[over.match.ref]

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

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

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

#### 12.2.2.7 Initialization by conversion function for direct reference binding [over.match.ref]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/overloading.tex#L1143)

Under the conditions specified in [[dcl.init.ref]](dcl.init.ref "9.5.4 References"), a reference can be bound directly
to the result of applying a conversion
function to an initializer expression[.](#1.sentence-1)

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

Assuming that “reference to *cv1* T” is the
type of the reference being initialized,
the candidate functions are selected as follows:

- [(1.1)](#1.1)

Let R be a set of types including
  * [(1.1.1)](#1.1.1)

“lvalue reference to *cv2* T2”
(when converting to an lvalue) and

  * [(1.1.2)](#1.1.2)

“*cv2* T2”
and “rvalue reference to *cv2* T2”
(when converting to an rvalue or an lvalue of function type)

for any T2[.](#1.sentence-3)
  The permissible types for non-explicit conversion functions are
the members of R where “*cv1* T” is reference-compatible ([[dcl.init.ref]](dcl.init.ref "9.5.4 References"))
with “*cv2* T2”[.](#1.1.sentence-2)
  For direct-initialization, the permissible types for explicit
conversion functions are the members of R where T2 can be converted to type T with a (possibly trivial) qualification conversion ([[conv.qual]](conv.qual "7.3.6 Qualification conversions"));
otherwise there are none[.](#1.1.sentence-3)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/overloading.tex#L1176)

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

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

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

— *end note*]