Syntax of generating an object Data for use as functional argument leading to error
We have a typedef *int Data, i am trying to create a generator function
Data data_gen(int idata){
Data d = malloc(sizeof(idata));
d = &idata;
return d;
}
However when I pass this function as argument to another function which requires Data as an argument I recieve the following error, method makes pointer from an integer without a cast, which suggest that my method data_gen is returning an integer as opposed to a data object.
typedef int* Data;
I am calling this function with data_gen and receiving error:
void bstree_insert(BStree bst, Key key, Data data);
where the third argument is call of data_gen
c function pointers
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
add a comment |
We have a typedef *int Data, i am trying to create a generator function
Data data_gen(int idata){
Data d = malloc(sizeof(idata));
d = &idata;
return d;
}
However when I pass this function as argument to another function which requires Data as an argument I recieve the following error, method makes pointer from an integer without a cast, which suggest that my method data_gen is returning an integer as opposed to a data object.
typedef int* Data;
I am calling this function with data_gen and receiving error:
void bstree_insert(BStree bst, Key key, Data data);
where the third argument is call of data_gen
c function pointers
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
add a comment |
We have a typedef *int Data, i am trying to create a generator function
Data data_gen(int idata){
Data d = malloc(sizeof(idata));
d = &idata;
return d;
}
However when I pass this function as argument to another function which requires Data as an argument I recieve the following error, method makes pointer from an integer without a cast, which suggest that my method data_gen is returning an integer as opposed to a data object.
typedef int* Data;
I am calling this function with data_gen and receiving error:
void bstree_insert(BStree bst, Key key, Data data);
where the third argument is call of data_gen
c function pointers
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
We have a typedef *int Data, i am trying to create a generator function
Data data_gen(int idata){
Data d = malloc(sizeof(idata));
d = &idata;
return d;
}
However when I pass this function as argument to another function which requires Data as an argument I recieve the following error, method makes pointer from an integer without a cast, which suggest that my method data_gen is returning an integer as opposed to a data object.
typedef int* Data;
I am calling this function with data_gen and receiving error:
void bstree_insert(BStree bst, Key key, Data data);
where the third argument is call of data_gen
c function pointers
c function pointers
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
edited Nov 22 '18 at 4:19
Ben French
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
asked Nov 22 '18 at 4:01
Ben FrenchBen French
84
84
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
This fixes the bug in your generator function:
Data
data_gen(int idata)
{
Data d = malloc(sizeof(*d));
*d = idata;
return d;
}
A typedef for this function would be:
typedef Data (*data_function)(int);
Then, your tree function would need to be:
void bstree_insert(BStree bst, Key key, data_function gen);
So, right now you're mixing up a simple pointer (i.e. int *) with a pointer to a function that returns an int *. These are not the same thing.
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
ok ill try to fix it thanks for the help!
– Ben French
Nov 22 '18 at 4:38
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This fixes the bug in your generator function:
Data
data_gen(int idata)
{
Data d = malloc(sizeof(*d));
*d = idata;
return d;
}
A typedef for this function would be:
typedef Data (*data_function)(int);
Then, your tree function would need to be:
void bstree_insert(BStree bst, Key key, data_function gen);
So, right now you're mixing up a simple pointer (i.e. int *) with a pointer to a function that returns an int *. These are not the same thing.
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
ok ill try to fix it thanks for the help!
– Ben French
Nov 22 '18 at 4:38
add a comment |
This fixes the bug in your generator function:
Data
data_gen(int idata)
{
Data d = malloc(sizeof(*d));
*d = idata;
return d;
}
A typedef for this function would be:
typedef Data (*data_function)(int);
Then, your tree function would need to be:
void bstree_insert(BStree bst, Key key, data_function gen);
So, right now you're mixing up a simple pointer (i.e. int *) with a pointer to a function that returns an int *. These are not the same thing.
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
ok ill try to fix it thanks for the help!
– Ben French
Nov 22 '18 at 4:38
add a comment |
This fixes the bug in your generator function:
Data
data_gen(int idata)
{
Data d = malloc(sizeof(*d));
*d = idata;
return d;
}
A typedef for this function would be:
typedef Data (*data_function)(int);
Then, your tree function would need to be:
void bstree_insert(BStree bst, Key key, data_function gen);
So, right now you're mixing up a simple pointer (i.e. int *) with a pointer to a function that returns an int *. These are not the same thing.
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
This fixes the bug in your generator function:
Data
data_gen(int idata)
{
Data d = malloc(sizeof(*d));
*d = idata;
return d;
}
A typedef for this function would be:
typedef Data (*data_function)(int);
Then, your tree function would need to be:
void bstree_insert(BStree bst, Key key, data_function gen);
So, right now you're mixing up a simple pointer (i.e. int *) with a pointer to a function that returns an int *. These are not the same thing.
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
edited Nov 22 '18 at 4:28
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
answered Nov 22 '18 at 4:18
Craig EsteyCraig Estey
14.7k21129
14.7k21129
ok ill try to fix it thanks for the help!
– Ben French
Nov 22 '18 at 4:38
add a comment |
ok ill try to fix it thanks for the help!
– Ben French
Nov 22 '18 at 4:38
ok ill try to fix it thanks for the help!
– Ben French
Nov 22 '18 at 4:38
ok ill try to fix it thanks for the help!
– Ben French
Nov 22 '18 at 4:38
add a comment |
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