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| author | Patrick Palka <ppalka@redhat.com> | 2021-07-16 16:21:13 -0400 |
|---|---|---|
| committer | Patrick Palka <ppalka@redhat.com> | 2021-07-16 16:21:13 -0400 |
| commit | a8b3861496bffae8b813ea196c1c5b27f79fbe69 (patch) | |
| tree | 5c72154a35c56087ea848454c431ebf83b23a335 | |
| parent | d04b0c75794545f1f7a942764285e21eaf2915a1 (diff) | |
| download | gcc-a8b3861496bffae8b813ea196c1c5b27f79fbe69.zip gcc-a8b3861496bffae8b813ea196c1c5b27f79fbe69.tar.gz gcc-a8b3861496bffae8b813ea196c1c5b27f79fbe69.tar.bz2 | |
c++: alias CTAD in unevaluated context [PR101233]
This is the alias CTAD version of the CTAD bug PR93248, and the fix is
the same: clear cp_unevaluated_operand so that the entire chain of
DECL_ARGUMENTS gets substituted.
PR c++/101233
gcc/cp/ChangeLog:
* pt.c (alias_ctad_tweaks): Clear cp_unevaluated_operand for
substituting DECL_ARGUMENTS.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/class-deduction-alias10.C: New test.
| -rw-r--r-- | gcc/cp/pt.c | 8 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C | 10 |
2 files changed, 17 insertions, 1 deletions
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index c7bf7d4..94ca3bc 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -29097,7 +29097,13 @@ alias_ctad_tweaks (tree tmpl, tree uguides) /* Substitute the deduced arguments plus the rewritten template parameters into f to get g. This covers the type, copyness, guideness, and explicit-specifier. */ - tree g = tsubst_decl (DECL_TEMPLATE_RESULT (f), targs, complain); + tree g; + { + /* Parms are to have DECL_CHAIN tsubsted, which would be skipped + if cp_unevaluated_operand. */ + cp_evaluated ev; + g = tsubst_decl (DECL_TEMPLATE_RESULT (f), targs, complain); + } if (g == error_mark_node) continue; DECL_USE_TEMPLATE (g) = 0; diff --git a/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C new file mode 100644 index 0000000..a473fff --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp2a/class-deduction-alias10.C @@ -0,0 +1,10 @@ +// PR c++/101233 +// { dg-do compile { target c++20 } } + +template<class T, class U> +struct A { A(T, U); }; + +template<class T, class U> +using B = A<U, T>; + +using type = decltype(B{0, 0}); |