Release 1.45.0

[SVN r66646]

cast.htm

@@ -120,10 +120,10 @@ void f( Fruit * fruit ) {
     <p><code>polymorphic_cast</code> was suggested by Bjarne Stroustrup in "The C++
     Programming Language".<br>
      <code>polymorphic_downcast</code> was contributed by <a href=
-    "../../people/dave_abrahams.htm">Dave Abrahams</a>.<code><br>
+    "http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a>.<code><br>
      An old
      numeric_cast</code> that was contributed by <a href=
-    "../../people/kevlin_henney.htm">Kevlin Henney</a> is now superseeded by the <a href="../numeric/conversion/doc/index.html">Boost Numeric Conversion Library</a></p>
+    "http://www.boost.org/people/kevlin_henney.htm">Kevlin Henney</a> is now superseeded by the <a href="../numeric/conversion/doc/html/index.html">Boost Numeric Conversion Library</a></p>
     <hr>
 
     <p>Revised

include/boost/detail/lcast_precision.hpp

@@ -0,0 +1,184 @@
+// Copyright Alexander Nasonov & Paul A. Bristow 2006.
+
+// Use, modification and distribution are subject to the
+// Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+#define BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+
+#include <climits>
+#include <ios>
+#include <limits>
+
+#include <boost/config.hpp>
+#include <boost/integer_traits.hpp>
+
+#ifndef BOOST_NO_IS_ABSTRACT
+// Fix for SF:1358600 - lexical_cast & pure virtual functions & VC 8 STL
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_abstract.hpp>
+#endif
+
+#if defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) || \
+  (defined(BOOST_MSVC) && (BOOST_MSVC<1310))
+
+#define BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+#endif
+
+#ifdef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+#include <boost/assert.hpp>
+#else
+#include <boost/static_assert.hpp>
+#endif
+
+namespace boost { namespace detail {
+
+class lcast_abstract_stub {};
+
+#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+// Calculate an argument to pass to std::ios_base::precision from
+// lexical_cast. See alternative implementation for broken standard
+// libraries in lcast_get_precision below. Keep them in sync, please.
+template<class T>
+struct lcast_precision
+{
+#ifdef BOOST_NO_IS_ABSTRACT
+    typedef std::numeric_limits<T> limits; // No fix for SF:1358600.
+#else
+    typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
+        boost::is_abstract<T>
+      , std::numeric_limits<lcast_abstract_stub>
+      , std::numeric_limits<T>
+      >::type limits;
+#endif
+
+    BOOST_STATIC_CONSTANT(bool, use_default_precision =
+            !limits::is_specialized || limits::is_exact
+        );
+
+    BOOST_STATIC_CONSTANT(bool, is_specialized_bin =
+            !use_default_precision &&
+            limits::radix == 2 && limits::digits > 0
+        );
+
+    BOOST_STATIC_CONSTANT(bool, is_specialized_dec =
+            !use_default_precision &&
+            limits::radix == 10 && limits::digits10 > 0
+        );
+
+    BOOST_STATIC_CONSTANT(std::streamsize, streamsize_max =
+            boost::integer_traits<std::streamsize>::const_max
+        );
+
+    BOOST_STATIC_CONSTANT(unsigned int, precision_dec = limits::digits10 + 1U);
+
+    BOOST_STATIC_ASSERT(!is_specialized_dec ||
+            precision_dec <= streamsize_max + 0UL
+        );
+
+    BOOST_STATIC_CONSTANT(unsigned long, precision_bin =
+            2UL + limits::digits * 30103UL / 100000UL
+        );
+
+    BOOST_STATIC_ASSERT(!is_specialized_bin ||
+            (limits::digits + 0UL < ULONG_MAX / 30103UL &&
+            precision_bin > limits::digits10 + 0UL &&
+            precision_bin <= streamsize_max + 0UL)
+        );
+
+    BOOST_STATIC_CONSTANT(std::streamsize, value =
+            is_specialized_bin ? precision_bin
+                               : is_specialized_dec ? precision_dec : 6
+        );
+};
+#endif
+
+template<class T>
+inline std::streamsize lcast_get_precision(T* = 0)
+{
+#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
+    return lcast_precision<T>::value;
+#else // Follow lcast_precision algorithm at run-time:
+
+#ifdef BOOST_NO_IS_ABSTRACT
+    typedef std::numeric_limits<T> limits; // No fix for SF:1358600.
+#else
+    typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
+        boost::is_abstract<T>
+      , std::numeric_limits<lcast_abstract_stub>
+      , std::numeric_limits<T>
+      >::type limits;
+#endif
+
+    bool const use_default_precision =
+        !limits::is_specialized || limits::is_exact;
+
+    if(!use_default_precision)
+    { // Includes all built-in floating-point types, float, double ...
+      // and UDT types for which digits (significand bits) is defined (not zero)
+
+        bool const is_specialized_bin =
+            limits::radix == 2 && limits::digits > 0;
+        bool const is_specialized_dec =
+            limits::radix == 10 && limits::digits10 > 0;
+        std::streamsize const streamsize_max =
+            (boost::integer_traits<std::streamsize>::max)();
+
+        if(is_specialized_bin)
+        { // Floating-point types with
+          // limits::digits defined by the specialization.
+
+            unsigned long const digits = limits::digits;
+            unsigned long const precision = 2UL + digits * 30103UL / 100000UL;
+            // unsigned long is selected because it is at least 32-bits
+            // and thus ULONG_MAX / 30103UL is big enough for all types.
+            BOOST_ASSERT(
+                    digits < ULONG_MAX / 30103UL &&
+                    precision > limits::digits10 + 0UL &&
+                    precision <= streamsize_max + 0UL
+                );
+            return precision;
+        }
+        else if(is_specialized_dec)
+        {   // Decimal Floating-point type, most likely a User Defined Type
+            // rather than a real floating-point hardware type.
+            unsigned int const precision = limits::digits10 + 1U;
+            BOOST_ASSERT(precision <= streamsize_max + 0UL);
+            return precision;
+        }
+    }
+
+    // Integral type (for which precision has no effect)
+    // or type T for which limits is NOT specialized,
+    // so assume stream precision remains the default 6 decimal digits.
+    // Warning: if your User-defined Floating-point type T is NOT specialized,
+    // then you may lose accuracy by only using 6 decimal digits.
+    // To avoid this, you need to specialize T with either
+    // radix == 2 and digits == the number of significand bits,
+    // OR
+    // radix = 10 and digits10 == the number of decimal digits.
+
+    return 6;
+#endif
+}
+
+template<class T>
+inline void lcast_set_precision(std::ios_base& stream, T*)
+{
+    stream.precision(lcast_get_precision<T>());
+}
+
+template<class Source, class Target>
+inline void lcast_set_precision(std::ios_base& stream, Source*, Target*)
+{
+    std::streamsize const s = lcast_get_precision(static_cast<Source*>(0));
+    std::streamsize const t = lcast_get_precision(static_cast<Target*>(0));
+    stream.precision(s > t ? s : t);
+}
+
+}}
+
+#endif //  BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+

