diff options
| author | Jason Merrill <jason@redhat.com> | 2017-02-22 17:55:26 -0500 |
|---|---|---|
| committer | Jason Merrill <jason@gcc.gnu.org> | 2017-02-22 17:55:26 -0500 |
| commit | 349c635163ea53a276c755a7bbcb278e1eefef3e (patch) | |
| tree | 3e5eabdf13a765f422917148cb31054ea46c23f9 | |
| parent | e40b6fc7a16e78d6c806545dbe64430db003a66a (diff) | |
| download | gcc-349c635163ea53a276c755a7bbcb278e1eefef3e.zip gcc-349c635163ea53a276c755a7bbcb278e1eefef3e.tar.gz gcc-349c635163ea53a276c755a7bbcb278e1eefef3e.tar.bz2 | |
* pt.c (do_class_deduction): Handle 0 argument case.
From-SVN: r245665
| -rw-r--r-- | gcc/cp/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/cp/pt.c | 8 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp1z/class-deduction30.C | 6 |
3 files changed, 18 insertions, 0 deletions
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index e69e2ea..9d6a9a6 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,3 +1,7 @@ +2017-02-22 Jason Merrill <jason@redhat.com> + + * pt.c (do_class_deduction): Handle 0 argument case. + 2017-02-22 Jakub Jelinek <jakub@redhat.com> PR c++/79664 diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index 5b0f62d..17175ba 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -25126,6 +25126,14 @@ do_class_deduction (tree ptype, tree tmpl, tree init, int flags, if (cands == NULL_TREE) { + if (args->length() == 0) + { + /* Try tmpl<>. */ + tree t = lookup_template_class (tmpl, NULL_TREE, NULL_TREE, + NULL_TREE, false, tf_none); + if (t != error_mark_node) + return t; + } error ("cannot deduce template arguments for %qT, as it has " "no deduction guides or user-declared constructors", type); return error_mark_node; diff --git a/gcc/testsuite/g++.dg/cpp1z/class-deduction30.C b/gcc/testsuite/g++.dg/cpp1z/class-deduction30.C new file mode 100644 index 0000000..e182803 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1z/class-deduction30.C @@ -0,0 +1,6 @@ +// { dg-options -std=c++1z } + +template <class T = void> struct A { }; + +A a{}; + |