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  1.  
  2.     #include <stdio.h>
  3.  
  4.     // Forward declaration: Here is the name of the structure
  5.     // but field-details are omitted.
  6.     struct IO_config_t;
  7.  
  8.     // typedef of the structure
  9.     // Still no details on the fields.
  10.     typedef struct IO_config_t  IO_config_t;
  11.  
  12.     // The parameter is listed.
  13.     typedef void (*IO_fun_ptr_t)(IO_config_t* input);
  14.  
  15.     // Now we actually detail the members of the structure
  16.     struct IO_config_t{
  17.       int                   address;
  18.       IO_fun_ptr_t          IO_fun_ptr; //pointer to the function to be used
  19.     };
  20.  
  21.     void print_address (IO_config_t *input){
  22.       printf("The address is %d \n", input->address);
  23.       printf("Push any key to continue:");
  24.       getchar();
  25.     }
  26.  
  27.     void main()
  28.     {
  29.       IO_config_t             input = {.address = 16,
  30.                                        .IO_fun_ptr = &print_address};
  31.  
  32.       input.IO_fun_ptr(&input);
  33.  
  34.     }
Runtime error #stdin #stdout 0s 4572KB
comments (?)
stdin 
Standard input is empty
stdout 
The address is 16 
Push any key to continue:
https://ideone.com/p3jBYt
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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