21 Strings library [strings]

21.3 String classes [string.classes]

21.3.3 Class template basic_­string [basic.string]

21.3.3.8 String operations [string.ops]

21.3.3.8.2 Searching [string.find]

Let F be one of find, rfind, find_­first_­of, find_­last_­of, find_­first_­not_­of, and find_­last_­not_­of.
  • 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);
  • 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);
  • 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);
  • 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:
  • is_­convertible_­v<const T&, basic_­string_­view<charT, traits>> is true and
  • 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>>.