dereferencing pointer to incomplete type 'struct base' code example

Example 1: error: dereferencing pointer to incomplete type

The “dereferencing pointer to incomplete type” error commonly occurs in C when one tries to dereference a type (usually a struct) that is:

not declared at all.
declared, but not defined.

Example 2: dereferencing pointer to incomplete type ‘struct dirent

dereferencing pointer to incomplete type ‘struct dirent