Initial commit

libs/math/tools/factorial_tables.cpp

@@ -0,0 +1,41 @@
+//  (C) Copyright John Maddock 2007.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/limits.hpp>
+#include <vector>
+#include "mp_t.hpp"
+
+void write_table(unsigned max_exponent)
+{
+   mp_t max = ldexp(mp_t(1), (int)max_exponent);
+
+   std::vector<mp_t> factorials;
+   factorials.push_back(1);
+
+   mp_t f(1);
+   unsigned i = 1;
+
+   while(f < max)
+   {
+      factorials.push_back(f);
+      ++i;
+      f *= i;
+   }
+
+   //
+   // now write out the results to cout:
+   //
+   std::cout << std::scientific << std::setprecision(40);
+   std::cout << "   static const boost::array<T, " << factorials.size() << "> factorials = {\n";
+   for(unsigned j = 0; j < factorials.size(); ++j)
+      std::cout << "      " << factorials[j] << "L,\n";
+   std::cout << "   };\n\n";
+}
+
+
+int main()
+{
+   write_table(16384/*std::numeric_limits<float>::max_exponent*/);
+}