Add Endian specific lightweight_test.hpp with new macro BOOST_TEST_MEMCMP_EQ that uses std::memcmp(...)==0 to determine equality. Bitwise equality is the standard we want floating point round trips to be held to, since NaN's are then equal.

include/boost/endian/conversion.hpp

@@ -5,8 +5,8 @@
 //  Distributed under the Boost Software License, Version 1.0.
 //  http://www.boost.org/LICENSE_1_0.txt
 
-#ifndef BOOST_ENDIAN_CONVERTERS_HPP
+#ifndef BOOST_ENDIAN_CONVERSION_HPP
-#define BOOST_ENDIAN_CONVERTERS_HPP
+#define BOOST_ENDIAN_CONVERSION_HPP
 
 #include <boost/config.hpp>
 #include <boost/predef/detail/endian_compat.h>
@@ -505,4 +505,4 @@ namespace endian
 }  // namespace endian
 }  // namespace boost
 
-#endif // BOOST_ENDIAN_CONVERTERS_HPP
+#endif // BOOST_ENDIAN_CONVERSION_HPP

include/boost/endian/detail/lightweight_test.hpp

@@ -0,0 +1,199 @@
+// boost/endian/detail/lightweight_test.hpp --------------------------------------------//
+
+#ifndef BOOST_ENDIAN_LIGHTWEIGHT_TEST_HPP
+#define BOOST_ENDIAN_LIGHTWEIGHT_TEST_HPP
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+//
+//  Copyright (c) 2002, 2009, 2014 Peter Dimov
+//  Copyright (2) Beman Dawes 2010, 2011
+//  Copyright (3) Ion Gaztanaga 2013
+//
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+//
+
+#include <boost/assert.hpp>
+#include <boost/current_function.hpp>
+#include <boost/core/no_exceptions_support.hpp>
+#include <cstring>    // for memcmp
+#include <iostream>
+
+//  IDE's like Visual Studio perform better if output goes to std::cout or
+//  some other stream, so allow user to configure output stream:
+#ifndef BOOST_LIGHTWEIGHT_TEST_OSTREAM
+# define BOOST_LIGHTWEIGHT_TEST_OSTREAM std::cerr
+#endif
+
+namespace boost
+{
+namespace endian
+{
+namespace detail
+{
+
+struct report_errors_reminder
+{
+    bool called_report_errors_function;
+
+    report_errors_reminder() : called_report_errors_function(false) {}
+
+    ~report_errors_reminder()
+    {
+        BOOST_ASSERT(called_report_errors_function);  // verify report_errors() was called  
+    }
+};
+
+inline report_errors_reminder& report_errors_remind()
+{
+    static report_errors_reminder r;
+    return r;
+}
+
+inline int & test_errors()
+{
+    static int x = 0;
+    report_errors_remind();
+    return x;
+}
+
+inline void test_failed_impl(char const * expr, char const * file, int line, char const * function)
+{
+    BOOST_LIGHTWEIGHT_TEST_OSTREAM
+      << file << "(" << line << "): test '" << expr << "' failed in function '"
+      << function << "'" << std::endl;
+    ++test_errors();
+}
+
+inline void error_impl(char const * msg, char const * file, int line, char const * function)
+{
+    BOOST_LIGHTWEIGHT_TEST_OSTREAM
+      << file << "(" << line << "): " << msg << " in function '"
+      << function << "'" << std::endl;
+    ++test_errors();
+}
+
+inline void throw_failed_impl(char const * excep, char const * file, int line, char const * function)
+{
+   BOOST_LIGHTWEIGHT_TEST_OSTREAM
+    << file << "(" << line << "): Exception '" << excep << "' not thrown in function '"
+    << function << "'" << std::endl;
+   ++test_errors();
+}
+
+template<class T, class U> inline void test_eq_impl( char const * expr1, char const * expr2,
+  char const * file, int line, char const * function, T const & t, U const & u )
+{
+    if( t == u )
+    {
+        report_errors_remind();
+    }
+    else
+    {
+        BOOST_LIGHTWEIGHT_TEST_OSTREAM
+            << file << "(" << line << "): test '" << expr1 << " == " << expr2
+            << "' failed in function '" << function << "': "
+            << "'" << t << "' != '" << u << "'" << std::endl;
+        ++test_errors();
