tmp/tmpu4qcm23k/{from.md → to.md}
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#### `basic_string::find_first_of` <a id="string::find.first.of">[[string::find.first.of]]</a>
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``` cpp
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size_type
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find_first_of(const basic_string& str,
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size_type pos = 0) const noexcept;
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```
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*Effects:* Determines the lowest position `xpos`, if possible, such that
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both of the following conditions obtain:
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- `pos <= xpos` and `xpos < size()`;
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- `traits::eq(at(xpos), str.at(I))` for some element `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
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find_first_of(const charT* s, size_type pos, size_type n) const;
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```
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*Returns:* `find_first_of(basic_string(s, n), pos)`.
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``` cpp
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size_type find_first_of(const charT* s, size_type pos = 0) 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:* `find_first_of(basic_string(s), pos)`.
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``` cpp
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size_type find_first_of(charT c, size_type pos = 0) const;
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```
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*Returns:* `find_first_of(basic_string(1,c), pos)`.
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