1                                                            -*- Autoconf -*-
2
3# Common code for C-like languages (C, C++, Java, etc.)
4
5# Copyright (C) 2012 Free Software Foundation, Inc.
6
7# This program is free software: you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation, either version 3 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program.  If not, see <http://www.gnu.org/licenses/>.
19
20# b4_dollar_dollar_(VALUE, FIELD, DEFAULT-FIELD)
21# ----------------------------------------------
22# If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD",
23# otherwise just VALUE.  Be sure to pass "(VALUE)" is VALUE is a
24# pointer.
25m4_define([b4_dollar_dollar_],
26[m4_if([$2], [[]],
27       [m4_ifval([$3], [($1.$3)],
28                 [$1])],
29       [($1.$2)])])
30
31# b4_dollar_pushdef(VALUE-POINTER, DEFAULT-FIELD, LOCATION)
32# b4_dollar_popdef
33# ---------------------------------------------------------
34# Define b4_dollar_dollar for VALUE and DEFAULT-FIELD,
35# and b4_at_dollar for LOCATION.
36m4_define([b4_dollar_pushdef],
37[m4_pushdef([b4_dollar_dollar],
38            [b4_dollar_dollar_([$1], m4_dquote($][1), [$2])])dnl
39m4_pushdef([b4_at_dollar], [$3])dnl
40])
41m4_define([b4_dollar_popdef],
42[m4_popdef([b4_at_dollar])dnl
43m4_popdef([b4_dollar_dollar])dnl
44])
45