constexpr const vs constexpr variables?

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The issue is that in a variable declaration, constexpr always applies the const-ness to the object declared; const on the other hand can apply to a different type, depending on the placement.

Thus

constexpr const int i = 3;
constexpr int i = 3;

are equivalent;

constexpr char* p = nullptr;
constexpr char* const p = nullptr;

are equivalent; both make p a const pointer to char.

constexpr const char* p = nullptr;
constexpr const char* const p = nullptr;

are equivalent. constexpr makes p a const pointer. The const in const char * makes p point to const char.

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