Why Doesn\'t `std::is_struct` Distinguish Between Structs and Classes in C ?

Why std::is_struct Doesn't Differentiate Between Structs and Classes

In C , you might encounter situations where distinguishing between classes and structs is important. However, the std::is_struct type trait doesn't provide this distinction. Understanding why can clarify misconceptions about classes and structs.

Misconception: Structs and Classes are Different Types

The statement "there is no difference between structs and classes except visibility" can create confusion. In actuality, C has classes since 1985 and the struct keyword is for backward compatibility with C.

Reality: All Types Declared with class and struct are Classes

The struct keyword only affects the default visibility of members and bases. Both types declared with class and struct are classes.

Conclusion

std::is_struct doesn't differentiate between structs and classes because there is no such distinction in C . Classes declared with both class and struct are the same type and have the same visibility rules.

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