From Jason Turner

[string.access]

C++17 → C++20 1.7 KB 28 lines
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Archived: C++17 | C++20
Markdown: C++17 | C++20
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  1. tmp/tmpdc38pps5/{from.md → to.md} +12 -12
tmp/tmpdc38pps5/{from.md → to.md} RENAMED
@@ -1,13 +1,13 @@
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- #### `basic_string` element access <a id="string.access">[[string.access]]</a>
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  ``` cpp
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- const_reference operator[](size_type pos) const;
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- reference operator[](size_type pos);
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  ```
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- *Requires:* `pos <= size()`.
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  *Returns:* `*(begin() + pos)` if `pos < size()`. Otherwise, returns a
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  reference to an object of type `charT` with value `charT()`, where
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  modifying the object to any value other than `charT()` leads to
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  undefined behavior.
@@ -15,31 +15,31 @@ undefined behavior.
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  *Throws:* Nothing.
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  *Complexity:* Constant time.
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  ``` cpp
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- const_reference at(size_type pos) const;
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- reference at(size_type pos);
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  ```
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  *Throws:* `out_of_range` if `pos >= size()`.
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  *Returns:* `operator[](pos)`.
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  ``` cpp
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- const charT& front() const;
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- charT& front();
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  ```
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- *Requires:* `!empty()`.
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  *Effects:* Equivalent to: `return operator[](0);`
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  ``` cpp
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- const charT& back() const;
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- charT& back();
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  ```
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- *Requires:* `!empty()`.
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  *Effects:* Equivalent to: `return operator[](size() - 1);`
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+ #### Element access <a id="string.access">[[string.access]]</a>
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  ``` cpp
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+ constexpr const_reference operator[](size_type pos) const;
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+ constexpr reference operator[](size_type pos);
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  ```
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+ *Preconditions:* `pos <= size()`.
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  *Returns:* `*(begin() + pos)` if `pos < size()`. Otherwise, returns a
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  reference to an object of type `charT` with value `charT()`, where
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  modifying the object to any value other than `charT()` leads to
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  undefined behavior.
 
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  *Throws:* Nothing.
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  *Complexity:* Constant time.
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  ``` cpp
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+ constexpr const_reference at(size_type pos) const;
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+ constexpr reference at(size_type pos);
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  ```
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  *Throws:* `out_of_range` if `pos >= size()`.
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  *Returns:* `operator[](pos)`.
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  ``` cpp
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+ constexpr const charT& front() const;
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+ constexpr charT& front();
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  ```
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+ *Preconditions:* `!empty()`.
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  *Effects:* Equivalent to: `return operator[](0);`
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  ``` cpp
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+ constexpr const charT& back() const;
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+ constexpr charT& back();
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  ```
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+ *Preconditions:* `!empty()`.
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  *Effects:* Equivalent to: `return operator[](size() - 1);`
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