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cppdraft/over/sub.md

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+[over.sub]
+
+# 12 Overloading [[over]](./#over)
+
+## 12.4 Overloaded operators [[over.oper]](over.oper#over.sub)
+
+### 12.4.5 Subscripting [over.sub]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/overloading.tex#L3650)
+
+A [*subscripting operator function*](#def:operator_function,subscripting "12.4.5 Subscripting [over.sub]") is a member function named operator[] with an arbitrary number of parameters[.](#1.sentence-1)
+
+It may have default arguments[.](#1.sentence-2)
+
+For an expression of the form
+
+[*postfix-expression*](expr.post.general#nt:postfix-expression "7.6.1.1 General [expr.post.general]") [ [*expression-list*](expr.post.general#nt:expression-list "7.6.1.1 General [expr.post.general]")opt ]
+
+the operator function
+is selected by overload resolution ([[over.match.oper]](over.match.oper "12.2.2.3 Operators in expressions"))[.](#1.sentence-3)
+
+If a member function is selected,
+the expression is interpreted as
+
+[*postfix-expression*](expr.post.general#nt:postfix-expression "7.6.1.1 General [expr.post.general]") . operator [] ( [*expression-list*](expr.post.general#nt:expression-list "7.6.1.1 General [expr.post.general]")opt )
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/overloading.tex#L3667)
+
+[*Example [1](#example-1)*: struct X { Z operator[](std::initializer_list<int>);
+ Z operator[](auto...);};
+X x;
+x[{1,2,3}] = 7; // OK, meaning x.operator[]({1,2,3}) x[1,2,3] = 7; // OK, meaning x.operator[](1,2,3)int a[10];
+a[{1,2,3}] = 7; // error: built-in subscript operator a[1,2,3] = 7; // error: built-in subscript operator — *end example*]