Issue 090106.1: Support C++0x r-value reference
Background
----------
C++0x adds R-Value references. An article describing these
can be found at http://www.artima.com/cppsource/rvalue.html.
An rvalue reference behaves just like an lvalue reference
except that it can bind to a temporary (an rvalue).
Overview
--------
L-value reference is indicated by a single ampersand: &.
(DW_TAG_reference_type)
R-value reference is indicated by two ampersands: &&.
The R-value reference can be passed into function as non-const
values, thus allowing an object to modify them. This is useful
for creating move semantics, so r-value can be accepted and
returned without calling the copy constructor.
A& ref1 = A(); // Error!
A&& ref2 = A(); // Ok
Both lvalue reference and rvalue reference can participate in
overloading.
Proposed Changes to the DWARF Specification
-------------------------------------------
New DWARF tag:
|DW_TAG_rvalue_reference_type | 0x41 | C++0x R-value reference type |
Allowable attributes: (modeled after DW_TAG_reference_type)
* DW_AT_address_class
* DW_AT_allocated
* DW_AT_associated
* DW_AT_data_location
* DW_AT_name
* DW_AT_sibling
* DW_AT_type
Example
-------
A&& ref2;
<1>< xxx> DW_TAG_class_type
DW_AT_name A
<1>< yyy> DW_TAG_rvalue_reference_type
DW_AT_type <xxx>
<1>< zzz> DW_TAG_variable
DW_AT_name ref2
DW_AT_type <yyy>
---
Accepted Feb 3, 2009. Editor will assign TAG values.
