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PR c++/90227 - error with template parameter packs.

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If require_all_args, we aren't waiting for more args to be deduced later.

	* pt.c (coerce_template_parms): Do add empty pack when
	require_all_args.

From-SVN: r270556
This commit is contained in:
Jason Merrill 2019-04-24 16:37:30 -04:00 committed by Jason Merrill
parent 58990c4d3a
commit fd177738f3
3 changed files with 87 additions and 1 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2019-04-24 Jason Merrill <jason@redhat.com>
PR c++/90227 - error with template parameter packs.
* pt.c (coerce_template_parms): Do add empty pack when
require_all_args.
2019-04-24 Richard Biener <rguenther@suse.de>
* call.c (null_ptr_cst_p): Order checks according to expensiveness.

2
gcc/cp/pt.c
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@ -8477,7 +8477,7 @@ coerce_template_parms (tree parms,
arg = NULL_TREE;
if (template_parameter_pack_p (TREE_VALUE (parm))
&& (arg || !(complain & tf_partial))
&& (arg || require_all_args || !(complain & tf_partial))
&& !(arg && ARGUMENT_PACK_P (arg)))
{
/* Some arguments will be placed in the

80
gcc/testsuite/g++.dg/cpp1y/var-templ62.C Normal file
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@ -0,0 +1,80 @@
// PR c++/90227
// { dg-do compile { target c++14 } }
template <int b> struct c { static constexpr int d = b; typedef c e; };
template <bool, typename a> using f = a;
template <bool g> using h = c<g>;
template <int g> using i = c<g>;
template <typename...> struct ab {};
template <typename... j> struct k { using e = ab<j...>; };
template <typename> struct ad;
template <typename j, typename... l> struct ad<ab<j, l...>> { using e = ab<l...>; };
template <typename> struct ae;
template <typename... m> struct ae<ab<m...>> : i<sizeof...(m)> {};
template <typename af, int, int = ae<af>::d> struct ag;
template <typename... m> struct ag<ab<m...>, 0, 0> { using e = ab<>; };
template <typename... m, int ah>
struct ag<ab<m...>, 0, ah> : k<typename ag<typename ad<ab<m...>>::e, ah - 1>::e> {};
template <typename... m, int ai, int ah>
struct ag<ab<m...>, ai, ah> : ag<typename ad<ab<m...>>::e, ai - 1> {};
template <typename, template <typename> class> struct aj;
template <typename... j, template <typename> class ak> struct aj<ab<j...>, ak> {
using e = ab<typename ak<j>::e...>;
};
template <unsigned long> struct an;
struct ao { typedef an<0> ap; };
template <typename a, a...> struct aq {};
template <typename, typename = ao::ap> struct as;
template <typename a, unsigned long... at> struct as<a, an<at...>> { typedef aq<a> ap; };
template <typename a, a> using au = typename as<a>::ap;
template <long... at> using av = aq<unsigned long, at...>;
template <long ar> using aw = au<unsigned long, ar>;
struct ay { using e = h<c<false>::d>; };
template <typename, template <typename> class, typename...>
struct bb : ay::e {};
struct bd { using e = av<>; };
struct bg { using e = bd::e; };
namespace bi {
enum bj { bk };
struct bo { enum n { bp }; };
struct bq { bool br; static const bo::n bs = bo::bp; };
template <typename bv> struct bw { using e = bv; };
template <typename, bj, int, typename...> class bx;
template <typename bv, bj by, int bz, typename... j, long... anchors>
struct bx<bv, by, bz, ab<j...>, av<anchors...>> : bo {
static const n bs = bv::bs;
static const long ca = sizeof bv::br;
using cb = int;
using cc = ab<j...>;
using cd = typename ag<cc, bz>::e;
using ce = typename ag<cc, bz>::e;
using cf = aw<ca>;
using cg = typename bw<bv>::e;
using ch = decltype(cg()(cb(), cd(), ce(), cf()));
};
class ck;
template <typename> struct cl : c<false> {};
template <typename bv, bj by, int bz, typename... j>
struct bx<bv, by, bz, ab<j...>> : public bx<bv, by, bz, typename aj<ab<j...>, cl>::e, bg::e> {};
}
using bi::bj;
using bi::ck;
template <typename cn> class co {
template <typename p> co(p) { c<cn::bs>(); }
static co o;
};
namespace bi {
template <typename> class cp;
template <typename j> using cq = bb<j, cp>;
template <typename, typename cr> void cs(cr, f<cq<cr>::d, void *> = nullptr);
}
using bi::cs;
struct cu : bi::bq {
template <typename... cw, typename... cx>
auto operator()(int q, ab<cw...>, ab<cx...>, av<>) {
cs<cw...>(q);
}
};
template <>
co<bi::bx<cu, bj::bk, 1, ab<int, ck>>>
co<bi::bx<cu, bj::bk, 1, ab<int, ck>>>::o(0);