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Showing content from https://timsong-cpp.github.io/cppwp/n4140/string.access below:

[string.access]

21.4.5 basic_string element access [string.access]

const_reference operator[](size_type pos) const; reference operator[](size_type pos);

Returns: *(begin() + pos) if pos < size(). Otherwise, returns a reference to an object of type charT with value charT(), where modifying the object leads to undefined behavior.

Complexity: Constant time.

const_reference at(size_type pos) const; reference at(size_type pos);

Throws: out_of_range if pos >= size().

Returns: operator[](pos).

const charT& front() const; charT& front();

Effects: Equivalent to operator[](0).

const charT& back() const; charT& back();

Effects: Equivalent to operator[](size() - 1).


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