include/boost/implicit_cast.hpp

@@ -23,7 +23,7 @@ inline T implicit_cast (typename mpl::identity<T>::type x) {
 //template <typename T>
 //void implicit_cast (...);
 
-
 } // namespace boost
 
+
 #endif // IMPLICIT_CAST_DWA200356_HPP

lexical_cast.htm

@@ -20,6 +20,10 @@
 				<a href="#lexical_cast"><code>lexical_cast</code></a></li>
 			<li>
 				<a href="#bad_lexical_cast"><code>bad_lexical_cast</code></a></li>
+			<li>
+				<a href="#faq">Frequently Asked Questions</a></li>
+			<li>
+				<a href="#references">References</a></li>
 			<li>
 				<a href="#changes">Changes</a></li>
 		</ul>
@@ -77,7 +81,7 @@
 			conversions, such as where precision or formatting need tighter control than is 
 			offered by the default behavior of <code>lexical_cast</code>, the conventional <code>
 				stringstream</code> approach is recommended. Where the conversions are 
-			numeric to numeric, <code><a href="../numeric/conversion/doc/numeric_cast.html">numeric_cast</a></code>
+			numeric to numeric, <code><a href="../numeric/conversion/doc/html/boost_numericconversion/improved_numeric_cast__.html">numeric_cast</a></code>
 			may offer more reasonable behavior than <code>lexical_cast</code>.
 		<p>
 			For a good discussion of the options and issues involved in string-based 
@@ -160,7 +164,7 @@ void log_errno(int yoko)
 					and an instance of the result type on the right.
 				</li>
 				<li>
-					Both <code>Source</code> and <code>Target</code> are <i>CopyConstructible</i> [20.1.3].
+					<code>Target</code> is <i>CopyConstructible</i> [20.1.3].
 				</li>
 				<li>
 					<code>Target</code> is <i>DefaultConstructible</i>, meaning that it is possible 
@@ -192,7 +196,39 @@ public:
 		failure.
 			<hr>
 		
+<h2><a name="faq">Frequently Asked Questions</h2>
+    <p> Q: Why does <code>lexical_cast&lt;int8_t&gt;("127")</code> throw <code>bad_lexical_cast</code>?
+    <br> A: The type <code>int8_t</code> is a typedef to <code>char</code> or <code>signed char</code>.
+    Lexical conversion to these types is simply reading a byte from source but since the source has
+    more than one byte, the exception is thrown.
+    <p>Please use other integer types such as <code>int</code> or <code>short int</code>. If bounds checking
+    is important, you can also call <a href="../../libs/numeric/conversion/doc/html/boost_numericconversion/improved_numeric_cast__.html">numeric_cast</a>:
+
+<pre><a href="../../libs/numeric/conversion/doc/html/boost_numericconversion/improved_numeric_cast__.html">numeric_cast</a>&lt;int8_t&gt;(lexical_cast&lt;int&gt;("127"));</pre>
+
+    <p> Q: What does <code>lexical_cast&lt;std::string&gt;</code> of an <code>int8_t</code> or <code>uint8_t</code> not do what I expect?
+    <br> A: As above, note that <code>int8_t</code> and <code>uint8_t</code> are actually chars and are formatted as such.  To avoid this, cast to an integer type first:
+
+<pre>lexical_cast&lt;std::string&gt;(static_cast&lt;int&gt;(n));</pre>
+
+    <p> Q: The implementation always resets the <code>ios_base::skipws</code> flag of an underlying stream object. It breaks my <code>operator&gt;&gt;</code> that works only in presence of this flag. Can you remove code that resets the flag?
+    <br> A: May be in a future version. There is no requirement in <a href="#n1973">[N1973]</a> to reset the flag but remember that <a href="#n1973">[N1973]</a> is not yet accepted by the committee. By the way, it's a great opportunity to make your <code>operator&gt;&gt;</code> conform to the standard. Read a good C++ book, study <code>std::sentry</code> and <a href="../../libs/io/doc/ios_state.html">ios_state_saver</a>.
+</ul>
+<h2><a name="references">References</h2>
+<ul type="square">
+    <a name="n1973"></a><li> [N1973] Kevlin Henney, Beman Dawes, Lexical Conversion Library Proposal for TR2,
+      <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1973.html">N1973</a>.
+      <a name="tuning"></a><li> [Tuning] Alexander Nasonov, Fine Tuning for lexical_cast,
+      <a href="http://www.accu.org/var/uploads/journals/overload74.pdf">Overload #74</a>,
+      August 2006.</li>
+</ul>
 <h2><a name="changes">Changes</a></h2>
+<h3>August, October 2006:</h3>
+<ul type="square">
+    <li>Better performance for many combinations of <code>Source</code> and <code>Target</code>
+    types. Refer to <a href="#tuning">[Tuning]</a> for more details.
+  </li>
+</ul>
 <h3>June 2005:</h3>
 <ul type="square">
   <li>Call-by-const reference for the parameters. This requires partial specialization 
@@ -231,4 +267,4 @@ public:
 			
