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#### Construction and assignment <a id="string.view.cons">[[string.view.cons]]</a>
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``` cpp
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constexpr basic_string_view() noexcept;
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```
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*Effects:* Constructs an empty `basic_string_view`.
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*Postconditions:* `size_ == 0` and `data_ == nullptr`.
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``` cpp
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constexpr basic_string_view(const charT* str);
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```
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*Requires:* \[`str`, `str + traits::length(str)`) is a valid range.
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*Effects:* Constructs a `basic_string_view`, with the postconditions in
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Table [[tab:string.view.ctr.2]].
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*Complexity:* 𝑂(`traits::length(str)`).
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``` cpp
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constexpr basic_string_view(const charT* str, size_type len);
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```
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*Requires:* \[`str`, `str + len`) is a valid range.
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*Effects:* Constructs a `basic_string_view`, with the postconditions in
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Table [[tab:string.view.ctr.3]].
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