tmp/tmpe9b2a860/{from.md → to.md}
RENAMED
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@@ -1,28 +1,56 @@
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#### Element access <a id="map.access">[[map.access]]</a>
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``` cpp
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mapped_type& operator[](const key_type& x);
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```
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*Effects:* Equivalent to: `return try_emplace(x).first->second;`
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``` cpp
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mapped_type& operator[](key_type&& x);
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```
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*Effects:* Equivalent to:
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`return try_emplace(std::move(x)).first->second;`
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``` cpp
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mapped_type&
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```
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*Returns:* A reference to the `mapped_type` corresponding to `x` in
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`*this`.
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*Throws:* An exception object of type `out_of_range` if no such element
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is present.
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*Complexity:* Logarithmic.
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#### Element access <a id="map.access">[[map.access]]</a>
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``` cpp
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+
constexpr mapped_type& operator[](const key_type& x);
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```
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*Effects:* Equivalent to: `return try_emplace(x).first->second;`
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``` cpp
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constexpr mapped_type& operator[](key_type&& x);
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```
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*Effects:* Equivalent to:
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`return try_emplace(std::move(x)).first->second;`
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``` cpp
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template<class K> constexpr mapped_type& operator[](K&& x);
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```
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*Constraints:* The *qualified-id* `Compare::is_transparent` is valid and
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denotes a type.
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*Effects:* Equivalent to:
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`return try_emplace(std::forward<K>(x)).first->second;`
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``` cpp
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constexpr mapped_type& at(const key_type& x);
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constexpr const mapped_type& at(const key_type& x) const;
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```
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*Returns:* A reference to the `mapped_type` corresponding to `x` in
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`*this`.
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*Throws:* An exception object of type `out_of_range` if no such element
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is present.
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*Complexity:* Logarithmic.
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``` cpp
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template<class K> constexpr mapped_type& at(const K& x);
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template<class K> constexpr const mapped_type& at(const K& x) const;
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```
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*Constraints:* The *qualified-id* `Compare::is_transparent` is valid and
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denotes a type.
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*Preconditions:* The expression `find(x)` is well-formed and has
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well-defined behavior.
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*Returns:* A reference to `find(x)->second`.
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*Throws:* An exception object of type `out_of_range` if
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`find(x) == end()` is `true`.
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*Complexity:* Logarithmic.
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