 <div align="right"><small><i>&copy; Copyright Kevlin Henney, 2000&#150;2005</i></small></div>
 	</body>
-</html>
+</html>

lexical_cast_test.cpp

@@ -3,6 +3,7 @@
 //  See http://www.boost.org for most recent version, including documentation.
 //
 //  Copyright Terje Slettebø and Kevlin Henney, 2005.
+//  Copyright Alexander Nasonov, 2006.
 //
 //  Distributed under the Boost
 //  Software License, Version 1.0. (See accompanying file
@@ -20,15 +21,35 @@
 
 #include <boost/lexical_cast.hpp>
 
+#include <boost/cstdint.hpp>
 #include <boost/test/unit_test.hpp>
 #include <boost/test/floating_point_comparison.hpp>
 
-#if defined(BOOST_NO_STRINGSTREAM) || \
-    defined(BOOST_NO_STD_WSTRING) || \
-    defined(BOOST_NO_STD_LOCALE)
-#define DISABLE_WIDE_CHAR_SUPPORT
+#include <string>
+#include <memory>
+
+#if (defined(BOOST_HAS_LONG_LONG) || defined(BOOST_HAS_MS_INT64)) \
+    && !(defined(BOOST_MSVC) && BOOST_MSVC < 1300)
+#define LCAST_TEST_LONGLONG
 #endif
 
+template<class CharT>
+struct my_traits : std::char_traits<CharT>
+{
+};
+
+template<class CharT>
+struct my_allocator : std::allocator<CharT>
+{
+};
+
+// Test all 65536 values if true:
+bool const lcast_test_small_integral_types_completely = false;
+
+// lcast_integral_test_counter: use when testing all values of an integral
+// types is not possible. Max. portable value is 32767.
+int const lcast_integral_test_counter=1000;
+
 using namespace boost;
 
 void test_conversion_to_char();
@@ -44,6 +65,24 @@ void test_conversion_from_wstring();
 void test_conversion_to_wstring();
 void test_bad_lexical_cast();
 void test_no_whitespace_stripping();
+void test_conversion_from_to_short();
+void test_conversion_from_to_ushort();
+void test_conversion_from_to_int();
+void test_conversion_from_to_uint();
+void test_conversion_from_to_long();
+void test_conversion_from_to_ulong();
+void test_conversion_from_to_intmax_t();
+void test_conversion_from_to_uintmax_t();
+#ifdef LCAST_TEST_LONGLONG
+void test_conversion_from_to_longlong();
+void test_conversion_from_to_ulonglong();
+#endif
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+void test_traits();
+void test_wtraits();
+void test_allocator();
+void test_wallocator();
+#endif
 
 unit_test::test_suite *init_unit_test_suite(int, char *[])
 {
@@ -56,14 +95,33 @@ unit_test::test_suite *init_unit_test_suite(int, char *[])
     suite->add(BOOST_TEST_CASE(test_conversion_from_to_wchar_t_alias));
     suite->add(BOOST_TEST_CASE(test_conversion_to_pointer));
     suite->add(BOOST_TEST_CASE(test_conversion_to_string));
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
+#ifndef BOOST_LCAST_NO_WCHAR_T
     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));
     suite->add(BOOST_TEST_CASE(test_conversion_to_wstring));
-    #endif
+#endif
     suite->add(BOOST_TEST_CASE(test_bad_lexical_cast));
     suite->add(BOOST_TEST_CASE(test_no_whitespace_stripping));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_short));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_ushort));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_int));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_uint));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_long));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_ulong));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_intmax_t));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_uintmax_t));
+#ifdef LCAST_TEST_LONGLONG
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_longlong));
+    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_ulonglong));
+#endif
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+    suite->add(BOOST_TEST_CASE(&test_traits));
+    suite->add(BOOST_TEST_CASE(&test_wtraits));
+    suite->add(BOOST_TEST_CASE(&test_allocator));
+    suite->add(BOOST_TEST_CASE(&test_wallocator));
+#endif
+
     return suite;
 }
 
