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Showing content from https://timsong-cpp.github.io/cppwp/n4659/map.access below:

[map.access]

26 Containers library [containers] 26.4 Associative containers [associative] 26.4.4 Class template map [map] 26.4.4.3 map element access [map.access]

T& operator[](const key_type& x);

Effects: Equivalent to: return try_­emplace(x).first->second;

T& operator[](key_type&& x);

Effects: Equivalent to: return try_­emplace(move(x)).first->second;

T& at(const key_type& x); const T& at(const key_type& x) const;

Returns: A reference to the mapped_­type corresponding to x in *this.

Throws: An exception object of type out_­of_­range if no such element is present.


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