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From: "spe56nw9 at vivid dot ocn.ne.jp" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/53721] New: "this" not allowed in trailing return type
Date: Tue, 19 Jun 2012 03:45:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D53721

             Bug #: 53721
           Summary: "this" not allowed in trailing return type
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: spe56nw9@vivid.ocn.ne.jp


gcc 4.7.0 outputs following errors when "this" pointer used in trailing ret=
urn
type:
error: invalid use of incomplete type 'struct A'
error: forward declaration of 'struct A'
error: invalid use of incomplete type 'struct A'
error: forward declaration of 'struct A'

However, according to [expr.prim.general]=C2=A75.1.1 clause 3 it should be =
valid
because it appears after the "cv-qualifier-seq".

Code Example:

struct A
{
    void f() {};
    auto g() -> decltype(this->f())
    {

    }

};

Possible duplicate of Bug 52869, however that is about noexcept clauses.