Hi,
while looking into c++/58102 and DR 1405 I noticed that we don't
implement DR 1453 either, sort of dual issue with volatile instead of
mutable. Tested x86_64-linux.
Thanks,
Paolo.
/cp
2014-09-02 Paolo Carlini paolo.carl...@oracle.com
DR 1453
* class.c (check_field_decls): A class of literal type cannot have
volatile non-static data members and base classes.
(explain_non_literal_class): Update.
/testsuite
2014-09-02 Paolo Carlini paolo.carl...@oracle.com
DR 1453
* g++.dg/cpp0x/constexpr-volatile.C: New.
* g++.dg/ext/is_literal_type2.C: Likewise.
Index: cp/class.c
===
--- cp/class.c (revision 214808)
+++ cp/class.c (working copy)
@@ -3528,9 +3528,11 @@ check_field_decls (tree t, tree *access_decls,
CLASSTYPE_NON_AGGREGATE (t) = 1;
/* If at least one non-static data member is non-literal, the whole
- class becomes non-literal. Note: if the type is incomplete we
-will complain later on. */
- if (COMPLETE_TYPE_P (type) !literal_type_p (type))
+ class becomes non-literal. Per Core/1453, volatile non-static
+data members and base classes are also not allowed.
+Note: if the type is incomplete we will complain later on. */
+ if (COMPLETE_TYPE_P (type)
+ (!literal_type_p (type) || CP_TYPE_VOLATILE_P (type)))
CLASSTYPE_LITERAL_P (t) = false;
/* A standard-layout class is a class that:
@@ -5431,6 +5433,9 @@ explain_non_literal_class (tree t)
if (CLASS_TYPE_P (ftype))
explain_non_literal_class (ftype);
}
+ if (CP_TYPE_VOLATILE_P (ftype))
+ inform (0, non-static data member %q+D has
+ volatile type, field);
}
}
}
Index: testsuite/g++.dg/cpp0x/constexpr-volatile.C
===
--- testsuite/g++.dg/cpp0x/constexpr-volatile.C (revision 0)
+++ testsuite/g++.dg/cpp0x/constexpr-volatile.C (working copy)
@@ -0,0 +1,26 @@
+// DR 1453
+// { dg-do compile { target c++11 } }
+
+struct S {
+ constexpr S() : n{} { }
+ volatile int n;
+};
+
+constexpr S s; // { dg-error literal }
+
+struct Z {
+ volatile int m;
+};
+
+struct T {
+ constexpr T() : n{} { }
+ Z n;
+};
+
+constexpr T t; // { dg-error literal }
+
+struct U : Z {
+ constexpr U() : Z{} { }
+};
+
+constexpr U u; // { dg-error literal }
Index: testsuite/g++.dg/ext/is_literal_type2.C
===
--- testsuite/g++.dg/ext/is_literal_type2.C (revision 0)
+++ testsuite/g++.dg/ext/is_literal_type2.C (working copy)
@@ -0,0 +1,26 @@
+// DR 1453
+// { dg-do compile { target c++11 } }
+
+struct S {
+ constexpr S() : n{} { }
+ volatile int n;
+};
+
+static_assert(!__is_literal_type(S), );
+
+struct Z {
+ volatile int m;
+};
+
+struct T {
+ constexpr T() : n{} { }
+ Z n;
+};
+
+static_assert(!__is_literal_type(T), );
+
+struct U : Z {
+ constexpr U() : Z{} { }
+};
+
+static_assert(!__is_literal_type(U), );
