my g++ version is 4.2.3.

when i use word 'and'(or, not) as a variable name or function name, g+
+ compiles error with the following message:

test.cpp:5: error: expected unqualified-id before ‘&&’ token
test.cpp:5: error: expected initializer before ‘&&’ token
test.cpp:6: error: expected identifier before ‘)’ token

it seems that g++ treats 'and' as a keyword for operator "&&", but as
long as i know it is not.

how can i disable this feature for g++

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zade wrote:

> my g++ version is 4.2.3.
>
> when i use word 'and'(or, not) as a variable name or function name, g+
> + compiles error with the following message:
>
> test.cpp:5: error: expected unqualified-id before ?&&? token
> test.cpp:5: error: expected initializer before ?&&? token
> test.cpp:6: error: expected identifier before ?)? token
>
> it seems that g++ treats 'and' as a keyword for operator "&&", but as
> long as i know it is not.
>
> how can i disable this feature for g++
>

It's most likely #defined as '&&' in one of the
header files. Once upon a time it was quite fashionable
for people moving over from PASCAL. They has something
like

#define begin {
#define end }
#define and &&
#define or ||

etc..

<insert sentimental *sigh* here />

HTH

O.


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zade schrieb:
> my g++ version is 4.2.3.
>
> when i use word 'and'(or, not) as a variable name or function name, g+
> + compiles error with the following message:
>
> test.cpp:5: error: expected unqualified-id before ?&&? token
> test.cpp:5: error: expected initializer before ?&&? token
> test.cpp:6: error: expected identifier before ?)? token
>
> it seems that g++ treats 'and' as a keyword for operator "&&", but as
> long as i know it is not.

Sorry, "and" "or" and "not" are C++ keywords, so are bitand, compl
not_eq, or_eq, xor_eq, and_eq, bitor, xor

So long,
Thomas

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Hi

zade wrote:

> it seems that g++ treats 'and' as a keyword for operator "&&", but as
> long as i know it is not.

Well, 'and' is an alternative token for &&. There are others, like 'or'
(||), 'bitor' (|), 'not' (!), or 'xor_eq' (^=). There are even trigraphs
for denoting "uncommon" characters, like '??=' for '#', so that you can
write '??=include <vector>' instead of '#include <vector>'. (in that
context, look up why the trigraph '??/' is especially dreadful)

There might be a way to turn all these off, but that's completely platform
specific.

Markus


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On 2008-08-01 17:58, zade wrote:
> my g++ version is 4.2.3.
>
> when i use word 'and'(or, not) as a variable name or function name, g+
> + compiles error with the following message:
>
> test.cpp:5: error: expected unqualified-id before �&&� token
> test.cpp:5: error: expected initializer before �&&� token
> test.cpp:6: error: expected identifier before �)� token
>
> it seems that g++ treats 'and' as a keyword for operator "&&", but as
> long as i know it is not.
>
> how can i disable this feature for g++

It is a "feature" of the C++ language

and, and_eq, bitand, bitor, compl, not, not_eq, or, or_eq, xor, xor_eq

are all alternative representations of the operators and should not be
used in code.

--
Erik Wikström


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On Aug 1, 11:58 am, zade <zhaohongc...@gmail.com> wrote:
> my g++ version is 4.2.3.
>
> when i use word 'and'(or, not) as a variable name or function name, g+
> + compiles error with the following message:
>
> test.cpp:5: error: expected unqualified-id before ‘&&’ token
> test.cpp:5: error: expected initializer before ‘&&’ token
> test.cpp:6: error: expected identifier before ‘)’ token
>
> it seems that g++ treats 'and' as a keyword for operator "&&", but as
> long as i know it is not.

They're standard. Sorry. They're in lex.key.2 in the standard.

Sean



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zade <zhaohongchao@gmail.com> wrote in news:be809a11-e998-45f4-b71f-
90c5d7c0e00b@o40g2000prn.googlegroups.com:

> my g++ version is 4.2.3.
>
> when i use word 'and'(or, not) as a variable name or function name, g+
> + compiles error with the following message:
>
> test.cpp:5: error: expected unqualified-id before ?&&? token
> test.cpp:5: error: expected initializer before ?&&? token
> test.cpp:6: error: expected identifier before ?)? token
>
> it seems that g++ treats 'and' as a keyword for operator "&&", but as
> long as i know it is not.
>
> how can i disable this feature for g++
>

Ummmmm, I hate to break this to you, but 'and' is a reserved word
representing && in the standard. They are in an table of alternative
representations in [lex.key]/2. Other words in this category are:

and_eq bitand bitor compl not not_eq or or_eq xor and xor_eq

I would guess that there isn't an explicit option in g++ to disable part of
the standard.

joe

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zade wrote:
> my g++ version is 4.2.3.
>
> when i use word 'and'(or, not) as a variable name or function name,
> g+ + compiles error with the following message:
>
> test.cpp:5: error: expected unqualified-id before $B!&(B&$B!&(Btoken
> test.cpp:5: error: expected initializer before $B!&(B&$B!&(Btoken
> test.cpp:6: error: expected identifier before $B!&!&(Btoken
>
> it seems that g++ treats 'and' as a keyword for operator "&&", but
> as long as i know it is not.
>
> how can i disable this feature for g++

The standard really defines these alternate names for operators. The
compiler is quite correct in recognizing them.

With g++, you can turn them off using

-fno-operator-names


Doing so will make your code less portable though.


Bo Persson


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zade ha scritto:
> my g++ version is 4.2.3.
>
> when i use word 'and'(or, not) as a variable name or function name, g+
> + compiles error with the following message:
>
> test.cpp:5: error: expected unqualified-id before �&&� token
> test.cpp:5: error: expected initializer before �&&� token
> test.cpp:6: error: expected identifier before �)� token
>
> it seems that g++ treats 'and' as a keyword for operator "&&", but as
> long as i know it is not.

g++ is correct. Although "and" is not a keyword, as it's not listed in
table 3 in 2.11, it's an "alternative token representation" of &&. The
two spellings are therefore completely equivalent.

>
> how can i disable this feature for g++
>

Frankly I don't know, but you shouldn't try to do that if you want your
code to be portable.

HTH,

Ganesh


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Oncaphillis wrote:

> It's most likely #defined as '&&' in one of the
> header files. Once upon a time it was quite fashionable
> for people moving over from PASCAL. They has something
> like
>
> #define begin {
> #define end }
> #define and &&
> #define or ||
>
> etc..
>
I'm shocked to learn that this is BS
"and" is a key word. Never came across
that..

:-(

O.


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