When Should I Use `reinterpret_cast` vs. `static_cast` for Type Conversion in C ?

When to Employ reinterpret_cast

In C , reinterpret_cast and static_cast are used for type conversions. Understanding their distinct applications can be crucial.

static_cast

Static casts are primarily used when the type conversion can be determined at compile time (i.e., static). This includes conversions among compatible types and implicit conversions performed by the compiler.

reinterpret_cast

Reinterpret_casts are employed in two main scenarios:

• Converting integers to pointers and vice versa. This operation is typically necessary when working with low-level memory manipulation.
• Converting pointers of one type to another. However, it's important to note that this conversion is non-portable and should be used sparingly.

Confusion with void* Conversions

When passing C objects to C code, the C code typically needs to store them as void pointers. The choice of cast here is crucial:

• static_cast: Guarantees that casting a pointer to void* and back preserves the address.
• reinterpret_cast: Only ensures that if a pointer is cast to a different type and then back to the original type, the original value is retained.

For conversions to and from void*, static_cast is generally preferred as it guarantees address preservation, which is crucial in this context.

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