Scope of typedefs
I am not at a computer so cannot test this at the moment but have some code to review. I'm still somewhat in a C++ mindframe unfortunatley.
So, when a typedef is declared within a C source file what is its scope? I am aware that to make functions and variables only available within the same translation unit you need to make them static and I was wondering if this is the same for typedefs?
c
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
add a comment |
I am not at a computer so cannot test this at the moment but have some code to review. I'm still somewhat in a C++ mindframe unfortunatley.
So, when a typedef is declared within a C source file what is its scope? I am aware that to make functions and variables only available within the same translation unit you need to make them static and I was wondering if this is the same for typedefs?
c
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
add a comment |
I am not at a computer so cannot test this at the moment but have some code to review. I'm still somewhat in a C++ mindframe unfortunatley.
So, when a typedef is declared within a C source file what is its scope? I am aware that to make functions and variables only available within the same translation unit you need to make them static and I was wondering if this is the same for typedefs?
c
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
I am not at a computer so cannot test this at the moment but have some code to review. I'm still somewhat in a C++ mindframe unfortunatley.
So, when a typedef is declared within a C source file what is its scope? I am aware that to make functions and variables only available within the same translation unit you need to make them static and I was wondering if this is the same for typedefs?
c
c
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
asked Apr 25 '12 at 8:37
FiredragonFiredragon
2,13622162
2,13622162
add a comment |
add a comment |
4 Answers
4
active
oldest
votes
Typedefs are declarations. If you have a typedef in a C file, no other C file will be aware of that since they are compiled indepedendly of each other.
For a typedef in a header, it will of course be visible from all C files that include it.
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
Thanks, that makes sense.
– Firedragon
Apr 25 '12 at 8:44
add a comment |
typedef has the same scope as regular variables in C/C++
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
add a comment |
I dont know whats the meaning of this complex sentence but this is how C standard defines the scope of typedefs:
As a special case, a type name (which is not a declaration of an identifier) is considered to
have a scope that begins just after the place within the type name where the omitted
identifier would appear were it not omitted.
P.S. Somebody please explain.
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
add a comment |
Here is an example showing typedef and scope:
typedef int foo_t;
foo_t x = 1;
double bar(double x) {
typedef double foo_t;
foo_t y = 2.0;
return y + 3.14156;
}
foo_t z = 1;
answered Nov 19 '18 at 23:47
MattWMattW
605
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
Typedefs are declarations. If you have a typedef in a C file, no other C file will be aware of that since they are compiled indepedendly of each other.
For a typedef in a header, it will of course be visible from all C files that include it.
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
Thanks, that makes sense.
– Firedragon
Apr 25 '12 at 8:44
add a comment |
Typedefs are declarations. If you have a typedef in a C file, no other C file will be aware of that since they are compiled indepedendly of each other.
For a typedef in a header, it will of course be visible from all C files that include it.
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
Thanks, that makes sense.
– Firedragon
Apr 25 '12 at 8:44
add a comment |
Typedefs are declarations. If you have a typedef in a C file, no other C file will be aware of that since they are compiled indepedendly of each other.
For a typedef in a header, it will of course be visible from all C files that include it.
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
Typedefs are declarations. If you have a typedef in a C file, no other C file will be aware of that since they are compiled indepedendly of each other.
For a typedef in a header, it will of course be visible from all C files that include it.
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
answered Apr 25 '12 at 8:40
unwindunwind
320k52394526
320k52394526
Thanks, that makes sense.
– Firedragon
Apr 25 '12 at 8:44
add a comment |
Thanks, that makes sense.
– Firedragon
Apr 25 '12 at 8:44
Thanks, that makes sense.
– Firedragon
Apr 25 '12 at 8:44
Thanks, that makes sense.
– Firedragon
Apr 25 '12 at 8:44
add a comment |
typedef has the same scope as regular variables in C/C++
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
add a comment |
typedef has the same scope as regular variables in C/C++
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
add a comment |
typedef has the same scope as regular variables in C/C++
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
typedef has the same scope as regular variables in C/C++
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
answered Apr 25 '12 at 8:40
mihaimihai
23.9k74068
23.9k74068
add a comment |
add a comment |
I dont know whats the meaning of this complex sentence but this is how C standard defines the scope of typedefs:
As a special case, a type name (which is not a declaration of an identifier) is considered to
have a scope that begins just after the place within the type name where the omitted
identifier would appear were it not omitted.
P.S. Somebody please explain.
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
add a comment |
I dont know whats the meaning of this complex sentence but this is how C standard defines the scope of typedefs:
As a special case, a type name (which is not a declaration of an identifier) is considered to
have a scope that begins just after the place within the type name where the omitted
identifier would appear were it not omitted.
P.S. Somebody please explain.
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
add a comment |
I dont know whats the meaning of this complex sentence but this is how C standard defines the scope of typedefs:
As a special case, a type name (which is not a declaration of an identifier) is considered to
have a scope that begins just after the place within the type name where the omitted
identifier would appear were it not omitted.
P.S. Somebody please explain.
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
I dont know whats the meaning of this complex sentence but this is how C standard defines the scope of typedefs:
As a special case, a type name (which is not a declaration of an identifier) is considered to
have a scope that begins just after the place within the type name where the omitted
identifier would appear were it not omitted.
P.S. Somebody please explain.
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
answered Oct 23 '12 at 16:18
bubblebubble
1,74642248
1,74642248
add a comment |
add a comment |
Here is an example showing typedef and scope:
typedef int foo_t;
foo_t x = 1;
double bar(double x) {
typedef double foo_t;
foo_t y = 2.0;
return y + 3.14156;
}
foo_t z = 1;
answered Nov 19 '18 at 23:47
MattWMattW
605
add a comment |
Here is an example showing typedef and scope:
typedef int foo_t;
foo_t x = 1;
double bar(double x) {
typedef double foo_t;
foo_t y = 2.0;
return y + 3.14156;
}
foo_t z = 1;
answered Nov 19 '18 at 23:47
MattWMattW
605
add a comment |
Here is an example showing typedef and scope:
typedef int foo_t;
foo_t x = 1;
double bar(double x) {
typedef double foo_t;
foo_t y = 2.0;
return y + 3.14156;
}
foo_t z = 1;
answered Nov 19 '18 at 23:47
MattWMattW
605
Here is an example showing typedef and scope:
typedef int foo_t;
foo_t x = 1;
double bar(double x) {
typedef double foo_t;
foo_t y = 2.0;
return y + 3.14156;
}
foo_t z = 1;
answered Nov 19 '18 at 23:47
MattWMattW
605
answered Nov 19 '18 at 23:47
MattWMattW
605
answered Nov 19 '18 at 23:47
MattWMattW
605
answered Nov 19 '18 at 23:47
MattWMattW
605
605
add a comment |
add a comment |
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