Swap include guards to #ifndef (#271)

Compilers implement a multiple-include optimization where they avoid preprocessing an included file if it is "properly guarded". Compilers differ as to what constitutes a "properly guarded" file. In particular, Microsoft Visual Studio does not recognize `#if !defined(GUARD)` for the optimization. This does not affect the correctness of using Fusion on Microsoft Visual Studio, but it will increase the time taken to build any project on this compiler. This commit changes all include guards to use `#ifndef`, but leaves all other `#if !defined` preprocessor directives that are not related to guarding a file. Co-authored-by: IncludeGuardian <[email protected]>
boostorg · Feb 25, 2024 · ce8b031 · ce8b031
1 parent 7d4c03f
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diff --git a/example/extension/detail/advance_impl.hpp b/example/extension/detail/advance_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_ADVANCE_IMPL_20060222_2150)
+#ifndef BOOST_FUSION_ADVANCE_IMPL_20060222_2150
 #define BOOST_FUSION_ADVANCE_IMPL_20060222_2150
 
 namespace example

diff --git a/example/extension/detail/at_impl.hpp b/example/extension/detail/at_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_AT_IMPL_20060223_2017)
+#ifndef BOOST_FUSION_AT_IMPL_20060223_2017
 #define BOOST_FUSION_AT_IMPL_20060223_2017
 
 #include <string>

diff --git a/example/extension/detail/at_key_impl.hpp b/example/extension/detail/at_key_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_AT_KEY_IMPL_20060223_2017)
+#ifndef BOOST_FUSION_AT_KEY_IMPL_20060223_2017
 #define BOOST_FUSION_AT_KEY_IMPL_20060223_2017
 
 #include <string>

diff --git a/example/extension/detail/begin_impl.hpp b/example/extension/detail/begin_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_BEGIN_IMPL_20060222_2042)
+#ifndef BOOST_FUSION_BEGIN_IMPL_20060222_2042
 #define BOOST_FUSION_BEGIN_IMPL_20060222_2042
 
 #include "../example_struct_iterator.hpp"

diff --git a/example/extension/detail/category_of_impl.hpp b/example/extension/detail/category_of_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_CATEGORY_OF_IMPL_20060223_2037)
+#ifndef BOOST_FUSION_CATEGORY_OF_IMPL_20060223_2037
 #define BOOST_FUSION_CATEGORY_OF_IMPL_20060223_2037
 
 #include <boost/fusion/support/category_of.hpp>

diff --git a/example/extension/detail/deref_impl.hpp b/example/extension/detail/deref_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_DEREF_IMPL_20060222_1952)
+#ifndef BOOST_FUSION_DEREF_IMPL_20060222_1952
 #define BOOST_FUSION_DEREF_IMPL_20060222_1952
 
 #include <boost/static_assert.hpp>

diff --git a/example/extension/detail/distance_impl.hpp b/example/extension/detail/distance_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_DISTANCE_IMPL_20060223_0814)
+#ifndef BOOST_FUSION_DISTANCE_IMPL_20060223_0814
 #define BOOST_FUSION_DISTANCE_IMPL_20060223_0814
 
 #include <boost/mpl/minus.hpp>

diff --git a/example/extension/detail/end_impl.hpp b/example/extension/detail/end_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_END_IMPL_20060222_2042)
+#ifndef BOOST_FUSION_END_IMPL_20060222_2042
 #define BOOST_FUSION_END_IMPL_20060222_2042
 
 #include "../example_struct_iterator.hpp"

diff --git a/example/extension/detail/equal_to_impl.hpp b/example/extension/detail/equal_to_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_EQUAL_TO_IMPL_20060223_1941)
+#ifndef BOOST_FUSION_EQUAL_TO_IMPL_20060223_1941
 #define BOOST_FUSION_EQUAL_TO_IMPL_20060223_1941
 
