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Leonov Artur (Depish)
2025-10-25 03:02:53 +03:00
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[over.call]
# 12 Overloading [[over]](./#over)
## 12.4 Overloaded operators [[over.oper]](over.oper#over.call)
### 12.4.4 Function call [over.call]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/overloading.tex#L3622)
A [*function call operator function*](#def:operator_function,function_call "12.4.4 Function call [over.call]") is a function named operator() that is a member function 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 )
where the [*postfix-expression*](expr.post.general#nt:postfix-expression "7.6.1.1 General [expr.post.general]") is of class type,
the operator function
is selected by overload resolution ([[over.call.object]](over.call.object "12.2.2.2.3 Call to object of class type"))[.](#1.sentence-3)
If a surrogate call function is selected,
let e be the result of invoking the corresponding conversion operator function on the [*postfix-expression*](expr.post.general#nt:postfix-expression "7.6.1.1 General [expr.post.general]");
the expression is interpreted as
e ( [*expression-list*](expr.post.general#nt:expression-list "7.6.1.1 General [expr.post.general]")opt )
Otherwise, 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 )