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Subject: [Bug c++/94376] When nested inside a lambda body, [=] captures by
 const value instead of by value
Date: Fri, 19 Nov 2021 13:54:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94376

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:fd740165e54151ea794fca34904f5c2e2ea1dcda

commit r12-5403-gfd740165e54151ea794fca34904f5c2e2ea1dcda
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Nov 19 08:54:25 2021 -0500

    c++: nested lambda capturing a capture proxy [PR94376]

    Here when determining the type of the FIELD_DECL for the by-value captu=
re
    of 'i' in the inner lambda, we incorrectly give it the type const int
    instead of int since the effective initializer is the proxy for the out=
er
    capture, and this proxy is const since the outer lambda is non-mutable.

    This patch fixes this by making lambda_capture_field_type handle
    by-value capturing of capture proxies specially, namely we instead
    consider the type of their FIELD_DECL which unlike the proxy has the
    true cv-quals of the captured entity.

            PR c++/94376

    gcc/cp/ChangeLog:

            * lambda.c (lambda_capture_field_type): Simplify by handling the
            is_this case first.  When capturing by-value a capture proxy,
            consider the type of the corresponding field instead.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/lambda/lambda-nested9.C: New test.=