22 Containers library [containers]

22.4 Associative containers [associative]

22.4.4 Class template map [map]

22.4.4.3 Element access [map.access]

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mapped_type& operator[](const key_type& x);
1
#
Effects: Equivalent to: return try_­emplace(x).first->second;
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mapped_type& operator[](key_type&& x);
2
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Effects: Equivalent to: return try_­emplace(move(x)).first->second;
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mapped_type& at(const key_type& x); const mapped_type& at(const key_type& x) const;
3
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Returns: A reference to the mapped_­type corresponding to x in *this.
4
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Throws: An exception object of type out_­of_­range if no such element is present.
5
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Complexity: Logarithmic.