From e2825ab72984890e0fb658089320b117961c3513 Mon Sep 17 00:00:00 2001
From: Beman Dawes <bdawes@acm.org>
Date: Thu, 13 Mar 2003 17:27:06 +0000
Subject: [PATCH] overloading fix + less permissive wide character support

[SVN r17893]
---
 include/boost/lexical_cast.hpp | 29 +++++++++++++++++++----------
 lexical_cast_test.cpp          | 22 ++++++++++------------
 2 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/include/boost/lexical_cast.hpp b/include/boost/lexical_cast.hpp
index 820e4d1..3a248f1 100644
--- a/include/boost/lexical_cast.hpp
+++ b/include/boost/lexical_cast.hpp
@@ -1,16 +1,16 @@
 #ifndef BOOST_LEXICAL_CAST_INCLUDED
 #define BOOST_LEXICAL_CAST_INCLUDED
 
-// boost lexical_cast.hpp header  --------------------------------------------//
-
-// See http://www.boost.org/libs/conversion for documentation.
+// Boost lexical_cast.hpp header  -------------------------------------------//
+//
+// See http://www.boost.org for most recent version including documentation.
 // See end of this header for rights and permissions.
 //
 // what:  lexical_cast custom keyword cast
 // who:   contributed by Kevlin Henney,
 //        enhanced with contributions from Terje Slettebų,
 //        with additional fixes and suggestions from Gennaro Prota,
-//        Dave Abrahams, Daryle Walker, and other Boosters on the list
+//        Beman Dawes, Dave Abrahams, Daryle Walker, and other Boosters
 // when:  November 2000, March 2003
 
 #include <string>
@@ -25,6 +25,12 @@
 #include <sstream>
 #endif
 
+#if defined(BOOST_NO_STRINGSTREAM) || \
+    defined(BOOST_NO_STD_WSTRING) || \
+    defined(BOOST_NO_INTRINSIC_WCHAR_T)
+#define DISABLE_WIDE_CHAR_SUPPORT
+#endif
+
 namespace boost
 {
     // exception used to indicate runtime lexical_cast failure
@@ -69,7 +75,7 @@ namespace boost
             typedef char type;
         };
 
-        #ifndef BOOST_NO_STRINGSTREAM
+        #ifndef DISABLE_WIDE_CHAR_SUPPORT
         template<>
         struct stream_char<wchar_t>
         {
@@ -88,7 +94,6 @@ namespace boost
             typedef wchar_t type;
         };
 
-        #ifndef BOOST_NO_STD_WSTRING
         template<>
         struct stream_char<std::wstring>
         {
@@ -96,8 +101,6 @@ namespace boost
         };
         #endif
 
-        #endif
-
         template<typename TargetChar, typename SourceChar>
         struct widest_char
         {
@@ -143,11 +146,16 @@ namespace boost
                        stream >> output &&
                        (stream >> std::ws).eof();
             }
-            template<typename Char, typename Traits, typename Allocator>
-            bool operator>>(std::basic_string<Char, Traits, Allocator> &output)
+            bool operator>>(std::string &output)
             {
                 return std::getline(stream, output, char_type()).eof();
             }
+            #ifndef DISABLE_WIDE_CHAR_SUPPORT
+            bool operator>>(std::wstring &output)
+            {
+                return std::getline(stream, output, char_type()).eof();
+            }
+            #endif
         private:
             typedef typename widest_char<
                 typename stream_char<Target>::type,
@@ -181,4 +189,5 @@ namespace boost
 //
 // This software is provided "as is" without express or implied warranty.
 