@@ -95,10 +153,15 @@ void test_conversion_to_int()
     BOOST_CHECK_EQUAL(0, lexical_cast<int>('0'));
     BOOST_CHECK_THROW(lexical_cast<int>('A'), bad_lexical_cast);
     BOOST_CHECK_EQUAL(1, lexical_cast<int>(1));
+    BOOST_CHECK_EQUAL(1, lexical_cast<int>(1.0));
+
     BOOST_CHECK_EQUAL(
         (std::numeric_limits<int>::max)(),
         lexical_cast<int>((std::numeric_limits<int>::max)()));
-    BOOST_CHECK_EQUAL(1, lexical_cast<int>(1.0));
+
+    BOOST_CHECK_EQUAL(
+        (std::numeric_limits<int>::min)(),
+        lexical_cast<int>((std::numeric_limits<int>::min)()));
 
     BOOST_CHECK_THROW(lexical_cast<int>(1.23), bad_lexical_cast);
 
@@ -167,6 +230,9 @@ void test_conversion_to_bool()
 
 void test_conversion_to_string()
 {
+    char buf[] = "hello";
+    char* str = buf;
+    BOOST_CHECK_EQUAL(str, lexical_cast<std::string>(str));
     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));
@@ -196,14 +262,14 @@ void test_conversion_from_to_wchar_t_alias()
 void test_conversion_to_pointer()
 {
     BOOST_CHECK_THROW(lexical_cast<char *>("Test"), bad_lexical_cast);
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
+#ifndef BOOST_LCAST_NO_WCHAR_T
     BOOST_CHECK_THROW(lexical_cast<wchar_t *>("Test"), bad_lexical_cast);
-    #endif
+#endif
 }
 
 void test_conversion_from_wchar_t()
 {
-#ifndef DISABLE_WIDE_CHAR_SUPPORT
+#ifndef BOOST_LCAST_NO_WCHAR_T
 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
     BOOST_CHECK_EQUAL(1, lexical_cast<int>(L'1'));
     BOOST_CHECK_THROW(lexical_cast<int>(L'A'), bad_lexical_cast);
@@ -236,9 +302,11 @@ void test_conversion_from_wchar_t()
 
 void test_conversion_to_wchar_t()
 {
-#if !defined(DISABLE_WIDE_CHAR_SUPPORT) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
     BOOST_CHECK_EQUAL(L'1', lexical_cast<wchar_t>(1));
     BOOST_CHECK_EQUAL(L'0', lexical_cast<wchar_t>(0));
+    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), bad_lexical_cast);
     BOOST_CHECK_EQUAL(L'1', lexical_cast<wchar_t>(1.0));
     BOOST_CHECK_EQUAL(L'0', lexical_cast<wchar_t>(0.0));
@@ -256,12 +324,12 @@ void test_conversion_to_wchar_t()
         lexical_cast<wchar_t>(std::wstring(L"")), bad_lexical_cast);
     BOOST_CHECK_THROW(
         lexical_cast<wchar_t>(std::wstring(L"Test")), bad_lexical_cast);
-    #endif
+#endif
 }
 
 void test_conversion_from_wstring()
 {
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
+#ifndef BOOST_LCAST_NO_WCHAR_T
     BOOST_CHECK_EQUAL(123, lexical_cast<int>(std::wstring(L"123")));
     BOOST_CHECK_THROW(
         lexical_cast<int>(std::wstring(L"")), bad_lexical_cast);
@@ -274,12 +342,15 @@ void test_conversion_from_wstring()
         lexical_cast<bool>(std::wstring(L"")), bad_lexical_cast);
     BOOST_CHECK_THROW(
         lexical_cast<bool>(std::wstring(L"Test")), bad_lexical_cast);
-    #endif
+#endif
 }
 
 void test_conversion_to_wstring()
 {
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    wchar_t buf[] = L"hello";
+    wchar_t* str = buf;
+    BOOST_CHECK(str == lexical_cast<std::wstring>(str));
     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));
@@ -288,6 +359,7 @@ void test_conversion_to_wstring()
 #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
     BOOST_CHECK(L"A" == lexical_cast<std::wstring>(L'A'));
     BOOST_CHECK(L" " == lexical_cast<std::wstring>(L' '));
+    BOOST_CHECK(L"A" == lexical_cast<std::wstring>('A'));
 #endif
     BOOST_CHECK(L"Test" == lexical_cast<std::wstring>(L"Test"));
     BOOST_CHECK(L" " == lexical_cast<std::wstring>(L" "));
@@ -295,7 +367,7 @@ void test_conversion_to_wstring()
     BOOST_CHECK(L"Test" == lexical_cast<std::wstring>(std::wstring(L"Test")));
     BOOST_CHECK(L" " == lexical_cast<std::wstring>(std::wstring(L" ")));
     BOOST_CHECK(L"" == lexical_cast<std::wstring>(std::wstring(L"")));
-    #endif
+#endif
 }
 
