CODEWITHSUNDEEP
c++decltypeconst-cast
hdamlaj
hdamlaj

Reputation: 51

Removing const qualifier from type-inference return type

Quick question for the folks out there. I have the function signature below that under some but not all circumstances returns a const type qualifier on the return type.

template <typename U,
          typename V,
          std::enable_if_t<std::is_arithmetic<V>::value, int>/* = 0*/ > // SFINAE dummy
Vector3D<decltype(std::declval<U>() / std::declval<V>())> operator/ (const Vector3D<U>& p_vector, const Matrix3D<V>& p_matrix)

How can I use const_cast to remove any const qualifiers returned by decltype(std::declval<U>() / std::declval<V>())?

Upvotes: 0

Views: 624

Answers (1)

bolov
bolov

Reputation: 75717

The answer is std::remove_const:

template <typename U,
          typename V,
          std::enable_if_t<std::is_arithmetic<V>::value, int>/* = 0*/ > // SFINAE dummy
Vector3D<std::remove_const_t<decltype(std::declval<U>() / std::declval<V>())>>
operator/ (const Vector3D<U>& p_vector, const Matrix3D<V>& p_matrix)

If U/V might return a reference you might want std::remove_cvref instead.

Upvotes: 2

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