Implement WG21 N2672, Initializer List proposed wording

gcc/cp/ChangeLog:
2008-07-02  Jason Merrill  <jason@redhat.com>

Implement WG21 N2672, Initializer List proposed wording
* cp-tree.h (enum cp_tree_index): Add CPTI_INIT_LIST_TYPE.
(struct lang_type_class): Add has_list_ctor bitfield.
(TYPE_HAS_LIST_CTOR): New macro.
(BRACE_ENCLOSED_INITIALIZER_P): Expect init_list_type_node.
(CONSTRUCTOR_IS_DIRECT_INIT): New macro.
(LOOKUP_NO_NARROWING): New macro.
(LOOKUP_NO_COPY_CTOR_CONVERSION): New macro.
* parser.c (cp_parse_braced_list): Split out from...
(cp_parser_initializer_clause): ...here.
(cp_parser_postfix_expression): Build up CONSTRUCTOR for compound 
literal here.
(cp_lexer_next_token_is_not_keyword): New fn.
(cp_parser_parenthesized_expression_list): Handle { }.
(cp_parser_new_expression, cp_parser_new_initializer): Likewise.
(cp_parser_assignment_expression, cp_parser_condition): Likewise.
(cp_parser_jump_statement, cp_parser_simple_declaration): Likewise.
(cp_parser_mem_initializer, cp_parser_init_declarator): Likewise.
(cp_parser_initializer, cp_parser_functional_cast): Likewise.
(cp_parser_omp_for_loop, cp_parser_cache_group): Likewise.
(cp_parser_save_member_function_body): Likewise.
* call.c (conversion_kind): Add ck_list, ck_aggr.
(struct conversion): Add check_narrowing bitfield, conversion list.
(build_list_conv): New fn.
(build_aggr_conv): New fn.
(implicit_conversion): Call them.
(standard_conversion): Set check_narrowing if appropriate.
(add_function_candidate): Handle LOOKUP_NO_COPY_CTOR_CONVERSION.
(build_user_type_conversion_1): When converting from an init list,
we allow additional conversions except when calling a copy ctor.
(convert_like_real): Calling an explicit ctor for an init list is 
ill-formed.  Handle ck_list and ck_addr.  Check narrowing.
(build_new_method_call): If CONSTRUCTOR_IS_DIRECT_INIT is set and
class doesn't have a list ctor, break the {} into a TREE_LIST.
(compare_ics): ck_list is better than other UDCs.
(set_up_extended_ref_temp): Split out from initialize_reference.
(is_std_init_list): New fn.
(is_list_ctor): New fn.
* decl.c (cxx_init_decl_processing): Create init_list_type_node.
(reshape_init_array_1): Pass it to build_constructor.
(reshape_init_class): Ditto.
(initialize_artificial_var): Pass the appropriate type.
(build_aggr_init_full_exprs): Split out from...
(check_initializer): ...here.  Handle new semantics.
(build_init_list_var_init): New subroutine of check_initializer.
(grokdeclarator): Converting constructors can have more than one parm.
(grok_special_member_properties): Set TYPE_HAS_LIST_CTOR.
* init.c (expand_default_init): Only do digest_init for aggregates.
* rtti.c (tinfo_base_init): Pass init_list_type_node to 
build_constructor_from_list.
(generic_initializer, ptr_initializer): Ditto.
(ptm_initializer, class_initializer): Ditto.
(get_pseudo_ti_init): Ditto.
* error.c (dump_type): Handle init_list_type_node.
(maybe_warn_cpp0x): New fn.
(maybe_varn_variadic_templates): Call it.
* cvt.c (ocp_convert): Handle conversion from { }.
* tree.c (build_array_of_n_type): New fn.
* typeck2.c (store_init_value): Use init_list_type_node.
(digest_init): Likewise.
(check_narrowing): New fn.
* semantics.c: (finish_compound_literal): Take CONSTRUCTOR instead 
of vector of constructor elts.  Handle non-aggregate types.  Make
constant literals static.
* pt.c: (tsubst_copy_and_build): Adjust.
(unify): Handle { }.
* name-lookup.c (arg_assoc_type): Handle init_list_type_node.

gcc/ChangeLog:
2008-07-02  Jason Merrill  <jason@redhat.com>

* tree.c (ctor_to_list): New fn.
* tree.h: Declare it.
(CONSTRUCTOR_ELT): New macro.
(CONSTRUCTOR_NELTS): New macro.

libstdc++-v3/ChangeLog:
2008-07-02  Jason Merrill  <jason@redhat.com>

* libsupc++/initializer_list: New file.
* include/bits/stl_map.h (insert(initializer_list)): New method.

From-SVN: r137361

1 files changed, 64 insertions, 0 deletions

diff --git a/libstdc++-v3/libsupc++/initializer_list b/libstdc++-v3/libsupc++/initializer_list
new file mode 100644
index 0000000..1a3cba3
--- /dev/null
+++ b/libstdc++-v3/libsupc++/initializer_list
@@ -0,0 +1,64 @@
+// std::initializer_list support -*- C++ -*-
+
+// Copyright (C) 2008 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2, or (at your option)
+// any later version.
+// 
+// GCC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING.  If not, write to
+// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+// Boston, MA 02110-1301, USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#ifndef __CXX_INITIALIZER_LIST
+#define __CXX_INITIALIZER_LIST
+
+#pragma GCC visibility push(default)
+
+#include <cstddef>
+
+namespace std
+{
+  template<class E>
+  class initializer_list
+  {
+    const E* _array;
+    size_t _len;
+
+    // The compiler can call a private constructor.
+    initializer_list(const E* _a, size_t _l)
+      : _array(_a), _len(_l) { }
+
+  public:
+    initializer_list()
+      : _array(NULL), _len(0) {}
+    
+    size_t size() const		// number of elements
+    { return _len; }
+    const E* begin() const	// first element
+    { return _array; }
+    const E* end() const	// one past the last element
+    { return begin() + size(); }
+  };
+}
+
+#pragma GCC visibility pop
+#endif // __CXX_INITIALIZER_LIST