5.1 KiB
[string.view.cons]
27 Strings library [strings]
27.3 String view classes [string.view]
27.3.3 Class template basic_string_view [string.view.template]
27.3.3.2 Construction and assignment [string.view.cons]
constexpr basic_string_view() noexcept;
Postconditions: size_ == 0 and data_ == nullptr.
constexpr basic_string_view(const charT* str);
Preconditions: [str, str + traits::length(str)) is a valid range.
Effects: Constructs a basic_string_view, initializing data_ with str and initializing size_ with traits::length(str).
Complexity: O(traits::length(str)).
constexpr basic_string_view(const charT* str, size_type len);
Preconditions: [str, str + len) is a valid range.
Effects: Constructs a basic_string_view, initializing data_ with str and initializing size_ with len.
template<class It, class End> constexpr basic_string_view(It begin, End end);
Constraints:
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It satisfies contiguous_iterator.
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End satisfies sized_sentinel_for.
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is_same_v<iter_value_t, charT> is true.
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is_convertible_v<End, size_type> is false.
Preconditions:
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[begin, end) is a valid range.
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It models contiguous_iterator.
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End models sized_sentinel_for.
Effects: Initializes data_ with to_address(begin) and initializes size_ with end - begin.
Throws: When and what end - begin throws.
template<class R> constexpr explicit basic_string_view(R&& r);
Let d be an lvalue of type remove_cvref_t.
Constraints:
remove_cvref_t is not the same type as basic_string_view,
R modelsranges::contiguous_range and ranges::sized_range,
is_same_v<ranges::range_value_t, charT> is true,
is_convertible_v<R, const charT*> is false, and
d.operator ::std::basic_string_view<charT, traits>() is not a valid expression.
Effects: Initializes data_ with ranges::data(r) andsize_ with ranges::size(r).
Throws: Any exception thrown by ranges::data(r) and ranges::size(r).