24 Strings library [strings]

24.4 String view classes [string.view]

24.4.2 Class template basic_­string_­view [string.view.template]

24.4.2.4 Element access [string.view.access]

constexpr const_reference operator[](size_type pos) const;

1
#

Requires: pos < size().

2
#

Returns: data_­[pos].

3
#

Throws: Nothing.

4
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[ Note: Unlike basic_­string​::​operator[], basic_­string_­view​::​operator[](size()) has undefined behavior instead of returning charT().  — end note ]

constexpr const_reference at(size_type pos) const;

5
#

Throws: out_­of_­range if pos >= size().

6
#

Returns: data_­[pos].

constexpr const_reference front() const;

7
#

Requires: !empty().

8
#

Returns: data_­[0].

9
#

Throws: Nothing.

constexpr const_reference back() const;

10
#

Requires: !empty().

11
#

Returns: data_­[size() - 1].

12
#

Throws: Nothing.

constexpr const_pointer data() const noexcept;

13
#

Returns: data_­.

14
#

[ Note: Unlike basic_­string​::​data() and string literals, data() may return a pointer to a buffer that is not null-terminated. Therefore it is typically a mistake to pass data() to a function that takes just a const charT* and expects a null-terminated string.  — end note ]