Split epee/string_tools.h and encapsulate boost::lexical_cast

contrib/epee/include/string_tools_lexical.h

@@ -0,0 +1,91 @@
+// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// * Neither the name of the Andrey N. Sabelnikov nor the
+// names of its contributors may be used to endorse or promote products
+// derived from this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER  BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// 
+
+#ifndef _STRING_TOOLS_LEXICAL_H_
+#define _STRING_TOOLS_LEXICAL_H_
+
+#include "warnings.h"
+#include "storages/parserse_base_utils.h"
+#include <boost/lexical_cast.hpp> // A heavy header, that was extracted from the rest
+
+#ifndef OUT
+	#define OUT
+#endif
+
+namespace epee
+{
+namespace string_tools
+{
+PUSH_WARNINGS
+DISABLE_GCC_WARNING(maybe-uninitialized)
+    template<class XType>
+    inline bool get_xtype_from_string(OUT XType& val, const std::string& str_id)
+    {
+        if (std::is_integral<XType>::value && !std::numeric_limits<XType>::is_signed && !std::is_same<XType, bool>::value)
+        {
+            for (char c : str_id)
+            {
+                if (!epee::misc_utils::parse::isdigit(c))
+                    return false;
+            }
+        }
+
+        try
+        {
+            val = boost::lexical_cast<XType>(str_id);
+            return true;
+        }
+        catch(const std::exception& /*e*/)
+        {
+            //const char* pmsg = e.what();
+            return false;
+        }
+        catch(...)
+        {
+            return false;
+        }
+
+        return true;
+    }
+POP_WARNINGS
+
+    template<class XType>
+    inline bool xtype_to_string(const  XType& val, std::string& str)
+    {
+        try
+        {
+            str = boost::lexical_cast<std::string>(val);
+        }
+        catch(...)
+        {
+            return false;
+        }
+
+        return true;
+    }
+}
+}
+#endif //_STRING_TOOLS_LEXICAL_H_