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c++: decltype of non-dependent call of class type [PR105386]

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We need to pass tf_decltype when instantiating a non-dependent decltype
operand, like tsubst does in the dependent case, so that we don't force
completion of a prvalue operand's class type.

	PR c++/105386

gcc/cp/ChangeLog:

	* semantics.cc (finish_decltype_type): Pass tf_decltype to
	instantiate_non_dependent_expr_sfinae.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/decltype81.C: New test.
This commit is contained in:
Patrick Palka 2022-04-26 10:53:38 -04:00
parent cd4acb8cd9
commit b6a48401da
2 changed files with 16 additions and 1 deletions
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2
gcc/cp/semantics.cc
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@ -11252,7 +11252,7 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
}
else if (processing_template_decl)
{
expr = instantiate_non_dependent_expr_sfinae (expr, complain);
expr = instantiate_non_dependent_expr_sfinae (expr, complain|tf_decltype);
if (expr == error_mark_node)
return error_mark_node;
/* Keep processing_template_decl cleared for the rest of the function

15
gcc/testsuite/g++.dg/cpp0x/decltype81.C Normal file
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@ -0,0 +1,15 @@
// PR c++/105386
// { dg-do compile { target c++11 } }
template<class T> struct NoInst {
static_assert(sizeof(T) == 9999, "NoInst instantiated");
};
template<class T> NoInst<T> f(T);
template<class>
struct A {
using type = decltype(f(0));
};
A<int> a;