use sha256 based splittable rng

lib/lattice/rng/show.h

@@ -0,0 +1,110 @@
+// vim: set ts=2 sw=2 expandtab:
+
+// Copyright (c) 2014 Luchang Jin
+// All rights reserved.
+
+// 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/>.
+
+#pragma once
+
+#include <sstream>
+#include <string>
+#include <cstdarg>
+#include <cstring>
+#include <cstdlib>
+#include <cstdio>
+#include <sstream>
+
+#ifdef CURRENT_DEFAULT_NAMESPACE_NAME
+namespace CURRENT_DEFAULT_NAMESPACE_NAME {
+#endif
+
+inline std::string vssprintf(const char* fmt, va_list args)
+{
+  std::string str;
+  char* cstr;
+  vasprintf(&cstr, fmt, args);
+  str += std::string(cstr);
+  std::free(cstr);
+  return str;
+}
+
+inline std::string ssprintf(const char* fmt, ...)
+{
+  va_list args;
+  va_start(args, fmt);
+  return vssprintf(fmt, args);
+}
+
+inline std::string show()
+{
+  return "";
+}
+
+inline std::string show(const int& x)
+{
+  return ssprintf("%d", x);
+}
+
+inline std::string show(const unsigned int& x)
+{
+  return ssprintf("%u", x);
+}
+
+inline std::string show(const long& x)
+{
+  return ssprintf("%ld", x);
+}
+
+inline std::string show(const unsigned long& x)
+{
+  return ssprintf("%lu", x);
+}
+
+inline std::string show(const double& x)
+{
+  return ssprintf("%24.17E", x);
+}
+
+inline std::string show(const bool& x)
+{
+  return x ? "true" : "false";
+}
+
+inline std::string show(const std::string& x)
+{
+  std::ostringstream out;
+  out << x;
+  return out.str();
+}
+
+template <class T>
+std::string shows(const T& x)
+{
+  std::ostringstream out;
+  out << x;
+  return out.str();
+}
+
+template <class T>
+T& reads(T& x, const std::string& str)
+{
+  std::istringstream in(str);
+  in >> x;
+  return x;
+}
+
+#ifdef CURRENT_DEFAULT_NAMESPACE_NAME
+}
+#endif