+#undef DISABLE_WIDE_CHAR_SUPPORT
 #endif
diff --git a/lexical_cast_test.cpp b/lexical_cast_test.cpp
index 1d3c631..8fe79bb 100644
--- a/lexical_cast_test.cpp
+++ b/lexical_cast_test.cpp
@@ -22,11 +22,10 @@
 #include <boost/test/floating_point_comparison.hpp>
 #include <boost/test/included/unit_test_framework.hpp>
 
-// If BOOST_NO_STRINGSTREAM is defined wide character support is unavailable,
-// and all wide character tests are disabled.
-
-#ifdef BOOST_NO_STRINGSTREAM
-#define NO_WIDE_CHAR_SUPPORT
+#if defined(BOOST_NO_STRINGSTREAM) || \
+    defined(BOOST_NO_STD_WSTRING) || \
+    defined(BOOST_NO_INTRINSIC_WCHAR_T)
+#define DISABLE_WIDE_CHAR_SUPPORT
 #endif
 
 using namespace boost;
@@ -52,7 +51,7 @@ unit_test_framework::test_suite *init_unit_test_suite(int, char **)
     suite->add(BOOST_TEST_CASE(test_conversion_to_bool));
     suite->add(BOOST_TEST_CASE(test_conversion_to_pointer));
     suite->add(BOOST_TEST_CASE(test_conversion_to_string));
-    #ifndef NO_WIDE_CHAR_SUPPORT
+    #ifndef DISABLE_WIDE_CHAR_SUPPORT
     suite->add(BOOST_TEST_CASE(test_conversion_from_wchar_t));
     suite->add(BOOST_TEST_CASE(test_conversion_to_wchar_t));
     suite->add(BOOST_TEST_CASE(test_conversion_from_wstring));
@@ -175,7 +174,6 @@ void test_conversion_to_bool()
 
 void test_conversion_to_string()
 {
-    // *** All the following gives compilation error (ambiguity) on MSVC 6
     BOOST_CHECK_EQUAL("A", lexical_cast<std::string>('A'));
     BOOST_CHECK_EQUAL(" ", lexical_cast<std::string>(' '));
     BOOST_CHECK_EQUAL("123", lexical_cast<std::string>(123));
@@ -197,14 +195,14 @@ void test_conversion_to_string()
 void test_conversion_to_pointer()
 {
     BOOST_CHECK_THROW(lexical_cast<char *>("Test"), boost::bad_lexical_cast);
-    #ifndef NO_WIDE_CHAR_SUPPORT
+    #ifndef DISABLE_WIDE_CHAR_SUPPORT
     BOOST_CHECK_THROW(lexical_cast<wchar_t *>("Test"), boost::bad_lexical_cast);
     #endif
 }
 
 void test_conversion_from_wchar_t()
 {
-    #ifndef NO_WIDE_CHAR_SUPPORT
+    #ifndef DISABLE_WIDE_CHAR_SUPPORT
     BOOST_CHECK_EQUAL(1, lexical_cast<int>(L'1'));
     BOOST_CHECK_THROW(lexical_cast<int>(L'A'), boost::bad_lexical_cast);
 
@@ -241,7 +239,7 @@ void test_conversion_from_wchar_t()
 
 void test_conversion_to_wchar_t()
 {
-    #ifndef NO_WIDE_CHAR_SUPPORT
+    #ifndef DISABLE_WIDE_CHAR_SUPPORT
     BOOST_CHECK_EQUAL(L'1', lexical_cast<wchar_t>(1));
     BOOST_CHECK_EQUAL(L'0', lexical_cast<wchar_t>(0));
     BOOST_CHECK_THROW(lexical_cast<wchar_t>(123), boost::bad_lexical_cast);
@@ -270,7 +268,7 @@ void test_conversion_to_wchar_t()
 
 void test_conversion_from_wstring()
 {
-    #ifndef NO_WIDE_CHAR_SUPPORT
+    #ifndef DISABLE_WIDE_CHAR_SUPPORT
     BOOST_CHECK_EQUAL(123, lexical_cast<int>(std::wstring(L"123")));
     BOOST_CHECK_THROW(
         lexical_cast<int>(std::wstring(L"")), boost::bad_lexical_cast);
@@ -294,7 +292,7 @@ void test_conversion_from_wstring()
 
 void test_conversion_to_wstring()
 {
-    #ifndef NO_WIDE_CHAR_SUPPORT
+    #ifndef DISABLE_WIDE_CHAR_SUPPORT
     BOOST_CHECK(L"123" == lexical_cast<std::wstring>(123));
     BOOST_CHECK(L"1.23" == lexical_cast<std::wstring>(1.23));
     BOOST_CHECK(L"1.111111111" == lexical_cast<std::wstring>(1.111111111));