diff options
| author | Patrick Palka <ppalka@redhat.com> | 2021-04-14 08:54:30 -0400 |
|---|---|---|
| committer | Patrick Palka <ppalka@redhat.com> | 2021-04-14 08:54:30 -0400 |
| commit | 2ccc05a5141506fde0e20dec702c717fd67bf6ee (patch) | |
| tree | 735c1fd797ead9d0ed3f1580391bb1aa5ffb1d4f /gcc/lra-constraints.c | |
| parent | a5e4abac26b815fe0b0d421930bfdfd2901adfe3 (diff) | |
| download | gcc-2ccc05a5141506fde0e20dec702c717fd67bf6ee.zip gcc-2ccc05a5141506fde0e20dec702c717fd67bf6ee.tar.gz gcc-2ccc05a5141506fde0e20dec702c717fd67bf6ee.tar.bz2 | |
c++: Fix deduction with reference NTTP [PR83476]
In the testcase ref11.C below, during deduction for the call f(a),
uses_deducible_template_parms returns false for the dependent
specialization A<V> because the generic template argument V here is
wrapped in an implicit INDIRECT_REF (formed from template_parm_to_arg).
Since uses_deducible_template_parms returns false, unify_one_argument
exits early without ever attempting to deduce 'n' for 'V'. This patch
fixes this by making deducible_expression look through such implicit
INDIRECT_REFs.
gcc/cp/ChangeLog:
PR c++/83476
PR c++/99885
* pt.c (deducible_expression): Look through implicit
INDIRECT_REFs as well.
gcc/testsuite/ChangeLog:
PR c++/83476
PR c++/99885
* g++.dg/cpp1z/class-deduction85.C: New test.
* g++.dg/template/ref11.C: New test.
Diffstat (limited to 'gcc/lra-constraints.c')
0 files changed, 0 insertions, 0 deletions