operator[] shall be a non-static member function with exactly one parameter. It implements the subscripting syntax
postfix-expression [ expr-or-braced-init-list ]
Thus, a subscripting expression x[y] is interpreted as x.operator[](y) for a class object x of type T if T::operator[](T1) exists and if the operator is selected as the best match function by the overload resolution mechanism ([over.match.best]). [ Example:
struct X {
Z operator[](std::initializer_list<int>);
};
X x;
x[{1,2,3}] = 7; int a[10];
a[{1,2,3}] = 7;
— end example ]
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