 #include <boost/mpl/equal_to.hpp>

diff --git a/example/extension/detail/has_key_impl.hpp b/example/extension/detail/has_key_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_HAS_KEY_IMPL_20060223_2156)
+#ifndef BOOST_FUSION_HAS_KEY_IMPL_20060223_2156
 #define BOOST_FUSION_HAS_KEY_IMPL_20060223_2156
 
 #include <boost/type_traits/is_same.hpp>

diff --git a/example/extension/detail/is_sequence_impl.hpp b/example/extension/detail/is_sequence_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_IS_SEQUENCE_IMPL_20060228_1946)
+#ifndef BOOST_FUSION_IS_SEQUENCE_IMPL_20060228_1946
 #define BOOST_FUSION_IS_SEQUENCE_IMPL_20060228_1946
 
 #include <boost/mpl/bool.hpp>

diff --git a/example/extension/detail/is_view_impl.hpp b/example/extension/detail/is_view_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_IS_VIEW_IMPL_200604227_2150)
+#ifndef BOOST_FUSION_IS_VIEW_IMPL_200604227_2150
 #define BOOST_FUSION_IS_VIEW_IMPL_200604227_2150
 
 #include <boost/mpl/bool.hpp>

diff --git a/example/extension/detail/next_impl.hpp b/example/extension/detail/next_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_NEXT_IMPL_20060222_1859)
+#ifndef BOOST_FUSION_NEXT_IMPL_20060222_1859
 #define BOOST_FUSION_NEXT_IMPL_20060222_1859
 
 namespace example

diff --git a/example/extension/detail/prior_impl.hpp b/example/extension/detail/prior_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_PRIOR_IMPL_20060222_1944)
+#ifndef BOOST_FUSION_PRIOR_IMPL_20060222_1944
 #define BOOST_FUSION_PRIOR_IMPL_20060222_1944
 
 namespace example

diff --git a/example/extension/detail/size_impl.hpp b/example/extension/detail/size_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_SIZE_IMPL_20060223_2033)
+#ifndef BOOST_FUSION_SIZE_IMPL_20060223_2033
 #define BOOST_FUSION_SIZE_IMPL_20060223_2033
 
 #include <boost/mpl/int.hpp>

diff --git a/example/extension/detail/value_at_impl.hpp b/example/extension/detail/value_at_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_VALUE_AT_IMPL_20060223_2025)
+#ifndef BOOST_FUSION_VALUE_AT_IMPL_20060223_2025
 #define BOOST_FUSION_VALUE_AT_IMPL_20060223_2025
 
 namespace example

diff --git a/example/extension/detail/value_at_key_impl.hpp b/example/extension/detail/value_at_key_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_VALUE_AT_KEY_IMPL_20060223_2025)
+#ifndef BOOST_FUSION_VALUE_AT_KEY_IMPL_20060223_2025
 #define BOOST_FUSION_VALUE_AT_KEY_IMPL_20060223_2025
 
 namespace fields

diff --git a/example/extension/detail/value_of_impl.hpp b/example/extension/detail/value_of_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_VALUE_OF_IMPL_20060223_1905)
+#ifndef BOOST_FUSION_VALUE_OF_IMPL_20060223_1905
 #define BOOST_FUSION_VALUE_OF_IMPL_20060223_1905
 
 #include <string>

diff --git a/example/extension/example_struct.hpp b/example/extension/example_struct.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_EXAMPLE_STRUCT)
+#ifndef BOOST_FUSION_EXAMPLE_STRUCT
 #define BOOST_FUSION_EXAMPLE_STRUCT
 
 #include "./tag_of.hpp"

diff --git a/example/extension/example_struct_iterator.hpp b/example/extension/example_struct_iterator.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_EXAMPLE_STRUCT_ITERATOR)
+#ifndef BOOST_FUSION_EXAMPLE_STRUCT_ITERATOR
 #define BOOST_FUSION_EXAMPLE_STRUCT_ITERATOR
 
