moved ToString() here from utils.h

diff --git a/ginac/tostring.h b/ginac/tostring.h
new file mode 100644 (file)
index 0000000..c82813b
--- /dev/null
+++ b/ginac/tostring.h
@@ -0,0 +1,56 @@
+/** @file tostring.h
+ *
+ *  Convert object to its string representation (output form). This is an
+ *  internal header file. */
+
+/*
+ *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __GINAC_TOSTRING_H__
+#define __GINAC_TOSTRING_H__
+
+#include "config.h"
+
+#if defined(HAVE_SSTREAM)
+#include <sstream>
+#elif defined(HAVE_STRSTREAM)
+#include <strstream>
+#else
+#error Need either sstream or strstream
+#endif
+
+namespace GiNaC {
+
+// This should be obsoleted once <sstream> is widely deployed.
+template<class T>
+std::string ToString(const T & t)
+{
+#if defined(HAVE_SSTREAM)
+       std::ostringstream buf;
+       buf << t << std::ends;
+       return buf.str();
+#else
+       char buf[256];
+       std::ostrstream(buf,sizeof(buf)) << t << std::ends;
+       return buf;
+#endif
+}
+
+} // namespace GiNaC
+
+#endif // ndef __GINAC_TOSTRING_H__