+    }
+}
+
+template<class T, class U> inline void test_ne_impl( char const * expr1, char const * expr2,
+  char const * file, int line, char const * function, T const & t, U const & u )
+{
+    if( t != u )
+    {
+        report_errors_remind();
+    }
+    else
+    {
+        BOOST_LIGHTWEIGHT_TEST_OSTREAM
+            << file << "(" << line << "): test '" << expr1 << " != " << expr2
+            << "' failed in function '" << function << "': "
+            << "'" << t << "' == '" << u << "'" << std::endl;
+        ++test_errors();
+    }
+}
+
+template<class T, class U> inline void test_memcmp_eq_impl(char const * expr1,
+  char const * expr2, char const * file, int line, char const * function, T const & t,
+  U const & u)
+{
+  if (sizeof(T) == sizeof(U)
+    && std::memcmp(&t, &u, sizeof(T)) == 0)
+  {
+    report_errors_remind();
+  }
+  else
+  {
+    BOOST_LIGHTWEIGHT_TEST_OSTREAM
+      << file << "(" << line << "): test 'std::memcmp(" << expr1 << ", " << expr2
+      << ") == 0' fails in function '" << function << "': "
+      << " with values '" << t << "' and '" << u << "'" << std::endl;
+    ++test_errors();
+  }
+}
+
+} // namespace detail
+
+inline int report_errors()
+{
+    boost::endian::detail::report_errors_remind().called_report_errors_function = true;
+
+    int errors = boost::endian::detail::test_errors();
+
+    if( errors == 0 )
+    {
+        BOOST_LIGHTWEIGHT_TEST_OSTREAM
+          << "No errors detected." << std::endl;
+        return 0;
+    }
+    else
+    {
+        BOOST_LIGHTWEIGHT_TEST_OSTREAM
+          << errors << " error" << (errors == 1? "": "s") << " detected." << std::endl;
+        return 1;
+    }
+}
+
+} // namespace endian
+} // namespace boost
+
+#define BOOST_TEST(expr) \
+  ((expr)? (void)0: ::boost::endian::detail::test_failed_impl(#expr, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION))
+
+#define BOOST_ERROR(msg) \
+  ( ::boost::endian::detail::error_impl(msg, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION) )
+
+#define BOOST_TEST_EQ(expr1,expr2) \
+  ( ::boost::endian::detail::test_eq_impl(#expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2) )
+#define BOOST_TEST_NE(expr1,expr2) \
+  ( ::boost::endian::detail::test_ne_impl(#expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2) )
+
+#define BOOST_TEST_MEMCMP_EQ(expr1,expr2) \
+  (::boost::endian::detail::test_memcmp_eq_impl(#expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2))
+
+#ifndef BOOST_NO_EXCEPTIONS
+   #define BOOST_TEST_THROWS( EXPR, EXCEP )                    \
+      try {                                                    \
+         EXPR;                                                 \
+         ::boost::detail::throw_failed_impl                    \
+         (#EXCEP, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
+      }                                                        \
+      catch(EXCEP const&) {                                    \
+      }                                                        \
+      catch(...) {                                             \
+         ::boost::detail::throw_failed_impl                    \
+         (#EXCEP, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION); \
+      }                                                        \
+   //
+#else
+   #define BOOST_TEST_THROWS( EXPR, EXCEP )
+#endif
+
+#endif // #ifndef BOOST_ENDIAN_LIGHTWEIGHT_TEST_HPP

test/buffer_test.cpp

@@ -14,7 +14,7 @@
 //#define BOOST_ENDIAN_LOG
 #include <boost/endian/buffers.hpp>
 #include <boost/detail/lightweight_main.hpp>
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 #include <iostream>
 #include <sstream>
 

