pointer and const – const Struct* const* s ?

まず基本から．

const Struct s;
// s is a const Struct.

const Struct* s;
// s is a (non-const) pointer to a const Struct.

Struct* const s;
// s is a const pointer to a (non-const) Struct.

では，

const Struct** s;
const Struct* const* s;
const Struct* const* const s;

は？

const Struct** s;
// s is a (non-const) pointer to a (non-const) pointer to a const Struct.

const Struct* const* s;
// s is a (non-const) pointer to a const pointer to a const Struct.

const Struct* const* const s;
// s is a const pointer to a const pointer to a const Struct.

混乱する．

以下が参考になる

pointer and const – const Struct* const* s ? –