value context

[subramanian100in]

What is meant by value context ?

I could not find the definition for value context in

www.open-std.org.jtc1.sc22.wg14.www.docs.n1124.pdf

 

[santosh]

What is meant by value context ?

I could not find the definition for value context in

www.open-std.org.jtc1.sc22.wg14.www.docs.n1124.pdf

Just about everything about C has been discussed previously in this
group, at one time or another. You should try a search of Google
Group's archive of this group before posting. Here's a good
explanation by Chris Torek:

<http://groups.google.com/group/comp.lang.c/msg/687fcae0d3ecb089>

 

[Richard Heathfield]

(e-mail address removed), India said:

What is meant by value context ?

It is not a formal term. When people on this newsgroup use it, they
generally mean:

(a) we're not talking declaration or definition of the object in
question, AND
(c) we're not talking assignment TO the object, AND
(c) we're not talking sizeof, AND
(d) we're not talking &.

Just about all that remains is the use of the name of an object to
indicate that we want to read its value. This is important for arrays:

int foo[] = { 1, 2, 3 }; /* not a value context for foo */
size_t s = sizeof foo; /* not a value context for foo */
int (*ap)[3] = &foo; /* not a value context for foo */
int *ip = foo; /* this *is* a value context */

I could not find the definition for value context in

www.open-std.org.jtc1.sc22.wg14.www.docs.n1124.pdf

Right. It is not a formal term. It's just something that everybody knows
(except for those who don't know, of course - which is why asking
questions is such a good idea).

 

[Keith Thompson]

(e-mail address removed), India said:

What is meant by value context ?

It is not a formal term. When people on this newsgroup use it, they
generally mean:

(a) we're not talking declaration or definition of the object in
question, AND
(c) we're not talking assignment TO the object, AND
(c) we're not talking sizeof, AND
(d) we're not talking &.

Just about all that remains is the use of the name of an object to
indicate that we want to read its value. This is important for arrays:

int foo[] = { 1, 2, 3 }; /* not a value context for foo */
size_t s = sizeof foo; /* not a value context for foo */
int (*ap)[3] = &foo; /* not a value context for foo */
int *ip = foo; /* this *is* a value context */

I could not find the definition for value context in

www.open-std.org.jtc1.sc22.wg14.www.docs.n1124.pdf

Right. It is not a formal term. It's just something that everybody knows
(except for those who don't know, of course - which is why asking
questions is such a good idea).

And to describe it using a formal term that *is* found in the
standard, a value context is an expression context that doesn't
require an lvalue.