I was hoping for

1) constexpr
2) auto
3) const
3) noexcept
4) template

But I guess we can work on that ;)

Regarding the search functionality: This is an extremely useful tool,
especially for mentoring purposes where we can show real world examples of
certain keywords. It's astounding to me that goto still has such prevalence.

I do have a feature request, but it's one that you're not going to like. If
the source files have a creation date, can this be used for identifying
trends - such as an increasing use of constexpr over time, a decreasing use
of *insert token that any suggestion of being outdated will offend at least
one portion of the community*. This is probably a little optimistic but
it'd make for interesting reading.

On Mon, 30 Sep 2019, 21:43 Andrew Tomazos via Std-Proposals, <
std-proposals_at_[hidden]> wrote:

> I'm releasing a second artifact from ACTCD19 today I call "PERFILE" which
> estimates the per-source-file prevalence of C/C++ tokens.
>
> For each of the 47,705,063 unique token spellings, we count how many of
> the 2,489,599 source files contain at least one occurence of the token, we
> then divide by the total number of source files to determine the percentage
> of source files that contain at least one occurence of the token.
>
> For example, 41% of C/C++ source files contain one or more occurences of
> the keyword `else`. Therefore, it follows that 59% of C/C++ source files
> do not contain the keyword `else`.
>
> Tokens with greater than 0.01% (occur in more than 1 in every 10,000
> source files) prevelance are listed in ACTCD19-PERFILE.txt which is
> attached and also available via the following link:
>
>
> https://raw.githubusercontent.com/tomazos/actcd19/master/ACTCD19-PERFILE.txt
>
> For a random samples of occurences of a given token you can use
> codesearch.isocpp.org.
>
> The TOP 300 are pasted below. (TOKLEN is just the byte length of the token
> for machine-reading)
>
> PERCENT TOKLEN TOKEN
> 97.1256 1 #
> 95.8277 1 ;
> 95.4258 1 (
> 95.4252 1 )
> 90.9156 1 }
> 90.9142 1 {
> 90.535 7 include
> 87.8798 1 ,
> 80.5935 1 *
> 72.3236 4 void
> 72.0929 1 =
> 65.7425 5 const
> 64.5512 1 &
> 62.1809 1 0
> 61.3398 6 return
> 60.7381 3 int
> 58.7883 1 :
> 58.3704 5 endif
> 57.1048 2 if
> 55.8634 6 define
> 55.3522 1 <
> 52.0347 1 1
> 48.8295 1 >
> 46.1672 1 .
> 45.3091 1 [
> 45.3088 1 ]
> 43.2325 2 ->
> 43.1835 2 ==
> 43.0489 2 ::
> 41.2506 6 ifndef
> 40.6642 4 else
> 40.2556 4 char
> 37.8444 1 !
> 37.62 1 -
> 36.7728 6 static
> 35.4269 2 !=
> 34.1355 1 +
> 33.7223 1 2
> 33.4819 4 bool
> 33.4318 2 ++
> 32.695 2 &&
> 32.1592 6 struct
> 31.436 3 for
> 29.8759 9 namespace
> 29.2479 1 ~
> 28.0267 5 class
> 26.7104 2 ||
> 26.5191 1 i
> 26.1835 4 NULL
> 25.5951 6 public
> 23.7209 1 3
> 23.0291 8 unsigned
> 21.6406 3 std
> 21.5988 1 4
> 21.2915 5 false
> 20.7938 4 true
> 20.7838 5 break
> 20.6971 1 ?
> 20.4055 6 sizeof
> 20.2566 5 ifdef
> 20.0997 5 while
> 18.9025 2 >=
> 18.8148 2 +=
> 18.6324 2 <<
> 18.3964 4 size
> 18.3067 7 typedef
> 17.2047 1 /
> 17.0467 7 private
> 16.9848 4 name
> 16.0492 6 size_t
> 15.9981 6 switch
> 15.9651 4 case
> 15.7386 4 data
> 15.2661 1 8
> 14.9547 1 5
> 14.812 2 <=
> 14.411 4 type
> 14.3009 1 |
> 14.2562 7 default
> 13.5917 3 new
> 13.423 1 x
> 13.1595 4 this
> 12.8055 6 string
> 12.638 6 double
> 12.6224 5 value
> 12.4951 2 10
> 12.1794 4 enum
> 12.0366 1 6
> 11.4818 4 long
> 11.2566 6 extern
> 11.0233 2 16
> 10.9757 2 --
> 10.9749 1 p
> 10.6333 7 virtual
> 10.4838 5 using
> 10.4255 1 s
> 10.1317 1 n
> 9.93525 1 7
> 9.76454 2 >>
> 9.61581 7 defined
> 9.60613 3 end
> 9.5623 2 ""
> 9.48382 8 continue
