23 Strings library [strings]

23.3 String view classes [string.view]

23.3.3 Class template basic_string_view [string.view.template]

23.3.3.6 Element access [string.view.access]

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constexpr const_reference operator[](size_type pos) const;
1
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Preconditions: pos < size().
2
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Returns: data_[pos].
3
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Throws: Nothing.
4
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[Note 1: 
Unlike basic_string​::​operator[], basic_string_view​::​operator[](size()) has undefined behavior instead of returning charT().
— end note]
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constexpr const_reference at(size_type pos) const;
5
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Returns: data_[pos].
6
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Throws: out_of_range if pos >= size().
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constexpr const_reference front() const;
7
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Preconditions: !empty().
8
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Returns: data_[0].
9
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Throws: Nothing.
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constexpr const_reference back() const;
10
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Preconditions: !empty().
11
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Returns: data_[size() - 1].
12
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Throws: Nothing.
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constexpr const_pointer data() const noexcept;
13
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Returns: data_.
14
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[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]