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pillmill asked on

unable to use static_cast ?

I am debugging some legacy C++ code and want to change a
C-style cast to a C++ static_cast. I get syntax errors or
type Eng not found for the changed code:

Eng *      CEng(void)            {  return ( Eng * ) Engi();  }

Eng *      CEng(void)            {  return ( static_cast (Eng *) ) Engi();  }

How can I fix this ?

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Last Comment

8/22/2022 - Mon

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also static_cast does no runtime checking, so you need to avoid any esoteric casts.
For instance you should not cast a struct into an int or a double to a pointer.

In short do not try to subvert the existing type system


>> For instance you should not cast a struct into an int or a double to a pointer.
Um, static_cast performs compile time checks and neither of the two examples you've given would even compile!

@pillmill, What is the return value from Engi()? Is there a polymorphic relationship between this and Eng? Is this performing a down cast? If the answer to these two questions are 'yes' you might want to consider using dynamic cast, which will use RTTI to validate the cast is safe at runtime. If it's not for a pointer type cast it will return NULL rather than a pointer to an invalid object that would result in undefined behavior. You might want to consider reading this tutorial, which explains all the different casting options available to you in C++.


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