Fixed so it doesn't trim any whitespace when converting, fixed reversed bad_lexical_cast constructor parameters, changed to pass-by-const reference

[SVN r29629]

include/boost/lexical_cast.hpp

@@ -12,7 +12,7 @@
 //        with additional fixes and suggestions from Gennaro Prota,
 //        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
 //        and other Boosters
-// when:  November 2000, March 2003
+// when:  November 2000, March 2003, June 2005
 
 #include <string>
 #include <typeinfo>
@@ -45,9 +45,9 @@ namespace boost
         {
         }
         bad_lexical_cast(
-            const std::type_info &s,
+            const std::type_info &source_type,
-            const std::type_info &t) :
+            const std::type_info &target_type) :
-            source(&s), target(&t)
+            source(&source_type), target(&target_type)
         {
         }
         const std::type_info &source_type() const
@@ -123,6 +123,11 @@ namespace boost
         template<typename Target, typename Source>
         class lexical_stream
         {
+        private:
+            typedef typename widest_char<
+                typename stream_char<Target>::type,
+                typename stream_char<Source>::type>::type char_type;
+
         public:
             lexical_stream()
             {
@@ -148,7 +153,7 @@ namespace boost
             {
                 return !is_pointer<InputStreamable>::value &&
                        stream >> output &&
-                       (stream >> std::ws).eof();
+                       stream.get() == std::char_traits<char_type>::eof();
             }
             bool operator>>(std::string &output)
             {
@@ -166,10 +171,6 @@ namespace boost
             }
             #endif
         private:
-            typedef typename widest_char<
-                typename stream_char<Target>::type,
-                typename stream_char<Source>::type>::type char_type;
-
             #if defined(BOOST_NO_STRINGSTREAM)
             std::strstream stream;
             #elif defined(BOOST_NO_STD_LOCALE)
@@ -180,6 +181,42 @@ namespace boost
         };
     }
 
+    #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+    // call-by-const reference version
+
+    namespace detail
+    {
+        template<class T>
+        struct array_to_pointer_decay
+        {
+            typedef T type;
+        };
+
+        template<class T, size_t N>
+        struct array_to_pointer_decay<T[N]>
+        {
+            typedef const T * type;
+        };
+    }
+
+    template<typename Target, typename Source>
+    Target lexical_cast(const Source &arg)
+    {
+        typedef typename detail::array_to_pointer_decay<Source>::type NewSource;
+
+        detail::lexical_stream<Target, NewSource> interpreter;
+        Target result;
+
+        if(!(interpreter << arg && interpreter >> result))
+            throw_exception(bad_lexical_cast(typeid(NewSource), typeid(Target)));
+        return result;
+    }
+
+    #else
+
+    // call-by-value fallback version (deprecated)
+
     template<typename Target, typename Source>
     Target lexical_cast(Source arg)
     {
@@ -187,12 +224,14 @@ namespace boost
         Target result;
 
         if(!(interpreter << arg && interpreter >> result))
-            throw_exception(bad_lexical_cast(typeid(Target), typeid(Source)));
+            throw_exception(bad_lexical_cast(typeid(Source), typeid(Target)));
         return result;
     }
+
+    #endif
 }
 
-// Copyright Kevlin Henney, 2000-2003. All rights reserved.
+// Copyright Kevlin Henney, 2000-2005. All rights reserved.
 //
 // Distributed under the Boost Software License, Version 1.0. (See
 // accompanying file LICENSE_1_0.txt or copy at
@@ -200,4 +239,3 @@ namespace boost
 
 #undef DISABLE_WIDE_CHAR_SUPPORT
 #endif
-