 void test_bad_lexical_cast()
@@ -318,3 +390,394 @@ void test_no_whitespace_stripping()
     BOOST_CHECK_THROW(lexical_cast<int>(" 123"), bad_lexical_cast);
     BOOST_CHECK_THROW(lexical_cast<int>("123 "), bad_lexical_cast);
 }
+
+// Replace "-,999" with "-999".
+template<class CharT>
+std::basic_string<CharT> to_str_gcc_workaround(std::basic_string<CharT> str)
+{
+    std::locale loc;
+    std::numpunct<CharT> const& np = BOOST_USE_FACET(std::numpunct<CharT>, loc);
+    std::ctype<CharT> const& ct = BOOST_USE_FACET(std::ctype<CharT>, loc);
+
+    if(np.grouping().empty())
+        return str;
+
+    CharT prefix[3] = { ct.widen('-'), np.thousands_sep(), CharT() };
+
+    if(str.find(prefix) != 0)
+        return str;
+
+    prefix[1] = CharT();
+    str.replace(0, 2, prefix);
+    return str;
+}
+
+template<class CharT, class T>
+std::basic_string<CharT> to_str(T t)
+{
+    std::basic_ostringstream<CharT> o;
+    o << t;
+    return to_str_gcc_workaround(o.str());
+}
+
+template<class T, class CharT>
+void test_conversion_from_integral_to_char(CharT zero)
+{
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(0)) == zero + 0);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(1)) == zero + 1);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(2)) == zero + 2);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(3)) == zero + 3);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(4)) == zero + 4);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(5)) == zero + 5);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(6)) == zero + 6);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(7)) == zero + 7);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(8)) == zero + 8);
+    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(9)) == zero + 9);
+
+    BOOST_CHECK_THROW(lexical_cast<CharT>(static_cast<T>(10)), bad_lexical_cast);
+
+    T t = (std::numeric_limits<T>::max)();
+    BOOST_CHECK_THROW(lexical_cast<CharT>(t), bad_lexical_cast);
+}
+
+template<class T>
+void test_conversion_from_integral_to_integral()
+{
+    T t = 0;
+    BOOST_CHECK(lexical_cast<T>(t) == t);
+
+    // Next two variables are used to supress warnings.
+    int st = 32767; unsigned int ut = st;
+    t = st;
+    BOOST_CHECK(lexical_cast<short>(t) == st);
+    BOOST_CHECK(lexical_cast<unsigned short>(t) == ut);
+    BOOST_CHECK(lexical_cast<int>(t) == st);
+    BOOST_CHECK(lexical_cast<unsigned int>(t) == ut);
+    BOOST_CHECK(lexical_cast<long>(t) == st);
+    BOOST_CHECK(lexical_cast<unsigned long>(t) == ut);
+
+    t = (std::numeric_limits<T>::max)();
+    BOOST_CHECK(lexical_cast<T>(t) == t);
+
+    t = (std::numeric_limits<T>::min)();
+    BOOST_CHECK(lexical_cast<T>(t) == t);
+}
+
+template<class T, class CharT>
+void test_conversion_from_integral_to_string(CharT)
+{
+    typedef std::numeric_limits<T> limits;
+    typedef std::basic_string<CharT> string_type;
+
+    T t;
+
+    t = (limits::min)();
+    BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+    t = (limits::max)();
+    BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+    if(limits::digits <= 16 && lcast_test_small_integral_types_completely)
+        // min and max have already been tested.
+        for(t = 1 + (limits::min)(); t != (limits::max)(); ++t)
+            BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
+    else
+    {
+        T const min_val = (limits::min)();
+        T const max_val = (limits::max)();
+        T const half_max_val = max_val / 2;
+        T const cnt = lcast_integral_test_counter; // to supress warnings
+        unsigned int const counter = cnt < half_max_val ? cnt : half_max_val;
+
+        unsigned int i;
+
+        // Test values around min:
+        t = min_val;
+        for(i = 0; i < counter; ++i, ++t)
+            BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+        // Test values around max:
+        t = max_val;
+        for(i = 0; i < counter; ++i, --t)
+            BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+        // Test values around zero:
+        if(limits::is_signed)
+            for(t = -counter; t < static_cast<T>(counter); ++t)
+                BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+        // Test values around 100, 1000, 10000, ...
+        T ten_power = 100;
+        for(int e = 2; e <= limits::digits10; ++e, ten_power *= 10)
+        {
+            // ten_power + 100 probably never overflows
+            for(t = ten_power - 100; t != ten_power + 100; ++t)
+                BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
+        }
+    }
+}
+
+template<class T, class CharT>
+void test_conversion_from_string_to_integral(CharT)
+{
+    typedef std::numeric_limits<T> limits;
+    typedef std::basic_string<CharT> string_type;
+
+    string_type s;
+    string_type const zero = to_str<CharT>(0);
+    string_type const nine = to_str<CharT>(9);
+    T const min_val = (limits::min)();
+    T const max_val = (limits::max)();
+
+    s = to_str<CharT>(min_val);
+    BOOST_CHECK_EQUAL(lexical_cast<T>(s), min_val);
+    if(limits::is_signed)
+    {
+#if defined(BOOST_MSVC) && BOOST_MSVC == 1400
+        // VC++ 8.0 bug, see libs/conversion/test/lexical_cast_vc8_bug_test.cpp
+        if(sizeof(T) < sizeof(boost::intmax_t))
+#endif
+        {
+            BOOST_CHECK_THROW(lexical_cast<T>(s + zero), bad_lexical_cast);
+            BOOST_CHECK_THROW(lexical_cast<T>(s + nine), bad_lexical_cast);
+        }
+    }
+
+    s = to_str<CharT>(max_val);
+    BOOST_CHECK_EQUAL(lexical_cast<T>(s), max_val);
+#if defined(BOOST_MSVC) && BOOST_MSVC == 1400
+    // VC++ 8.0 bug, see libs/conversion/test/lexical_cast_vc8_bug_test.cpp
+    if(sizeof(T) != sizeof(boost::intmax_t))
+#endif
+    {
+        BOOST_CHECK_THROW(lexical_cast<T>(s + zero), bad_lexical_cast);
+        BOOST_CHECK_THROW(lexical_cast<T>(s + nine), bad_lexical_cast);
+    }
+
+    if(limits::digits <= 16 && lcast_test_small_integral_types_completely)
+        // min and max have already been tested.
+        for(T t = 1 + min_val; t != max_val; ++t)
+            BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
+    else
+    {
+        T const half_max_val = max_val / 2;
+        T const cnt = lcast_integral_test_counter; // to supress warnings
