tmp/tmpfrvs4ti0/{from.md → to.md}
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#### `basic_string::rfind` <a id="string::rfind">[[string::rfind]]</a>
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``` cpp
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size_type rfind(const basic_string& str,
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size_type pos = npos) const noexcept;
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```
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*Effects:* Determines the highest position `xpos`, if possible, such
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that both of the following conditions obtain:
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- `xpos <= pos` and `xpos + str.size() <= size()`;
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- `traits::eq(at(xpos+I), str.at(I))` for all elements `I` of the string
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controlled by `str`.
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*Returns:* `xpos` if the function can determine such a value for `xpos`.
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Otherwise, returns `npos`.
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*Remarks:* Uses `traits::eq()`.
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``` cpp
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size_type rfind(const charT* s, size_type pos, size_type n) const;
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```
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*Returns:* `rfind(basic_string(s, n), pos)`.
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``` cpp
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size_type rfind(const charT* s, size_type pos = npos) const;
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```
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*Requires:* s points to an array of at least `traits::length(s) + 1`
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elements of `charT`.
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*Returns:* `rfind(basic_string(s), pos)`.
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``` cpp
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size_type rfind(charT c, size_type pos = npos) const;
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```
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*Returns:* `rfind(basic_string(1,c),pos)`.
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