test/conversion_test.cpp

@@ -11,7 +11,7 @@
 
 #include <boost/endian/conversion.hpp>
 #include <boost/detail/lightweight_main.hpp>
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 #include <iostream>
 #include <cstring>
 

test/deprecated_test.cpp

@@ -14,7 +14,7 @@
 #define BOOST_ENDIAN_DEPRECATED_NAMES
 #include <boost/endian/endian.hpp>
 #include <boost/detail/lightweight_main.hpp>
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/core/lightweight_test.hpp>
 #include <iostream>
 #include <sstream>
 

test/float_test.cpp

@@ -12,9 +12,9 @@
 #include <boost/endian/detail/disable_warnings.hpp>
 
 //#define BOOST_ENDIAN_LOG
-#include <boost/endian/buffers.hpp>
+#include <boost/endian/conversion.hpp>
 #include <boost/detail/lightweight_main.hpp>
-#include <boost/detail/lightweight_test.hpp>
+#include <boost/endian/detail/lightweight_test.hpp>
 #include <iostream>
 #include <sstream>
 
@@ -23,6 +23,7 @@ using std::cout;
 using std::endl;
 using std::numeric_limits;
 
+
 namespace
 {
   template <class T>
@@ -62,6 +63,30 @@ namespace
     cout << "  denorm_min() " << numeric_limits<T>::denorm_min() << "\n";
   }
 
+  template <class T>
+  void round_trip_test(const char* type)
+  {
+    BOOST_TEST_MEMCMP_EQ(static_cast<T>(1.0), static_cast<T>(1.0));  // reality check
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::min())),
+      numeric_limits<T>::min());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::max())),
+      numeric_limits<T>::max());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::lowest())),
+      numeric_limits<T>::lowest());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::epsilon())),
+      numeric_limits<T>::epsilon());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::round_error())),
+      numeric_limits<T>::round_error());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::infinity())),
+      numeric_limits<T>::infinity());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::quiet_NaN())),
+      numeric_limits<T>::quiet_NaN());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::signaling_NaN())),
+      numeric_limits<T>::signaling_NaN());
+    BOOST_TEST_MEMCMP_EQ(endian_reverse(endian_reverse(numeric_limits<T>::denorm_min())),
+      numeric_limits<T>::denorm_min());
+  }
+
 }  // unnamed namespace
 
 //--------------------------------------------------------------------------------------//
@@ -70,12 +95,22 @@ int cpp_main(int, char *[])
 {
   cout << "byte swap intrinsics: " BOOST_ENDIAN_INTRINSIC_MSG << endl;
 
+//#define BOOST_ENDIAN_FORCE_ERROR
+#ifdef BOOST_ENDIAN_FORCE_ERROR
+  BOOST_TEST_MEMCMP_EQ(1.0f, 1.0);
+  BOOST_TEST_MEMCMP_EQ(1.0f, 1.1f);
+  BOOST_TEST_MEMCMP_EQ(1.0, 1.1);
+#endif
+
   report_limits<float>("float");
+  round_trip_test<float>("float");
+
   report_limits<double>("double");
+  round_trip_test<double>("double");
 
   cout << "\n  done" << endl;
 
-  return ::boost::report_errors();
+  return ::boost::endian::report_errors();
 }
 
 #include <boost/endian/detail/disable_warnings_pop.hpp>

test/msvc/common.props

@@ -10,7 +10,7 @@
     <ClCompile>
       <AdditionalIncludeDirectories>..\..\..\..\..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <WarningLevel>EnableAllWarnings</WarningLevel>
-      <PreprocessorDefinitions>BOOST_ALL_DYN_LINK;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>BOOST_LIGHTWEIGHT_TEST_OSTREAM=std::cout;BOOST_ALL_DYN_LINK;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <PostBuildEvent>
       <Message>Executing test $(TargetName).exe...</Message>