+        unsigned int const counter = cnt < half_max_val ? cnt : half_max_val;
+
+        T t;
+        unsigned int i;
+
+        // Test values around min:
+        t = min_val;
+        for(i = 0; i < counter; ++i, ++t)
+            BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
+
+        // Test values around max:
+        t = max_val;
+        for(i = 0; i < counter; ++i, --t)
+            BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
+
+        // Test values around zero:
+        if(limits::is_signed)
+            for(t = -counter; t < static_cast<T>(counter); ++t)
+                BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
+
+        // Test values around 100, 1000, 10000, ...
+        T ten_power = 100;
+        for(int e = 2; e <= limits::digits10; ++e, ten_power *= 10)
+        {
+            // ten_power + 100 probably never overflows
+            for(t = ten_power - 100; t != ten_power + 100; ++t)
+                BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
+        }
+    }
+}
+
+template<class T>
+void test_conversion_from_to_integral_for_locale()
+{
+    test_conversion_from_integral_to_integral<T>();
+    test_conversion_from_integral_to_string<T>('0');
+    test_conversion_from_string_to_integral<T>('0');
+#if !defined(BOOST_LCAST_NO_WCHAR_T)
+    test_conversion_from_integral_to_string<T>(L'0');
+    test_conversion_from_string_to_integral<T>(L'0');
+#endif
+}
+
+struct restore_oldloc
+{
+    std::locale oldloc;
+    ~restore_oldloc() { std::locale::global(oldloc); }
+};
+
+template<class T>
+void test_conversion_from_to_integral()
+{
+    char const zero = '0';
+    signed char const szero = '0';
+    unsigned char const uzero = '0';
+    test_conversion_from_integral_to_char<T>(zero);
+    test_conversion_from_integral_to_char<T>(szero);
+    test_conversion_from_integral_to_char<T>(uzero);
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    wchar_t const wzero = L'0';
+    test_conversion_from_integral_to_char<T>(wzero);
+#endif
+
+    // test_conversion_from_to_integral_for_locale
+
+    typedef std::numpunct<char> numpunct;
+
+    restore_oldloc guard;
+    std::locale const& oldloc = guard.oldloc;
+
+    std::string grouping1 = BOOST_USE_FACET(numpunct, oldloc).grouping();
+    std::string grouping2(grouping1);
+
+    test_conversion_from_to_integral_for_locale<T>();
+
+    try
+    {
+        std::locale newloc("");
+        std::locale::global(newloc);
+
+        grouping2 = BOOST_USE_FACET(numpunct, newloc).grouping();
+    }
+    catch(std::exception const& ex)
+    {
+        std::string msg("Failed to set system locale: ");
+        msg += ex.what();
+        BOOST_TEST_MESSAGE(msg);
+    }
+
+    if(grouping1 != grouping2)
+        test_conversion_from_to_integral_for_locale<T>();
+
+    if(grouping1.empty() && grouping2.empty())
+        BOOST_TEST_MESSAGE("Formatting with thousands_sep has not been tested");
+}
+
+void test_conversion_from_to_short()
+{
+    test_conversion_from_to_integral<short>();
+}
+
+void test_conversion_from_to_ushort()
+{
+    test_conversion_from_to_integral<unsigned short>();
+}
+
+void test_conversion_from_to_int()
+{
+    test_conversion_from_to_integral<int>();
+}
+
+void test_conversion_from_to_uint()
+{
+    test_conversion_from_to_integral<unsigned int>();
+}
+
+void test_conversion_from_to_long()
+{
+    test_conversion_from_to_integral<long>();
+}
+
+void test_conversion_from_to_ulong()
+{
+    test_conversion_from_to_integral<unsigned long>();
+}
+
+void test_conversion_from_to_intmax_t()
+{
+    test_conversion_from_to_integral<boost::intmax_t>();
+}
+
+void test_conversion_from_to_uintmax_t()
+{
+    test_conversion_from_to_integral<boost::uintmax_t>();
+}
+
+#if defined(BOOST_HAS_LONG_LONG)
+
+void test_conversion_from_to_longlong()
+{
+    test_conversion_from_to_integral<boost::long_long_type>();
+}
+
+void test_conversion_from_to_ulonglong()
+{
+    test_conversion_from_to_integral<boost::ulong_long_type>();
+}
+
+#elif defined(LCAST_TEST_LONGLONG)
+
+void test_conversion_from_to_longlong()
+{
+    test_conversion_from_to_integral<__int64>();
+}
+
+void test_conversion_from_to_ulonglong()
+{
+    test_conversion_from_to_integral<unsigned __int64>();
+}
+
+#endif
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+void test_traits()
+{
+    typedef std::basic_string<char, my_traits<char> > my_string;
+
+    my_string const s("s");
+    BOOST_CHECK(boost::lexical_cast<char>(s) == s[0]);
+    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
+    BOOST_CHECK(boost::lexical_cast<my_string>(-1) == "-1");
+}
+
+void test_wtraits()
+{
+    typedef std::basic_string<wchar_t, my_traits<wchar_t> > my_string;
+
+    my_string const s(L"s");
+    BOOST_CHECK(boost::lexical_cast<wchar_t>(s) == s[0]);
+    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
+    //BOOST_CHECK(boost::lexical_cast<my_string>(-1) == L"-1");
+    // Commented out because gcc 3.3 doesn't support this:
+    // basic_ostream<wchar_t, my_traits<wchar_t> > o; o << -1;
+}
+
+void test_allocator()
+{
+    typedef std::basic_string< char
+                             , std::char_traits<char>
+                             , my_allocator<char>
+                             > my_string;
+
+    my_string s("s");
+    BOOST_CHECK(boost::lexical_cast<char>(s) == s[0]);
+    BOOST_CHECK(boost::lexical_cast<std::string>(s) == "s");
+    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
+    BOOST_CHECK(boost::lexical_cast<my_string>(1) == "1");
+    BOOST_CHECK(boost::lexical_cast<my_string>("s") == s);
+    BOOST_CHECK(boost::lexical_cast<my_string>(std::string("s")) == s);
+}
+
+void test_wallocator()
+{
+    typedef std::basic_string< wchar_t
+                             , std::char_traits<wchar_t>
+                             , my_allocator<wchar_t>
+                             > my_string;
+
+    my_string s(L"s");
+    BOOST_CHECK(boost::lexical_cast<wchar_t>(s) == s[0]);
+    BOOST_CHECK(boost::lexical_cast<std::wstring>(s) == L"s");
+    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
+    BOOST_CHECK(boost::lexical_cast<my_string>(1) == L"1");
+    BOOST_CHECK(boost::lexical_cast<my_string>(L"s") == s);
+    BOOST_CHECK(boost::lexical_cast<my_string>(std::wstring(L"s")) == s);
+}
+
+#endif
+

