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# dangerousTypeCast
**Message**: Potentially invalid type conversion in old-style C cast, clarify/fix with C++ cast<br/>
**Category**: Type Safety<br/>
**Severity**: Warning<br/>
**Language**: C++, not applicable for C code
## Motivation
C style casts can be dangerous in many ways:
* loss of precision
* loss of sign
* loss of constness
* invalid type conversion
## Philosophy
This checker warns about old style C casts that perform type conversions that can be invalid.
This checker is not about readability. It is about safety.
## How to fix
You can use `dynamic_cast` or `static_cast` to fix these warnings.
Before:
```cpp
struct Base{};
struct Derived: public Base {};
void foo(Base* base) {
Derived *p = (Derived*)base; // <- can be invalid
}
```
After:
```cpp
struct Base{};
struct Derived: public Base {};
void foo(Base* base) {
Derived *p = dynamic_cast<Derived*>(base);
}
```
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