output: Add missing chart.h.

Fixes: 29917c4f5908 ("output-item: Collapse the inheritance hierarchy into a single struct.")

diff --git a/src/output/chart.h b/src/output/chart.h
new file mode 100644 (file)
index 0000000..ac0bd37
--- /dev/null
+++ b/src/output/chart.h
@@ -0,0 +1,46 @@
+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2009, 2011 Free Software Foundation, Inc.
+
+   This program 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 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef OUTPUT_CHART_H
+#define OUTPUT_CHART_H 1
+
+/* Charts.
+
+   A chart is abstract.  Every actual chart is a subclass of chart. */
+
+#include <stdbool.h>
+
+/* A chart.
+
+   The members of struct chart should not be accessed directly.  Use one
+   of the accessor functions defined below. */
+struct chart
+  {
+    int ref_cnt;
+    const struct chart_class *class; /* Subclass. */
+    char *title;                /* May be null if there is no title. */
+  };
+
+struct chart *chart_ref (const struct chart *);
+void chart_unref (struct chart *);
+bool chart_is_shared (const struct chart *);
+
+const char *chart_get_title (const struct chart *);
+void chart_set_title (struct chart *, const char *);
+
+void chart_submit (struct chart *);
+
+#endif /* output/chart.h */