 #include <boost/fusion/support/iterator_base.hpp>

diff --git a/example/extension/example_struct_type.hpp b/example/extension/example_struct_type.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_EXAMPLE_STRUCT_TYPE)
+#ifndef BOOST_FUSION_EXAMPLE_STRUCT_TYPE
 #define BOOST_FUSION_EXAMPLE_STRUCT_TYPE
 
 #include <string>

diff --git a/example/extension/tag_of.hpp b/example/extension/tag_of.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_TAG_OF_20060222_2052)
+#ifndef BOOST_FUSION_TAG_OF_20060222_2052
 #define BOOST_FUSION_TAG_OF_20060222_2052
 
 #include <boost/fusion/support/tag_of_fwd.hpp>

diff --git a/include/boost/fusion/adapted.hpp b/include/boost/fusion/adapted.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_ADAPTED_30122005_1420)
+#ifndef BOOST_FUSION_ADAPTED_30122005_1420
 #define BOOST_FUSION_ADAPTED_30122005_1420
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/array.hpp b/include/boost/fusion/adapted/array.hpp
@@ -6,7 +6,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_ARRAY_27122005_1035)
+#ifndef BOOST_FUSION_ARRAY_27122005_1035
 #define BOOST_FUSION_ARRAY_27122005_1035
 
 //For backwards compatibility

diff --git a/include/boost/fusion/adapted/boost_array.hpp b/include/boost/fusion/adapted/boost_array.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_BOOST_ARRAY_27122005_1035)
+#ifndef BOOST_FUSION_BOOST_ARRAY_27122005_1035
 #define BOOST_FUSION_BOOST_ARRAY_27122005_1035
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/array_iterator.hpp b/include/boost/fusion/adapted/boost_array/array_iterator.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_ARRAY_ITERATOR_26122005_2250)
+#ifndef BOOST_FUSION_ARRAY_ITERATOR_26122005_2250
 #define BOOST_FUSION_ARRAY_ITERATOR_26122005_2250
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/detail/at_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/at_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_AT_IMPL_27122005_1241)
+#ifndef BOOST_FUSION_AT_IMPL_27122005_1241
 #define BOOST_FUSION_AT_IMPL_27122005_1241
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/detail/begin_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/begin_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_BEGIN_IMPL_27122005_1117)
+#ifndef BOOST_FUSION_BEGIN_IMPL_27122005_1117
 #define BOOST_FUSION_BEGIN_IMPL_27122005_1117
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/detail/category_of_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/category_of_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_CATEGORY_OF_IMPL_27122005_1044)
+#ifndef BOOST_FUSION_CATEGORY_OF_IMPL_27122005_1044
 #define BOOST_FUSION_CATEGORY_OF_IMPL_27122005_1044
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/detail/end_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/end_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_END_IMPL_27122005_1120)
+#ifndef BOOST_FUSION_END_IMPL_27122005_1120
 #define BOOST_FUSION_END_IMPL_27122005_1120
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/detail/is_sequence_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/is_sequence_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_IS_SEQUENCE_IMPL_27122005_1648)
+#ifndef BOOST_FUSION_IS_SEQUENCE_IMPL_27122005_1648
 #define BOOST_FUSION_IS_SEQUENCE_IMPL_27122005_1648
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/detail/is_view_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/is_view_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_IS_VIEW_IMPL_27042006_2221)
+#ifndef BOOST_FUSION_IS_VIEW_IMPL_27042006_2221
 #define BOOST_FUSION_IS_VIEW_IMPL_27042006_2221
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_array/detail/size_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/size_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_SIZE_IMPL_27122005_1251)
+#ifndef BOOST_FUSION_SIZE_IMPL_27122005_1251
 #define BOOST_FUSION_SIZE_IMPL_27122005_1251
 
 namespace boost { namespace fusion {

diff --git a/include/boost/fusion/adapted/boost_array/detail/value_at_impl.hpp b/include/boost/fusion/adapted/boost_array/detail/value_at_impl.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_VALUE_AT_IMPL_27122005_1256)
+#ifndef BOOST_FUSION_VALUE_AT_IMPL_27122005_1256
 #define BOOST_FUSION_VALUE_AT_IMPL_27122005_1256
 
