">{</span><span style=3D"color: #000;" class=3D"styled-by-p=
rettify"><br>=C2=A0 =C2=A0</span><span style=3D"color: #800;" class=3D"styl=
ed-by-prettify">//might use std::is_const_v&lt;decltype(this)&gt; to fine t=
ool for instance.</span><span style=3D"color: #000;" class=3D"styled-by-pre=
ttify"><br>=C2=A0 =C2=A0</span><span style=3D"color: #800;" class=3D"styled=
-by-prettify">//...</span><span style=3D"color: #000;" class=3D"styled-by-p=
rettify"><br></span><span style=3D"color: #660;" class=3D"styled-by-prettif=
y">}</span></div></code></div><div><br></div><div>And would produce the fol=
lowing methods (if not user-defined):</div><div class=3D"prettyprint" style=
=3D"background-color: rgb(250, 250, 250); border-color: rgb(187, 187, 187);=
 border-style: solid; border-width: 1px; word-wrap: break-word;"><code clas=
s=3D"prettyprint"><div class=3D"subprettyprint"><span style=3D"color: #008;=
" class=3D"styled-by-prettify">constexpr</span><span style=3D"color: #000;"=
 class=3D"styled-by-prettify"> </span><span style=3D"color: #008;" class=3D=
"styled-by-prettify">auto</span><span style=3D"color: #000;" class=3D"style=
d-by-prettify"> </span><span style=3D"color: #660;" class=3D"styled-by-pret=
tify">&amp;</span><span style=3D"color: #008;" class=3D"styled-by-prettify"=
>operator</span><span style=3D"color: #660;" class=3D"styled-by-prettify">[=
](</span><span style=3D"color: #000;" class=3D"styled-by-prettify">size_t i=
ndex</span><span style=3D"color: #660;" class=3D"styled-by-prettify">)</spa=
n><span style=3D"color: #000;" class=3D"styled-by-prettify"> </span><span s=
tyle=3D"color: #008;" class=3D"styled-by-prettify">const</span><span style=
=3D"color: #000;" class=3D"styled-by-prettify"> </span><span style=3D"color=
: #660;" class=3D"styled-by-prettify">&amp;</span><span style=3D"color: #00=
0;" class=3D"styled-by-prettify"> </span><span style=3D"color: #660;" class=
=3D"styled-by-prettify">{</span><span style=3D"color: #000;" class=3D"style=
d-by-prettify"> </span><span style=3D"color: #660;" class=3D"styled-by-pret=
tify">...</span><span style=3D"color: #000;" class=3D"styled-by-prettify"> =
</span><span style=3D"color: #660;" class=3D"styled-by-prettify">}</span><s=
pan style=3D"color: #000;" class=3D"styled-by-prettify"><br></span><span st=
yle=3D"color: #008;" class=3D"styled-by-prettify">constexpr</span><span sty=
le=3D"color: #000;" class=3D"styled-by-prettify"> </span><span style=3D"col=
or: #008;" class=3D"styled-by-prettify">auto</span><span style=3D"color: #0=
00;" class=3D"styled-by-prettify"> </span><span style=3D"color: #660;" clas=
s=3D"styled-by-prettify">&amp;</span><span style=3D"color: #008;" class=3D"=
styled-by-prettify">operator</span><span style=3D"color: #660;" class=3D"st=
yled-by-prettify">[](</span><span style=3D"color: #000;" class=3D"styled-by=
-prettify">size_t index</span><span style=3D"color: #660;" class=3D"styled-=
by-prettify">]</span><span style=3D"color: #000;" class=3D"styled-by-pretti=
fy"> </span><span style=3D"color: #660;" class=3D"styled-by-prettify">&amp;=
</span><span style=3D"color: #000;" class=3D"styled-by-prettify"> </span><s=
pan style=3D"color: #660;" class=3D"styled-by-prettify">{</span><span style=
=3D"color: #000;" class=3D"styled-by-prettify"> </span><span style=3D"color=
: #660;" class=3D"styled-by-prettify">...</span><span style=3D"color: #000;=
" class=3D"styled-by-prettify"> </span><span style=3D"color: #660;" class=
=3D"styled-by-prettify">}</span><span style=3D"color: #000;" class=3D"style=
