tmp/tmpy6ecym51/{from.md → to.md}
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| 1 |
+
#### String operations <a id="string.view.ops">[[string.view.ops]]</a>
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| 3 |
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``` cpp
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size_type copy(charT* s, size_type n, size_type pos = 0) const;
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```
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Let `rlen` be the smaller of `n` and `size() - pos`.
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*Throws:* `out_of_range` if `pos > size()`.
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*Requires:* \[`s`, `s + rlen`) is a valid range.
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*Effects:* Equivalent to `traits::copy(s, data() + pos, rlen)`.
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*Returns:* `rlen`.
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*Complexity:* 𝑂(`rlen`).
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``` cpp
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constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
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```
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Let `rlen` be the smaller of `n` and `size() - pos`.
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*Throws:* `out_of_range` if `pos > size()`.
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*Effects:* Determines `rlen`, the effective length of the string to
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reference.
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*Returns:* `basic_string_view(data() + pos, rlen)`.
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``` cpp
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constexpr int compare(basic_string_view str) const noexcept;
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```
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Let `rlen` be the smaller of `size()` and `str.size()`.
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*Effects:* Determines `rlen`, the effective length of the strings to
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compare. The function then compares the two strings by calling
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| 40 |
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`traits::compare(data(), str.data(), rlen)`.
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| 41 |
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*Complexity:* 𝑂(`rlen`).
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*Returns:* The nonzero result if the result of the comparison is
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| 45 |
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nonzero. Otherwise, returns a value as indicated in
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Table [[tab:string.view.compare]].
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**Table: `compare()` results** <a id="tab:string.view.compare">[tab:string.view.compare]</a>
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| Condition | Return Value |
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| ---------------------- | ------------ |
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| `size() < str.size()` | `< 0` |
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| `size() == str.size()` | ` 0` |
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| `size() > str.size()` | `> 0` |
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| 56 |
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``` cpp
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constexpr int compare(size_type pos1, size_type n1, basic_string_view str) const;
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```
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*Effects:* Equivalent to: `return substr(pos1, n1).compare(str);`
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``` cpp
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constexpr int compare(size_type pos1, size_type n1, basic_string_view str,
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size_type pos2, size_type n2) const;
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```
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| 66 |
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*Effects:* Equivalent to:
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`return substr(pos1, n1).compare(str.substr(pos2, n2));`
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``` cpp
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constexpr int compare(const charT* s) const;
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```
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*Effects:* Equivalent to: `return compare(basic_string_view(s));`
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``` cpp
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constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
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```
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*Effects:* Equivalent to:
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`return substr(pos1, n1).compare(basic_string_view(s));`
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| 82 |
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``` cpp
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| 84 |
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constexpr int compare(size_type pos1, size_type n1,
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| 85 |
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const charT* s, size_type n2) const;
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```
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*Effects:* Equivalent to:
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`return substr(pos1, n1).compare(basic_string_view(s, n2));`
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| 90 |
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