tmp/tmpwfy64tsz/{from.md → to.md}
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##### `basic_string::substr` <a id="string.substr">[[string.substr]]</a>
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``` cpp
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basic_string substr(size_type pos = 0, size_type n = npos) const;
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```
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*Throws:* `out_of_range` if `pos > size()`.
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*Effects:* Determines the effective length `rlen` of the string to copy
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as the smaller of `n` and `size() - pos`.
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*Returns:* `basic_string(data()+pos, rlen)`.
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