[over.match.copy]

# 12 Overloading [[over]](./#over)

## 12.2 Overload resolution [[over.match]](over.match#copy)

### 12.2.2 Candidate functions and argument lists [[over.match.funcs]](over.match.funcs#over.match.copy)

#### 12.2.2.5 Copy-initialization of class by user-defined conversion [over.match.copy]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/overloading.tex#L1059)

Under the conditions specified in [[dcl.init]](dcl.init "9.5 Initializers"), as
part of a copy-initialization of an object of class type, a user-defined
conversion can be invoked to convert an initializer expression to the
type of the object being initialized[.](#1.sentence-1)

Overload resolution is used
to select the user-defined conversion to be invoked[.](#1.sentence-2)

[*Note [1](#note-1)*:

The conversion performed for indirect binding to a reference to a possibly
cv-qualified class type is determined in terms of a corresponding non-reference
copy-initialization[.](#1.sentence-3)

— *end note*]

Assuming that
“*cv1* T” is the type of the object being initialized, withT a class type,
the candidate functions are selected as follows:

- [(1.1)](#1.1)

  The non-explicit constructors ([[class.conv.ctor]](class.conv.ctor "11.4.8.2 Conversion by constructor")) ofT are candidate functions[.](#1.1.sentence-1)

- [(1.2)](#1.2)

  When the type of the initializer expression is a class type
“cv S”,
conversion functions are considered[.](#1.2.sentence-1)
  The permissible types for non-explicit conversion functions areT and any class derived from T[.](#1.2.sentence-2)
  When initializing a temporary object ([[class.mem]](class.mem "11.4 Class members"))
to be bound to the first parameter of a constructor
where the parameter is of type
“reference to *cv2* T”
and the constructor is
called with a single argument in the context of
direct-initialization of an object of type “*cv3* T”,
the permissible types for explicit conversion functions are the same;
otherwise there are none[.](#1.2.sentence-3)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/overloading.tex#L1098)

In both cases, the argument list has one argument, which is the initializer
expression[.](#2.sentence-1)

[*Note [2](#note-2)*:

This argument will be compared against
the first parameter of the constructors and against the
object parameter of the conversion functions[.](#2.sentence-2)

— *end note*]