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| author | Jason Merrill <jason@redhat.com> | 2022-04-21 17:24:07 -0400 |
|---|---|---|
| committer | Jason Merrill <jason@redhat.com> | 2022-04-25 23:54:02 -0400 |
| commit | 65735d21ac410463126114c572999682f987972c (patch) | |
| tree | 44f743f3468b3ce2611a1c6c52181b3cf7b86bd2 | |
| parent | c83b9c54d9dee2dce5d8268472a745b013d166cc (diff) | |
| download | gcc-65735d21ac410463126114c572999682f987972c.zip gcc-65735d21ac410463126114c572999682f987972c.tar.gz gcc-65735d21ac410463126114c572999682f987972c.tar.bz2 | |
c++: generic lambda fn parm pack [PR104624]
Parameter packs from the enclosing context can be used unexpanded in a
lambda that is itself part of a pack expansion, but not packs that are part
of the lambda itself. We already check for capture packs; we also need to
check for function parameter packs of the lambda call operator.
PR c++/104624
gcc/cp/ChangeLog:
* pt.cc (check_for_bare_parameter_packs): Check for lambda
function parameter pack.
gcc/testsuite/ChangeLog:
* g++.dg/cpp1y/lambda-generic-variadic22.C: New test.
| -rw-r--r-- | gcc/cp/pt.cc | 4 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic22.C | 15 |
2 files changed, 18 insertions, 1 deletions
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index 7dd9e67..a77b316 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -4341,7 +4341,9 @@ check_for_bare_parameter_packs (tree t, location_t loc /* = UNKNOWN_LOCATION */) parameter_packs = TREE_CHAIN (parameter_packs)) { tree pack = TREE_VALUE (parameter_packs); - if (is_capture_proxy (pack)) + if (is_capture_proxy (pack) + || (TREE_CODE (pack) == PARM_DECL + && DECL_CONTEXT (DECL_CONTEXT (pack)) == lam)) break; } diff --git a/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic22.C b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic22.C new file mode 100644 index 0000000..670c598 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic22.C @@ -0,0 +1,15 @@ +// PR c++/104624 +// { dg-do compile { target c++14 } } + +template <typename T> +auto f (T) +{ + auto a = [](auto ... i) // { dg-prune-output "incomplete type" } + { + int x[][i] = { 0 }; // { dg-error "not expanded" } + }(); +} +void g () +{ + f(0); +} |