Add graph references

references/igraph-1.0.1/vendor/pcg/pcg-output-32.c

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+/*
+ * PCG Random Number Generation for C.
+ *
+ * Copyright 2014-2019 Melissa O'Neill <oneill@pcg-random.org>,
+ *                     and the PCG Project contributors.
+ *
+ * SPDX-License-Identifier: (Apache-2.0 OR MIT)
+ *
+ * Licensed under the Apache License, Version 2.0 (provided in
+ * LICENSE-APACHE.txt and at http://www.apache.org/licenses/LICENSE-2.0)
+ * or under the MIT license (provided in LICENSE-MIT.txt and at
+ * http://opensource.org/licenses/MIT), at your option. This file may not
+ * be copied, modified, or distributed except according to those terms.
+ *
+ * Distributed on an "AS IS" BASIS, WITHOUT WARRANTY OF ANY KIND, either
+ * express or implied.  See your chosen license for details.
+ *
+ * For additional information about the PCG random number generation scheme,
+ * visit http://www.pcg-random.org/.
+ */
+
+/*
+ * This code is derived from the canonical C++ PCG implementation, which
+ * has many additional features and is preferable if you can use C++ in
+ * your project.
+ *
+ * The contents of this file were mechanically derived from pcg_variants.h
+ * (every inline function defined there gets a generated extern declaration).
+ */
+
+#include "pcg_variants.h"
+
+/*
+ * Rotate helper functions.
+ */
+
+extern inline uint32_t pcg_rotr_32(uint32_t value, unsigned int rot);
+
+/*
+ * Output functions.  These are the core of the PCG generation scheme.
+ */
+
+/* XSH RS */
+
+extern inline uint32_t pcg_output_xsh_rs_64_32(uint64_t state);
+
+/* XSH RR */
+
+extern inline uint32_t pcg_output_xsh_rr_64_32(uint64_t state);
+
+/* RXS M XS */
+
+extern inline uint32_t pcg_output_rxs_m_xs_32_32(uint32_t state);
+
+/* RXS M */
+
+extern inline uint32_t pcg_output_rxs_m_64_32(uint64_t state);
+
+/* XSL RR (only defined for >= 64 bits) */
+
+extern inline uint32_t pcg_output_xsl_rr_64_32(uint64_t state);
+
+/* XSL RR RR (only defined for >= 64 bits) */