21 Strings library [strings]

21.4 String view classes [string.view]

21.4.2 Class template basic_­string_­view [string.view.template]

21.4.2.1 Construction and assignment [string.view.cons]

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constexpr basic_string_view() noexcept;
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Postconditions: size_­ == 0 and data_­ == nullptr.
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constexpr basic_string_view(const charT* str);
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Preconditions: [str, str + traits​::​length(str)) is a valid range.
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Effects: Constructs a basic_­string_­view, initializing data_­ with str and initializing size_­ with traits​::​length(str).
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Complexity: .
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constexpr basic_string_view(const charT* str, size_type len);
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Preconditions: [str, str + len) is a valid range.
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Effects: Constructs a basic_­string_­view, initializing data_­ with str and initializing size_­ with len.
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template<class It, class End> constexpr basic_string_view(It begin, End end);
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Constraints:
  • (7.1)
    It satisfies contiguous_­iterator.
  • (7.2)
    End satisfies sized_­sentinel_­for<It>.
  • (7.3)
    is_­same_­v<iter_­value_­t<It>, charT> is true.
  • (7.4)
    is_­convertible_­v<End, size_­type> is false.
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Preconditions:
  • (8.1)
    [begin, end) is a valid range.
  • (8.2)
    It models contiguous_­iterator.
  • (8.3)
    End models sized_­sentinel_­for<It>.
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Effects: Initializes data_­ with to_­address(begin) and initializes size_­ with end - begin.