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2003-07-10 Mark Mitchell <mark@codesourcery.com>
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PR c++/10558
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* parse.y (class_template_ok_as_expr): New variable.
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(template_arg_1): New non-terminal.
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(primary): Issue errors about uses of class templates as
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expressions.
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* g++.dg/parse/template8.C: New test.
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--- gcc/cp/parse.y 10 Jul 2003 12:43:11 -0000 1.284.2.7
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+++ gcc/cp/parse.y 11 Jul 2003 08:39:55 -0000 1.284.2.8
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@@ -53,6 +53,8 @@ extern struct obstack permanent_obstack;
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/* Like YYERROR but do call yyerror. */
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#define YYERROR1 { yyerror ("syntax error"); YYERROR; }
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+static int class_template_ok_as_expr;
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+
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#define OP0(NODE) (TREE_OPERAND (NODE, 0))
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#define OP1(NODE) (TREE_OPERAND (NODE, 1))
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@@ -422,7 +424,7 @@ cp_parse_init ()
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%type template_close_bracket
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%type <ttype> apparent_template_type
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%type <ttype> template_type template_arg_list template_arg_list_opt
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-%type <ttype> template_arg
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+%type <ttype> template_arg template_arg_1
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%type <ttype> condition xcond paren_cond_or_null
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%type <ttype> type_name nested_name_specifier nested_type ptr_to_mem
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%type <ttype> complete_type_name notype_identifier nonnested_type
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@@ -1108,7 +1110,7 @@ template_close_bracket:
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template_arg_list_opt:
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/* empty */
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{ $$ = NULL_TREE; }
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- | template_arg_list
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+ | template_arg_list
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;
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template_arg_list:
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@@ -1119,6 +1121,15 @@ template_arg_list:
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;
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template_arg:
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+ { ++class_template_ok_as_expr; }
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+ template_arg_1
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+ {
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+ --class_template_ok_as_expr;
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+ $$ = $2;
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+ }
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+ ;
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+
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+template_arg_1:
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type_id
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{ $$ = groktypename ($1.t); }
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| PTYPENAME
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@@ -1695,7 +1706,14 @@ primary:
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$$ = $2;
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}
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| overqualified_id %prec HYPERUNARY
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- { $$ = build_offset_ref (OP0 ($$), OP1 ($$)); }
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+ { $$ = build_offset_ref (OP0 ($$), OP1 ($$));
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+ if (!class_template_ok_as_expr
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+ && DECL_CLASS_TEMPLATE_P ($$))
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+ {
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+ error ("invalid use of template `%D'", $$);
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+ $$ = error_mark_node;
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+ }
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+ }
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| overqualified_id '(' nonnull_exprlist ')'
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{ $$ = finish_qualified_call_expr ($1, $3); }
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| overqualified_id LEFT_RIGHT
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--- gcc/testsuite/g++.dg/parse/template8.C 2005-01-27 14:27:08.338732320 +0100
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+++ gcc/testsuite/g++.dg/parse/template8.C 2003-07-16 18:05:35.000000000 +0200
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@@ -0,0 +1,16 @@
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+namespace N
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+{
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+
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+template <typename> struct A
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+{
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+ template <typename T> A(A<T>);
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+};
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+
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+}
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+
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+void foo(N::A<int>);
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+
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+void bar()
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+{
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+ foo(N::A); // { dg-error "" }
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+}
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