add initial files l8

1 files changed, 63 insertions, 0 deletions

diff --git a/labb8/lib/StanfordCPPLib/private/randompatch.h b/labb8/lib/StanfordCPPLib/private/randompatch.h
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+++ b/labb8/lib/StanfordCPPLib/private/randompatch.h
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+/*
+ * File: private/randompatch.h
+ * ---------------------------
+ * This file patches the implementation of the random number library
+ * to avoid some serious bugs in standard implementations of rand,
+ * particularly on Mac OS X.  It also includes a hack to set the
+ * seed from the RANDOM_SEED environment variable, which makes it
+ * possible to produce repeatable figures.
+ */
+
+/*
+ * Implementation notes: rand, srand
+ * ---------------------------------
+ * To ensure that this package works the same way on all platforms,
+ * this file completely reimplements the rand and srand methods.  The
+ * algorithm is a conventional linear congruential generator with the
+ * parameters used in GNU's gclib.  RAND_MAX for this implementation
+ * is 2147483647 (2^31 - 1).
+ */
+
+#define MULTIPLIER 1103515245
+#define OFFSET 12345
+
+static int _seed = 1;
+
+#undef rand
+#define rand() ((_seed = MULTIPLIER * _seed + OFFSET) & 0x7FFFFFFF)
+
+#undef srand
+#define srand(seed) (_seed = int(seed), _seed = (_seed <= 0) ? 1 : _seed)
+
+#undef RAND_MAX
+#define RAND_MAX 2147483647
+
+/*
+ * Implementation notes: Windows patch
+ * -----------------------------------
+ * On some versions of Windows, the time function is too coarse to use
+ * as a random seed.  On those versions, this definition substitutes the
+ * GetTickCount function.
+ */
+
+#if defined (_MSC_VER) && (_MSC_VER >= 1200)
+#  include <windows.h>
+#  define time(dummy) (GetTickCount())
+#endif
+
+#ifdef __APPLE__
+
+#  include <cstdlib>
+
+   static time_t patchedTime(time_t *) {
+      char *str = getenv("RANDOM_SEED");
+      if (str == NULL) {
+         return time(NULL);
+      } else {
+         return atoi(str);
+      }
+   }
+
+#  define time(dummy) patchedTime(dummy)
+
+#endif