27 Strings library [strings]

27.3 String view classes [string.view]

27.3.3 Class template basic_string_view [string.view.template]

27.3.3.6 Element access [string.view.access]

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constexpr const_reference operator[](size_type pos) const;
1
#
Hardened preconditions: pos < size() is true.
[Note 1: 
This precondition is stronger than the one on basic_string​::​operator[].
— end note]
2
#
Returns: data_[pos].
3
#
Throws: Nothing.
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constexpr const_reference at(size_type pos) const;
4
#
Returns: data_[pos].
5
#
Throws: out_of_range if pos >= size().
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constexpr const_reference front() const;
6
#
Hardened preconditions: empty() is false.
7
#
Returns: data_[0].
8
#
Throws: Nothing.
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constexpr const_reference back() const;
9
#
Hardened preconditions: empty() is false.
10
#
Returns: data_[size() - 1].
11
#
Throws: Nothing.
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constexpr const_pointer data() const noexcept;
12
#
Returns: data_.
13
#
[Note 2: 
Unlike basic_string​::​data() and string-literals, data() can 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]