24 Containers library [containers]

24.5 Unordered associative containers [unord]

24.5.4 Class template unordered_map [unord.map]

24.5.4.3 Element access [unord.map.elem]

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mapped_type& operator[](const key_type& k);
1
#
Effects: Equivalent to: return try_emplace(k).first->second;
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mapped_type& operator[](key_type&& k);
2
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Effects: Equivalent to: return try_emplace(std​::​move(k)).first->second;
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mapped_type& at(const key_type& k); const mapped_type& at(const key_type& k) const;
3
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Returns: A reference to x.second, where x is the (unique) element whose key is equivalent to k.
4
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Throws: An exception object of type out_of_range if no such element is present.