[string.ops] (original) (raw)

27 Strings library [strings]

27.4 String classes [string.classes]

27.4.3 Class template basic_string [basic.string]

27.4.3.8 String operations [string.ops]

27.4.3.8.1 Accessors [string.accessors]

constexpr const charT* c_str() const noexcept;constexpr const charT* data() const noexcept;

Returns: A pointer p such that p + i == addressof(operator[](i)) for eachi in [0, size()].

Complexity: Constant time.

Remarks: The program shall not modify any of the values stored in the character array; otherwise, the behavior is undefined.

constexpr charT* data() noexcept;

Returns: A pointer p such that p + i == addressof(operator[](i)) for eachi in [0, size()].

Complexity: Constant time.

Remarks: The program shall not modify the value stored at p + size()to any value other than charT(); otherwise, the behavior is undefined.

constexpr operator basic_string_view<charT, traits>() const noexcept;

Effects: Equivalent to:return basic_string_view<charT, traits>(data(), size());

constexpr allocator_type get_allocator() const noexcept;

Returns: A copy of theAllocatorobject used to construct the string or, if that allocator has been replaced, a copy of the most recent replacement.

27.4.3.8.2 Searching [string.find]

Let F be one offind, rfind, find_first_of, find_last_of,find_first_not_of, and find_last_not_of.

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:

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 tois_nothrow_convertible_v<const T&, basic_string_view<charT, traits>>.

27.4.3.8.3 basic_string​::​substr [string.substr]

constexpr basic_string substr(size_type pos = 0, size_type n = npos) const &;

Effects: Equivalent to: return basic_string(*this, pos, n);

constexpr basic_string substr(size_type pos = 0, size_type n = npos) &&;

Effects: Equivalent to: return basic_string(std​::​move(*this), pos, n);

27.4.3.8.4 basic_string​::​compare [string.compare]

template<class T> constexpr int compare(const T& t) const noexcept(_see below_);

Constraints:

Effects: Equivalent to: return basic_string_view<charT, traits>(*this).compare(t);

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

template<class T> constexpr int compare(size_type pos1, size_type n1, const T& t) const;

Constraints:

Effects: Equivalent to:return basic_string_view<charT, traits>(*this).substr(pos1, n1).compare(t);

template<class T> constexpr int compare(size_type pos1, size_type n1, const T& t, size_type pos2, size_type n2 = npos) const;

Constraints:

Effects: Equivalent to:basic_string_view<charT, traits> s = *this, sv = t;return s.substr(pos1, n1).compare(sv.substr(pos2, n2));

constexpr int compare(const basic_string& str) const noexcept;

Effects: Equivalent to:return compare(basic_string_view<charT, traits>(str));

constexpr int compare(size_type pos1, size_type n1, const basic_string& str) const;

Effects: Equivalent to:return compare(pos1, n1, basic_string_view<charT, traits>(str));

constexpr int compare(size_type pos1, size_type n1, const basic_string& str, size_type pos2, size_type n2 = npos) const;

Effects: Equivalent to:return compare(pos1, n1, basic_string_view<charT, traits>(str), pos2, n2);

constexpr int compare(const charT* s) const;

Effects: Equivalent to:return compare(basic_string_view<charT, traits>(s));

constexpr int compare(size_type pos, size_type n1, const charT* s) const;

Effects: Equivalent to: return compare(pos, n1, basic_string_view<charT, traits>(s));

constexpr int compare(size_type pos, size_type n1, const charT* s, size_type n2) const;

Effects: Equivalent to: return compare(pos, n1, basic_string_view<charT, traits>(s, n2));

27.4.3.8.5 basic_string​::​starts_with [string.starts.with]

constexpr bool starts_with(basic_string_view<charT, traits> x) const noexcept;constexpr bool starts_with(charT x) const noexcept;constexpr bool starts_with(const charT* x) const;

Effects: Equivalent to:return basic_string_view<charT, traits>(data(), size()).starts_with(x);

27.4.3.8.6 basic_string​::​ends_with [string.ends.with]

constexpr bool ends_with(basic_string_view<charT, traits> x) const noexcept;constexpr bool ends_with(charT x) const noexcept;constexpr bool ends_with(const charT* x) const;

Effects: Equivalent to:return basic_string_view<charT, traits>(data(), size()).ends_with(x);

27.4.3.8.7 basic_string​::​contains [string.contains]

constexpr bool contains(basic_string_view<charT, traits> x) const noexcept;constexpr bool contains(charT x) const noexcept;constexpr bool contains(const charT* x) const;

Effects: Equivalent to:return basic_string_view<charT, traits>(data(), size()).contains(x);