Add graph references

2026-06-28 13:49:01 +01:00
parent 0a9807e448
commit a11edf0c53
2578 changed files with 868045 additions and 0 deletions
@@ -0,0 +1,60 @@
+/*
+   igraph library.
+   Copyright (C) 2006-2012  Gabor Csardi <csardi.gabor@gmail.com>
+   334 Harvard st, Cambridge MA, 02139 USA
+
+   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 2 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, write to the Free Software
+   Foundation, Inc.,  51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301 USA
+
+*/
+
+#include <igraph.h>
+#include "test_utilities.h"
+
+int main(void) {
+
+    igraph_t g;
+
+    /* empty directed graph, zero vertices */
+    igraph_empty(&g, 0, 1);
+    IGRAPH_ASSERT(igraph_vcount(&g) == 0);
+    IGRAPH_ASSERT(igraph_ecount(&g) == 0);
+    igraph_destroy(&g);
+
+    /* empty undirected graph, zero vertices */
+    igraph_empty(&g, 0, 0);
+    IGRAPH_ASSERT(igraph_vcount(&g) == 0);
+    IGRAPH_ASSERT(igraph_ecount(&g) == 0);
+    igraph_destroy(&g);
+
+    /* empty directed graph, 20 vertices */
+    igraph_empty(&g, 20, 1);
+    IGRAPH_ASSERT(igraph_vcount(&g) == 20);
+    IGRAPH_ASSERT(igraph_ecount(&g) == 0);
+    igraph_destroy(&g);
+
+    /* empty undirected graph, 30 vertices */
+    igraph_empty(&g, 30, 0);
+    IGRAPH_ASSERT(igraph_vcount(&g) == 30);
+    IGRAPH_ASSERT(igraph_ecount(&g) == 0);
+    igraph_destroy(&g);
+
+    /* error: negative number of vertices */
+    CHECK_ERROR(igraph_empty(&g, -1, 0), IGRAPH_EINVAL);
+
+    VERIFY_FINALLY_STACK();
+
+    return 0;
+}