[string.find]

(1.1)
Each member function of the form constexpr size_type F(const basic_string& str, size_type pos) const noexcept; has effects equivalent to: return F(basic_string_view<charT, traits>(str), pos);
(1.2)
Each member function of the form constexpr size_type F(const charT* s, size_type pos) const; has effects equivalent to: return F(basic_string_view<charT, traits>(s), pos);
(1.3)
Each member function of the form constexpr size_type F(const charT* s, size_type pos, size_type n) const; has effects equivalent to: return F(basic_string_view<charT, traits>(s, n), pos);
(1.4)
Each member function of the form constexpr size_type F(charT c, size_type pos) const noexcept; has effects equivalent to: return F(basic_string_view<charT, traits>(addressof(c), 1), pos);

template<class T>
  constexpr size_type find(const T& t, size_type pos = 0) const noexcept(see below);
template<class T>
  constexpr size_type rfind(const T& t, size_type pos = npos) const noexcept(see below);
template<class T>
  constexpr size_type find_first_of(const T& t, size_type pos = 0) const noexcept(see below);
template<class T>
  constexpr size_type find_last_of(const T& t, size_type pos = npos) const noexcept(see below);
template<class T>
  constexpr size_type find_first_not_of(const T& t, size_type pos = 0) const noexcept(see below);
template<class T>
  constexpr size_type find_last_not_of(const T& t, size_type pos = npos) const noexcept(see below);

Constraints:

(2.1)
is_convertible_v<const T&, basic_string_view<charT, traits>> is true and
(2.2)
is_convertible_v<const T&, const charT*> is false.

Effects: Let G be the name of the function.

Equivalent to: basic_string_view<charT, traits> s = *this, sv = t; return s.G(sv, pos);

Remarks: The exception specification is equivalent to is_nothrow_convertible_v<const T&, basic_string_view<charT, traits>>.