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Currently, it is not possible to use extended for-loops with stuff like
std::sregex_iterator, because there is no .begin()/.end() pair and no
std::begin/std::end pair for std::sregex_iterator -- adding an overload for
std::sregex_iterator to the std-namespace is trivial and doing so will
allow using them in extended for-loops.

I'm already doing this in production code and so far, have found no issues
with it.

My implementation is fairly simple: std::begin(std::sregex_iterator&)
returns the argument and std::end(std::sregex_iterator&) return a default
constructed std::sregex_iterator:


namespace std {
auto end(std::sregex_iterator& ) -> std::sregex_iterator& {
static std::sregex_iterator end_of_sequence_iterator;
return end_of_sequence_iterator;
}

auto begin(std::sregex_iterator& b) -> std::sregex_iterator& {
return b;
}
}

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<div dir=3D"ltr">Currently, it is not possible to use extended for-loops wi=
th stuff like std::sregex_iterator, because there is no <font face=3D"couri=
er new, monospace">.begin()</font>/<font face=3D"courier new, monospace">.e=
nd()</font>=C2=A0pair and no <font face=3D"courier new, monospace">std::beg=
in</font>/<font face=3D"courier new, monospace">std::end</font> pair for <f=
ont face=3D"courier new, monospace">std::sregex_iterator</font> -- adding a=
n overload for <font face=3D"courier new, monospace">std::sregex_iterator</=
font> to the <font face=3D"courier new, monospace">std</font>-namespace is =
trivial and doing so will allow using them in extended for-loops.<div><br><=
/div><div>I&#39;m already doing this in production code and so far, have fo=
und no issues with it.</div><div><br></div><div>My implementation is fairly=
 simple: <font face=3D"courier new, monospace">std::begin(std::sregex_itera=
tor&amp;)</font> returns the argument and <font face=3D"courier new, monosp=
ace">std::end(std::sregex_iterator&amp;)</font> return a default constructe=
d <font face=3D"courier new, monospace">std::sregex_iterator</font>:</div><=
div><font face=3D"courier new, monospace"><br></font></div><div><div><font =
face=3D"courier new, monospace"><br></font></div><div><font face=3D"courier=
 new, monospace">namespace std {</font></div><div><font face=3D"courier new=
, monospace"><span style=3D"white-space:pre"> </span>auto end(std::sregex_i=
terator&amp; ) -&gt; std::sregex_iterator&amp; {</font></div><div><font fac=
e=3D"courier new, monospace"><span style=3D"white-space:pre">   </span>stat=
ic std::sregex_iterator end_of_sequence_iterator;</font></div><div><font fa=
ce=3D"courier new, monospace"><span style=3D"white-space:pre">   </span>ret=
urn end_of_sequence_iterator;</font></div><div><font face=3D"courier new, m=
onospace"><span style=3D"white-space:pre"> </span>}</font></div><div><font =
face=3D"courier new, monospace"><br></font></div><div><font face=3D"courier=
 new, monospace"><span style=3D"white-space:pre"> </span>auto begin(std::sr=
egex_iterator&amp; b) -&gt; std::sregex_iterator&amp; {</font></div><div><f=
ont face=3D"courier new, monospace"><span style=3D"white-space:pre">  </spa=
n>return b;</font></div><div><font face=3D"courier new, monospace"><span st=
yle=3D"white-space:pre"> </span>}</font></div><div><font face=3D"courier ne=
w, monospace">}</font></div></div></div>

<p></p>

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