It really depends on the target architecture (and ABI), size of the struct and how fields in the struct are defined, more than if it's C or C++. For simple exam

It really depends on the target architecture (and ABI), size of the struct and how fields in the struct are defined, more than if it's C or C++. For simple examples like this one: https://godbolt.org/g/ZT3bJ3 https://godbolt.org/g/ZT3bJ3 there usually will be no problem.