[Bug c++/49763] New: [C++0x] A reference is not correctly captured by [=]

["iorate_stage at yahoo dot co.jp" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49763

           Summary: [C++0x] A reference is not correctly captured by [=]
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: iorate_stage@yahoo.co.jp


When a reference to an integral type (e.g. int) is captured by [=] of a lambda
expression, the value of the captured data is not one of the referenced object,
but the address of that.

int main()
{
    int const &i = 42;

    [=] ()
    {
        std::cout << i << '\n';
                  << *(int *)i << '\n';
    } ();
    // 2293396
    // 42
}

When the referenced type is a floating point type, ICE occurs.

int main()
{
    double const &d = 3.14;

    [=] ()
    {
        std::cout << d << '\n';
    } ();
}

-- ***.cpp: In function 'int main()':
-- ***.cpp:***:8: internal compiler error: in convert_move, at expr.c:324
-- Please submit a full bug report,
-- with preprocessed source if appropriate.
-- See <http://gcc.gnu.org/bugs.html> for instructions.

When the referenced type is a class type, or the reference is explictly
captured by name, it works.