 namespace boost { namespace fusion {

diff --git a/include/boost/fusion/adapted/boost_array/tag_of.hpp b/include/boost/fusion/adapted/boost_array/tag_of.hpp
@@ -5,7 +5,7 @@
     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)
 ==============================================================================*/
-#if !defined(FUSION_SEQUENCE_TAG_OF_27122005_1030)
+#ifndef FUSION_SEQUENCE_TAG_OF_27122005_1030
 #define FUSION_SEQUENCE_TAG_OF_27122005_1030
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple.hpp b/include/boost/fusion/adapted/boost_tuple.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_BOOST_TUPLE_09272006_0732)
+#ifndef BOOST_FUSION_BOOST_TUPLE_09272006_0732
 #define BOOST_FUSION_BOOST_TUPLE_09272006_0732
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp b/include/boost/fusion/adapted/boost_tuple/boost_tuple_iterator.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(FUSION_BOOST_TUPLE_ITERATOR_09262006_1851)
+#ifndef FUSION_BOOST_TUPLE_ITERATOR_09262006_1851
 #define FUSION_BOOST_TUPLE_ITERATOR_09262006_1851
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple/detail/at_impl.hpp b/include/boost/fusion/adapted/boost_tuple/detail/at_impl.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_AT_IMPL_09262006_1920)
+#ifndef BOOST_FUSION_AT_IMPL_09262006_1920
 #define BOOST_FUSION_AT_IMPL_09262006_1920
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple/detail/begin_impl.hpp b/include/boost/fusion/adapted/boost_tuple/detail/begin_impl.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_BEGIN_IMPL_09272006_0719)
+#ifndef BOOST_FUSION_BEGIN_IMPL_09272006_0719
 #define BOOST_FUSION_BEGIN_IMPL_09272006_0719
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple/detail/build_cons.hpp b/include/boost/fusion/adapted/boost_tuple/detail/build_cons.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_BUILD_CONS_10172012_0130)
+#ifndef BOOST_FUSION_BUILD_CONS_10172012_0130
 #define BOOST_FUSION_BUILD_CONS_10172012_0130
 
 #include <boost/tuple/tuple.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple/detail/category_of_impl.hpp b/include/boost/fusion/adapted/boost_tuple/detail/category_of_impl.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726)
+#ifndef BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726
 #define BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726
 
 namespace boost { namespace fusion 

diff --git a/include/boost/fusion/adapted/boost_tuple/detail/convert_impl.hpp b/include/boost/fusion/adapted/boost_tuple/detail/convert_impl.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_CONVERT_IMPL_10172012_0120)
+#ifndef BOOST_FUSION_CONVERT_IMPL_10172012_0120
 #define BOOST_FUSION_CONVERT_IMPL_10172012_0120
 
 #include <boost/tuple/tuple.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple/detail/end_impl.hpp b/include/boost/fusion/adapted/boost_tuple/detail/end_impl.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_END_IMPL_09272006_0721)
+#ifndef BOOST_FUSION_END_IMPL_09272006_0721
 #define BOOST_FUSION_END_IMPL_09272006_0721
 
 #include <boost/fusion/support/config.hpp>

diff --git a/include/boost/fusion/adapted/boost_tuple/detail/is_sequence_impl.hpp b/include/boost/fusion/adapted/boost_tuple/detail/is_sequence_impl.hpp
@@ -4,7 +4,7 @@
     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)
 ==============================================================================*/
-#if !defined(BOOST_FUSION_IS_SEQUENCE_IMPL_09272006_0726)
+#ifndef BOOST_FUSION_IS_SEQUENCE_IMPL_09272006_0726
 #define BOOST_FUSION_IS_SEQUENCE_IMPL_09272006_0726
 
 #include <boost/fusion/support/config.hpp>