d-by-prettify"><br></span><span style=3D"color: #008;" class=3D"styled-by-p=
rettify">constexpr</span><span style=3D"color: #000;" class=3D"styled-by-pr=
ettify"> </span><span style=3D"color: #008;" class=3D"styled-by-prettify">a=
uto</span><span style=3D"color: #000;" class=3D"styled-by-prettify"> </span=
><span style=3D"color: #660;" class=3D"styled-by-prettify">&amp;</span><spa=
n style=3D"color: #008;" class=3D"styled-by-prettify">operator</span><span =
style=3D"color: #660;" class=3D"styled-by-prettify">[](</span><span style=
=3D"color: #000;" class=3D"styled-by-prettify">size_t index</span><span sty=
le=3D"color: #660;" class=3D"styled-by-prettify">)</span><span style=3D"col=
or: #000;" class=3D"styled-by-prettify"> </span><span style=3D"color: #660;=
" class=3D"styled-by-prettify">&amp;&amp;</span><span style=3D"color: #000;=
" class=3D"styled-by-prettify"> </span><span style=3D"color: #660;" class=
=3D"styled-by-prettify">{</span><span style=3D"color: #000;" class=3D"style=
d-by-prettify"> </span><span style=3D"color: #660;" class=3D"styled-by-pret=
tify">...</span><span style=3D"color: #000;" class=3D"styled-by-prettify"> =
</span><span style=3D"color: #660;" class=3D"styled-by-prettify">}</span><s=
pan style=3D"color: #000;" class=3D"styled-by-prettify"><br></span></div></=
code></div><div><br></div><div>As of the reason why, It&#39;s to avoid this=
:</div><div><br></div><div><pre class=3D"lang-cpp prettyprint prettyprinted=
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herit; font-weight: inherit; font-stretch: inherit; font-size: inherit; lin=
e-height: inherit; font-family: inherit; vertical-align: baseline; color: r=
gb(48, 51, 54);">}</span><span class=3D"pln" style=3D"font-style: inherit; =
font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-si=
ze: inherit; line-height: inherit; font-family: inherit; vertical-align: ba=
seline; color: rgb(48, 51, 54);">
  </span><span class=3D"kwd" style=3D"font-style: inherit; font-variant: in=
herit; font-weight: inherit; font-stretch: inherit; font-size: inherit; lin=
e-height: inherit; font-family: inherit; vertical-align: baseline; color: r=
gb(16, 16, 148);">char</span><span class=3D"pln" style=3D"font-style: inher=
it; font-variant: inherit; font-weight: inherit; font-stretch: inherit; fon=
t-size: inherit; line-height: inherit; font-family: inherit; vertical-align=
: baseline; color: rgb(48, 51, 54);"> c</span><span class=3D"pun" style=3D"=
font-style: inherit; font-variant: inherit; font-weight: inherit; font-stre=
tch: inherit; font-size: inherit; line-height: inherit; font-family: inheri=
t; vertical-align: baseline; color: rgb(48, 51, 54);">;</span><span class=
=3D"pln" style=3D"font-style: inherit; font-variant: inherit; font-weight: =
inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; f=
ont-family: inherit; vertical-align: baseline; color: rgb(48, 51, 54);">
</span><span class=3D"pun" style=3D"font-style: inherit; font-variant: inhe=
rit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-=
height: inherit; font-family: inherit; vertical-align: baseline; color: rgb=
(48, 51, 54);">};</span></code></pre></div><div><br></div>This code snippet=
 comes from Scott Meyers&#39; &quot;Effective C++&quot; and is still the cu=
rrent one of the &quot;best&quot; solutions.<br>The other being simply to c=
opy paste the method and changing the cv qualifier.</div>

<p></p>

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