From Jason Turner

[string.substr]

C++20 → C++23 0.9 KB 15 lines
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  ##### `basic_string::substr` <a id="string.substr">[[string.substr]]</a>
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  ``` cpp
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- constexpr 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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  ##### `basic_string::substr` <a id="string.substr">[[string.substr]]</a>
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  ``` cpp
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+ constexpr basic_string substr(size_type pos = 0, size_type n = npos) const &;
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  ```
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+ *Effects:* Equivalent to: `return basic_string(*this, pos, n);`
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+ ``` cpp
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+ constexpr basic_string substr(size_type pos = 0, size_type n = npos) &&;
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+ ```
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+ *Effects:* Equivalent to:
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+ `return basic_string(std::move(*this), pos, n);`
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