test/Jamfile.v2

@@ -21,6 +21,10 @@ test-suite conversion
     [ run ../cast_test.cpp ]
     [ run ../numeric_cast_test.cpp ]    
     [ run ../lexical_cast_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
+    [ run lexical_cast_loopback_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
+    [ run lexical_cast_abstract_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
+    [ run lexical_cast_noncopyable_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
+    [ run lexical_cast_vc8_bug_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
   ;
 
       

test/lexical_cast_abstract_test.cpp

@@ -0,0 +1,61 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Sergey Shandar 2005, Alexander Nasonov, 2007.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+//
+// Test abstract class. Bug 1358600:
+// http://sf.net/tracker/?func=detail&aid=1358600&group_id=7586&atid=107586
+
+#include <boost/config.hpp>
+
+#if defined(__INTEL_COMPILER)
+#pragma warning(disable: 193 383 488 981 1418 1419)
+#elif defined(BOOST_MSVC)
+#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
+#endif
+
+#include <boost/lexical_cast.hpp>
+#include <boost/test/unit_test.hpp>
+
+using namespace boost;
+
+void test_abstract();
+
+unit_test::test_suite *init_unit_test_suite(int, char *[])
+{
+    unit_test_framework::test_suite *suite =
+        BOOST_TEST_SUITE("lexical_cast unit test");
+    suite->add(BOOST_TEST_CASE(&test_abstract));
+
+    return suite;
+}
+
+class A
+{
+public:
+    virtual void out(std::ostream &) const = 0;
+};
+
+class B: public A
+{
+public:
+    virtual void out(std::ostream &O) const { O << "B"; }
+};
+
+std::ostream &operator<<(std::ostream &O, const A &a)
+{
+    a.out(O);
+    return O;
+};
+
+void test_abstract()
+{
+    const A &a = B();
+    BOOST_CHECK(boost::lexical_cast<std::string>(a) == "B");
+}
+

