<s>
C++20	B-Language
is	O
a	O
version	O
of	O
the	O
ISO/IEC	O
14882	O
standard	O
for	O
the	O
C++	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
C++20	B-Language
replaced	O
the	O
prior	O
version	O
of	O
the	O
C++	B-Language
standard	O
,	O
called	O
C++17	B-Language
.	O
</s>
<s>
C++20	B-Language
adds	O
more	O
new	O
major	O
features	O
than	O
C++14	B-Language
or	O
C++17	B-Language
.	O
</s>
<s>
Changes	O
that	O
have	O
been	O
accepted	O
into	O
C++20	B-Language
include	O
:	O
</s>
<s>
And	O
explicit	O
can	O
take	O
an	O
expression	O
since	O
C++20	B-Language
.	O
</s>
<s>
Most	O
of	O
the	O
uses	O
of	O
the	O
volatile	B-Operating_System
keyword	O
have	O
been	O
deprecated	O
.	O
</s>
<s>
In	O
addition	O
to	O
keywords	O
,	O
there	O
are	O
identifiers	O
with	O
special	O
meaning	O
,	O
including	O
new	O
import	O
and	O
module	B-Architecture
.	O
</s>
<s>
New	O
attributes	O
in	O
C++20	B-Language
:	O
</s>
<s>
The	O
C-derived	O
headers	O
<ccomplex>, <ciso646>, <cstdalign>, <cstdbool> and <ctgmath>	O
were	O
removed	O
,	O
as	O
they	O
serve	O
no	O
purpose	O
in	O
C++	B-Language
.	O
</s>
<s>
(	O
The	O
corresponding	O
<*.h>	O
headers	O
remain	O
,	O
for	O
compatibility	O
with	O
C	B-Language
.	O
)	O
</s>
<s>
Visual	O
Studio	O
2019	O
supports	O
all	O
C++20	B-Language
features	O
through	O
its	O
/std:c	O
++latest	O
option	O
,	O
as	O
of	O
version	O
16.10.0	O
.	O
</s>
<s>
An	O
option	O
/std:c	O
++20	O
to	O
enable	O
C++20	B-Language
mode	O
is	O
added	O
in	O
version	O
16.11.0	O
.	O
</s>
<s>
Project	O
properties	O
→	O
Configuration	O
properties	O
→	O
C/C	O
++	O
→	O
Language	O
→	O
C++	B-Language
Language	I-Language
Standard	O
.	O
</s>
<s>
Android	O
and	O
iOS	O
)	O
,	O
while	O
it	O
then	O
requires	O
the	O
"	O
Visual	O
C++	B-Language
for	O
Linux	O
Development	O
extension	O
"	O
.	O
</s>
<s>
Clang	B-Application
has	O
partial	O
C++20	B-Language
support	O
that	O
can	O
be	O
enabled	O
with	O
the	O
option	O
-std	O
=	O
c++20	B-Language
(	O
version	O
10	O
and	O
later	O
)	O
or	O
-std	O
=	O
c++2a	B-Language
(	O
version	O
9	O
and	O
earlier	O
)	O
.	O
</s>
<s>
EDG	B-Language
eccp	I-Language
started	O
implementing	O
C++20	B-Language
features	O
in	O
version	O
5.0	O
and	O
as	O
of	O
version	O
6.1	O
supports	O
most	O
C++20	B-Language
core	O
language	O
features	O
.	O
</s>
<s>
GCC	B-Application
added	O
partial	O
,	O
experimental	O
C++20	B-Language
support	O
in	O
2017	O
in	O
version	O
8	O
through	O
the	O
option	O
-std	O
=	O
c++2a	B-Language
.	O
</s>
<s>
Like	O
Clang	B-Application
,	O
GCC	B-Application
replaced	O
this	O
option	O
with	O
-std	O
=	O
c++20	B-Language
in	O
version	O
10	O
.	O
</s>
<s>
It	O
also	O
has	O
an	O
option	O
to	O
enable	O
GNU	O
extensions	O
in	O
addition	O
to	O
the	O
experimental	O
C++20	B-Language
support	O
,	O
-std	O
=	O
gnu++20	O
.	O
</s>
<s>
Changes	O
applied	O
to	O
the	O
C++20	B-Language
working	O
draft	O
in	O
July	O
2017	O
(	O
Toronto	O
)	O
include	O
:	O
</s>
<s>
Changes	O
applied	O
to	O
the	O
C++20	B-Language
working	O
draft	O
in	O
the	O
fall	O
meeting	O
in	O
November	O
2017	O
(	O
Albuquerque	O
)	O
include	O
:	O
</s>
<s>
Changes	O
applied	O
to	O
the	O
C++20	B-Language
working	O
draft	O
in	O
March	O
2018	O
(	O
Jacksonville	O
)	O
include	O
:	O
</s>
<s>
Changes	O
applied	O
to	O
the	O
C++20	B-Language
working	O
draft	O
in	O
the	O
summer	O
meeting	O
in	O
June	O
2018	O
(	O
Rapperswil	O
)	O
include	O
:	O
</s>
<s>
Changes	O
applied	O
to	O
the	O
C++20	B-Language
working	O
draft	O
in	O
the	O
fall	O
meeting	O
in	O
November	O
2018	O
(	O
San	O
Diego	O
)	O
include	O
:	O
</s>
<s>
Changes	O
applied	O
to	O
the	O
C++20	B-Language
working	O
draft	O
in	O
the	O
winter	O
meeting	O
in	O
February	O
2019	O
(	O
Kona	O
)	O
include	O
:	O
</s>
<s>
Changes	O
applied	O
to	O
the	O
C++20	B-Language
working	O
draft	O
in	O
the	O
summer	O
meeting	O
in	O
July	O
2019	O
(	O
Cologne	O
)	O
include	O
:	O
</s>