> 9.28961 1 c
> 9.23719 9 <stdio.h>
> 9.15662 3 len
> 9.04013 10 <string.h>
> 8.66356 9 protected
> 8.65312 1 a
> 8.6105 10 <stdlib.h>
> 8.51165 1 b
> 8.46984 1 y
> 8.41521 6 vector
> 8.33202 6 parent
> 8.23494 6 inline
> 8.03579 4 main
> 8.00691 5 flags
> 7.9359 2 -=
> 7.87729 5 count
> 7.86078 6 result
> 7.72614 2 32
> 7.72546 5 error
> 7.70867 1 j
> 7.63806 3 buf
> 7.54322 2 id
> 7.53539 8 operator
> 7.49691 2 |=
> 7.47205 8 uint32_t
> 7.30431 5 float
> 7.21538 7 nullptr
> 7.16842 8 template
> 7.086 6 length
> 7.08568 4 goto
> 6.99334 3 ret
> 6.93405 1 9
> 6.85713 3 str
> 6.856 6 delete
> 6.79929 4 argv
> 6.71654 11 static_cast
> 6.69779 2 12
> 6.66625 6 strlen
> 6.62721 5 index
> 6.59375 6 memset
> 6.59178 4 argc
> 6.56873 4 free
> 6.56158 1 r
> 6.50229 1 d
> 6.42083 7 QString
> 6.37432 1 %
> 6.36934 3 100
> 6.25097 6 memcpy
> 6.22253 1 t
> 6.2055 5 begin
> 6.17521 2 20
> 6.06282 4 next
> 6.03021 6 offset
> 5.96787 2 do
> 5.95124 1 f
> 5.90842 3 get
> 5.65135 4 '\0'
> 5.60677 3 key
> 5.58134 5 clear
> 5.57773 1 v
> 5.56596 6 strcmp
> 5.56439 6 assert
> 5.54917 3 val
> 5.5386 4 base
> 5.53583 5 start
> 5.4118 7 uint8_t
> 5.40151 8 override
> 5.39677 5 state
> 5.35496 5 FALSE
> 5.33222 6 printf
> 5.31813 5 width
> 5.29909 4 TRUE
> 5.26703 2 11
> 5.25711 2 15
> 5.19919 3 256
> 5.15902 2 64
> 5.09668 9 push_back
> 5.08447 7 fprintf
> 5.07214 3 0.0
> 5.05989 6 buffer
> 5.05306 4 "\n"
> 4.97602 3 out
> 4.93754 1 e
> 4.88545 5 undef
> 4.80965 6 status
> 4.78736 6 pragma
> 4.78451 4 path
> 4.77394 8 typename
> 4.77209 3 pos
> 4.7502 2 24
> 4.72839 1 m
> 4.72827 4 auto
> 4.72811 3 1.0
> 4.72466 4 FILE
> 4.71972 10 "config.h"
> 4.69943 5 empty
> 4.68814 4 info
> 4.58881 6 height
> 4.42758 2 &=
> 4.38769 4 list
> 4.36853 3 arg
> 4.36709 5 first
> 4.3591 1 k
> 4.34889 6 stderr
> 4.33375 10 <unistd.h>
> 4.30832 8 explicit
> 4.29555 1 w
> 4.28651 2 13
> 4.26294 4 1024
> 4.23803 3 max
> 4.23213 4 file
> 4.19995 4 mode
> 4.19915 2 14
> 4.1875 3 err
> 4.18156 4 1000
> 4.13589 1 h
> 4.10701 3 ...
> 4.10187 3 tmp
> 4.07768 3 ptr
> 4.07431 3 128
> 4.05013 8 filename
> 4.02326 6 malloc
> 3.9814 4 exit
> 3.97719 3 "C"
> 3.96775 1 l
> 3.914 5 close
> 3.89436 8 <string>
> 3.83018 3 map
> 3.77539 3 set
> 3.77113 4 text
> 3.75599 4 init
> 3.75502 5 c_str
> 3.70618 2 30
> 3.69811 3 res
> 3.68075 2 *=
> 3.67039 1 T
> 3.66083 3 src
> 3.65501 5 short
> 3.61046 8 uint64_t
> 3.58757 3 msg
> 3.52503 6 format
> 3.50109 5 event
> 3.4957 4 args
> 3.47401 9 <errno.h>
> 3.42481 8 <vector>
> 3.39625 5 errno
> 3.3942 3 min
> 3.38842 8 Q_OBJECT
> 3.37584 5 reset
> 3.37524 3 ' '
> 3.37167 7 QObject
> 3.36693 4 endl
> 3.32262 7 context
> 3.31921 4 line
> 3.30507 6 insert
> 3.29804 7 QWidget
> 3.28334 6 second
> 3.23301 10 unique_ptr
> 3.21899 4 find
> 3.21831 3 obj
> 3.19706 8 iterator
> 3.19349 4 addr
> 3.15689 4 read
> 3.14999 2 fd
> 3.14251 7 message
> 3.13946 2 it
> 3.11347 13 <sys/types.h>
> 3.08375 2 50
> 3.03804 2 17
> 3.03599 4 0xff
> 3.028 8 gboolean
> 3.01382 4 '\n'
> 2.99864 8 uint16_t
> 2.99655 6 append
> 2.9945 4 once
> 2.97803 4 open
> 2.9653 2 18
> 2.96453 7 isEmpty
> 2.9559 5 write
> 2.95546 7 sprintf
> 2.93702 4 node
> 2.82001 3 255
> 2.81507 13 HAVE_CONFIG_H
> 2.81499 5 boost
> 2.81065 3 " "
> 2.80917 4 time
> 2.79439 4 0x01
> 2.78181 7 connect
> 2.77037 10 <config.h>
> 2.75382 7 int32_t
> 2.75201 11 __cplusplus
> 2.74964 6 String
> 2.73896 1 _
> 2.73574 2 31
> 2.73305 4 0x80
> 2.71341 7 version
> 2.67485 5 throw
>
> Enjoy,
> Andrew.
>
> --
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> https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals
>