test/lexical_cast_loopback_test.cpp

@@ -0,0 +1,98 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Alexander Nasonov, 2006.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+//
+//  Test round-tripping conversion FPT -> string -> FPT,
+//  where FPT is Floating Point Type.
+
+#include <boost/config.hpp>
+
+#if defined(__INTEL_COMPILER)
+#pragma warning(disable: 193 383 488 981 1418 1419)
+#elif defined(BOOST_MSVC)
+#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
+#endif
+
+#include <boost/lexical_cast.hpp>
+#include <boost/test/unit_test.hpp>
+
+using namespace boost;
+
+void test_round_conversion_float();
+void test_round_conversion_double();
+void test_round_conversion_long_double();
+
+unit_test::test_suite *init_unit_test_suite(int, char *[])
+{
+    unit_test_framework::test_suite *suite =
+        BOOST_TEST_SUITE("lexical_cast unit test");
+    suite->add(BOOST_TEST_CASE(&test_round_conversion_float));
+    suite->add(BOOST_TEST_CASE(&test_round_conversion_double));
+    suite->add(BOOST_TEST_CASE(&test_round_conversion_long_double));
+
+    return suite;
+}
+
+template<class T>
+void test_round_conversion()
+{
+    T epsilon = std::numeric_limits<T>::epsilon();
+    std::string const epsilon_s = boost::lexical_cast<std::string>(epsilon);
+    BOOST_CHECK(epsilon == lexical_cast<T>(epsilon_s));
+
+    T max_ = (std::numeric_limits<T>::max)();
+    std::string const max_s = boost::lexical_cast<std::string>(max_);
+    BOOST_CHECK(max_ == lexical_cast<T>(max_s));
+
+    T min_ = (std::numeric_limits<T>::min)();
+    std::string const min_s = boost::lexical_cast<std::string>(min_);
+    BOOST_CHECK(min_ == lexical_cast<T>(min_s));
+
+    T max_div137 = max_ / 137;
+    std::string max_div137_s = boost::lexical_cast<std::string>(max_div137);
+    BOOST_CHECK(max_div137 == lexical_cast<T>(max_div137_s));
+
+    T epsilon_mult137 = epsilon * 137;
+    std::string epsilon_mult137_s(lexical_cast<std::string>(epsilon_mult137));
+    BOOST_CHECK(epsilon_mult137 == lexical_cast<T>(epsilon_mult137_s));
+
+}
+
+#if defined(BOOST_MSVC)
+// See bug http://tinyurl.com/vhpvo
+template<class T>
+void test_msvc_magic_values()
+{
+    T magic_msvc = 0.00010000433948393407;
+    std::string magic_msvc_s = boost::lexical_cast<std::string>(magic_msvc);
+    BOOST_CHECK(magic_msvc == lexical_cast<T>(magic_msvc_s));
+}
+#endif
+
+void test_round_conversion_float()
+{
+    test_round_conversion<float>();
+}
+
+void test_round_conversion_double()
+{
+    test_round_conversion<double>();
+#if defined(BOOST_MSVC)
+    test_msvc_magic_values<double>();
+#endif
+}
+
+void test_round_conversion_long_double()
+{
+    test_round_conversion<long double>();
+#if defined(BOOST_MSVC)
+    test_msvc_magic_values<long double>();
+#endif
+}
+

test/lexical_cast_noncopyable_test.cpp

@@ -0,0 +1,54 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Alexander Nasonov, 2007.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+//
+//  Test that Source can be non-copyable.
+
+#include <boost/config.hpp>
+
+#if defined(__INTEL_COMPILER)
+#pragma warning(disable: 193 383 488 981 1418 1419)
+#elif defined(BOOST_MSVC)
+#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
+#endif
+
+#include <boost/lexical_cast.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/test/unit_test.hpp>
+
+using namespace boost;
+
+void test_noncopyable();
+
+unit_test::test_suite *init_unit_test_suite(int, char *[])
+{
+    unit_test_framework::test_suite *suite =
+        BOOST_TEST_SUITE("lexical_cast unit test");
+    suite->add(BOOST_TEST_CASE(&test_noncopyable));
+
+    return suite;
+}
+
+class Noncopyable : private boost::noncopyable
+{
+public:
+    Noncopyable() {}
+};
+
+inline std::ostream &operator<<(std::ostream &out, const Noncopyable&)
+{
+    return out << "Noncopyable";
+}
+
+void test_noncopyable()
+{
+    Noncopyable x;
+    BOOST_CHECK(boost::lexical_cast<std::string>(x) == "Noncopyable");
+}
+

test/lexical_cast_vc8_bug_test.cpp

@@ -0,0 +1,53 @@
+#include <boost/config.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/cstdint.hpp>
+#include <boost/test/unit_test.hpp>
+
+#include <string>
+
+using namespace boost;
+
+// See also test_conversion_from_string_to_integral(CharT)
+// in libs/conversion/lexical_cast_test.cpp
+template<class T, class CharT>
+void test_too_long_number(CharT zero)
+{
+    typedef std::numeric_limits<T> limits;
+
+    std::basic_string<CharT> s;
+
+    std::basic_ostringstream<CharT> o;
+    o << (limits::max)() << zero;
+    s = o.str();
+    BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
+    s[s.size()-1] += 9; // '0' -> '9'
+    BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
+
+    if(limits::is_signed)
+    {
+        std::basic_ostringstream<CharT> o;
+        o << (limits::min)() << zero;
+        s = o.str();
+        BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
+        s[s.size()-1] += 9; // '0' -> '9'
+        BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
+    }
+}
+
+void test_vc8_bug()
+{
+    test_too_long_number<boost::intmax_t>('0');
+    test_too_long_number<boost::uintmax_t>('0');
+#if !defined(BOOST_LCAST_NO_WCHAR_T)
+    test_too_long_number<boost::intmax_t>(L'0');
+    test_too_long_number<boost::uintmax_t>(L'0');
+#endif
+}
+
+unit_test::test_suite *init_unit_test_suite(int, char *[])
+{
+    unit_test_framework::test_suite *suite =
+        BOOST_TEST_SUITE("lexical_cast vc8 bug unit test");
+    suite->add(BOOST_TEST_CASE(test_vc8_bug));
+    return suite;
+}