Some C++ Keyword Not Detected

bijanbina

hi in "C++ Reference":http://www.cppreference.com/wiki/keywords/start @and@ is c++ keyword but qt doesn't know it as c++ keyword!
how can i add it to qt c++ editor this keyword.
i also use "Generic highlight " but i find that it's not work for c++ and QML and it's just work for other language that qt not create an official engine for it!

andre

I suggest you file a bugreport in "Jira":http://bugreports.qt.nokia.com on this.

bijanbina

ok file it on Jira you can find it "here":http://bugreports.qt.nokia.com/browse/QTCREATORBUG-5169

loladiro

The problem here is, that "and" is an alias for "&&" and is therefore highlighted just as the operator it stands for (in this case not at all). I think this is the correct behavior.

bijanbina

ok you are write the qt detect it as operator but Indeed and it's not an operator and it's a c++ keyword!
it's just a bug reason!

loladiro

It is an operator. Using and would cause the operator&&() method to be called if overloaded. Every operator is also a keyword, but not every keyword is an operator.

EDIT: I probably used keyword incorrectly here, what I actually meant is closer to token (See my next post on the for the definition of keyword in the c++ standard)

bijanbina

no ! is + is a keyword?
and you can see all reference for this that say and is a keyword ! why you want to fight when all reference say the true

loladiro

I'm sorry, I probably formulated that incorrectly. I think it's not our decision to make (we'll see what the Qt developers say). A little more information on what I base my opinion. From the standard (Section 2.12.1):
[quote]
The identiﬁers shown in Table 3 are reserved for use as keywords (that is, they are unconditionally treated
as keywords in phase 7) except in an attribute-token (7.6.1) [ Note: The export keyword is unused but is
reserved for future use. — end note ]:
Table 3 — Keywords
alignof
asm
auto
bool
break
case
catch
char
char16_t
char32_t
class
const
constexpr
const_cast
continue
decltype
default
delete
do
double
dynamic_cast
else
enum
explicit
export
extern
false
float
for
friend
goto
if
inline
int
long
mutable
namespace
new
noexcept
nullptr
operator
private
protected
public
register
reinterpret_cast
return
short
signed
sizeof
static
static_assert
static_cast
struct
switch
template
this
thread_local
throw
true
try
typedef
typeid
typename
union
unsigned
using
virtual
void
volatile
wchar_t
while
[/quote]
In my opinion, even though the aliases are reserved and cannot be used as variable names, they should not be highlighted the same way as the ones that are explicitly called keywords, but rather like operators, as they behave and are used exactly as such:

As you can see in the following two exerts from the standard, the aliases are defined as operators (1st quote), even though it is noted in the keywords section, that they should be not used as variable names (2nd quote)

[quote]
The lexical representation of C++ programs includes a number of preprocessing tokens which are used in
the syntax of the preprocessor or are converted into tokens for operators and punctuators:
preprocessing-op-or-punc: one
{
}
[
<:
:>
<%
new delete
?
+

!

<
ˆ=
&=
|=
<=

=
&&
and and_eq
bitand
or
or_eq
xor
of
]
%>
::
/

<<
||
bitor
xor_eq

%:
.
%
+=

++
compl

%:%:
.*
ˆ
-=

=
--
not
(
;
)
:
&
=
<<=
,
not_eq
|
/=
==
->
...
∼
%=
!=
->
[/quote]

[quote]
Furthermore, the alternative representations shown in Table 4 for certain operators and punctuators (2.6)
are reserved and shall not be used otherwise:
Table 4 — Alternative representations
and
not_eq
and_eq
or
bitand
or_eq
bitor
xor
compl
xor_eq
not
[/quote]

bijanbina

can you link your reference

loladiro

I was referring to the ISO/IEC 14882 (C++ standard) available as direct download "here":http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3092.pdf or as a draft from February 2011 "here":http://open-std.org/JTC1/SC22/WG21/docs/papers/2011/n3242.pdf. You can find the project page (with other specifications) "here":http://open-std.org/JTC1/SC22/WG21/docs/projects#14882

EDIT: Warning! Big PDF files (10MB)

Some C++ Keyword Not Detected

[quote] The lexical representation of C++ programs includes a number of preprocessing tokens which are used in the syntax of the preprocessor or are converted into tokens for operators and punctuators: preprocessing-op-or-punc: one { } [ <: :> <% new delete ? +

!

[quote]
The lexical representation of C++ programs includes a number of preprocessing tokens which are used in
the syntax of the preprocessor or are converted into tokens for operators and punctuators:
preprocessing-op-or-punc: one
{
}
[
<:
:>
<%
new delete
?
+