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re PR c++/55220 ([c++11] ICE when doing partial template specialization on variadic template) 

PR c++/55220
	* pt.c (unify): A pack expansion that is not the last template
	argument makes the entire template argument list non-deduced.

From-SVN: r196068
This commit is contained in:
Jason Merrill 2013-02-14 20:27:12 -05:00 committed by Jason Merrill
parent 06449b408e
commit d132b74aba
3 changed files with 37 additions and 0 deletions
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4
gcc/cp/ChangeLog
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@ -1,5 +1,9 @@
2013-02-14 Jason Merrill <jason@redhat.com>
PR c++/55220
* pt.c (unify): A pack expansion that is not the last template
argument makes the entire template argument list non-deduced.
PR c++/56323
* name-lookup.c (do_class_using_decl): Handle typedefs with
inheriting constructors.

8
gcc/cp/pt.c
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@ -16548,6 +16548,14 @@ unify (tree tparms, tree targs, tree parm, tree arg, int strict,
&& PACK_EXPANSION_P (TREE_VEC_ELT (parmvec, len - 1)))
parm_variadic_p = 1;
for (i = 0; i < len - parm_variadic_p; ++i)
/* If the template argument list of P contains a pack
expansion that is not the last template argument, the
entire template argument list is a non-deduced
context. */
if (PACK_EXPANSION_P (TREE_VEC_ELT (parmvec, i)))
return unify_success (explain_p);
if (TREE_VEC_LENGTH (argvec) < len - parm_variadic_p)
return unify_too_few_arguments (explain_p,
TREE_VEC_LENGTH (argvec), len);

25
gcc/testsuite/g++.dg/cpp0x/variadic-nondeduce2.C Normal file
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@ -0,0 +1,25 @@
// PR c++/55220
// { dg-do compile { target c++11 } }
template <typename ...> struct something_like_tuple
{
};
template <typename, typename> struct is_last
{
static const bool value = false;
};
// Head is non-deducible, so this can't work as the user intended
template <typename T, template <typename ...> class Tuple, typename ... Head>
struct is_last<T, Tuple<Head ..., T>>
{
static const bool value = true;
};
#define SA(X) static_assert (X, #X)
typedef something_like_tuple<char, int, float> something_like_tuple_t;
SA ((is_last<float, something_like_tuple_t>::value == false));
SA ((is_last<int, something_like_tuple_t>::value == false));