# V1117\. The declared function type is cv\-qualified\. The behavior when using this type is undefined\.

The analyzer has detected a declared function type with the const or volatile qualifiers in C code\. Using these types leads to undefined behavior, as specified in Clause 10 of Paragraph 6\.7\.4\.1 in C23\.

The code example where the analyzer issues warnings: 

```cpp
typedef int fun_t(void);

typedef const fun_t const_qual_fun_t;          // V1117

typedef const fun_t * ptr_to_const_qual_fun_t; // V1117

void foo()
{
  const fun_t c_fun_t;       // V1117
  const fun_t * ptr_c_fun_t; // V1117
}
```

To ensure proper functionality, the `const` qualifier should be removed when declaring the function type\. The fixed code looks like this:

```cpp
typedef int fun_t(void);

typedef fun_t const_qual_fun_t;          // ok

typedef fun_t * ptr_to_const_qual_fun_t; // ok

void foo()
{
  fun_t c_fun_t;       // ok
  fun_t * ptr_c_fun_t; // ok
}
```