From 314d866dc914e8b69974fa733866478478fcfb8f Mon Sep 17 00:00:00 2001
From: Douglas Gregor <doug.gregor@gmail.com>
Date: Thu, 6 Nov 2003 01:25:30 +0000
Subject: [PATCH] Use GCC aligned attribute to simplify type_with_alignment

[SVN r20690]
---
 .../boost/type_traits/type_with_alignment.hpp | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/boost/type_traits/type_with_alignment.hpp b/include/boost/type_traits/type_with_alignment.hpp
index 213839a..56889e9 100644
--- a/include/boost/type_traits/type_with_alignment.hpp
+++ b/include/boost/type_traits/type_with_alignment.hpp
@@ -141,6 +141,31 @@ class type_with_alignment
     typedef align_t type;
 };
 
+#if defined(__GNUC__)
+namespace align {
+struct __attribute__((__aligned__(2))) a2 {};
+struct __attribute__((__aligned__(4))) a4 {};
+struct __attribute__((__aligned__(8))) a8 {};
+struct __attribute__((__aligned__(16))) a16 {};
+struct __attribute__((__aligned__(32))) a32 {};
+}
+
+template<> class type_with_alignment<1>  { public: typedef char type; };
+template<> class type_with_alignment<2>  { public: typedef align::a2 type; };
+template<> class type_with_alignment<4>  { public: typedef align::a4 type; };
+template<> class type_with_alignment<8>  { public: typedef align::a8 type; };
+template<> class type_with_alignment<16> { public: typedef align::a16 type; };
+template<> class type_with_alignment<32> { public: typedef align::a32 type; };
+
+namespace detail {
+BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a2,true)
+BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a4,true)
+BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a8,true)
+BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a16,true)
+BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,::boost::align::a32,true)
+}
+#endif
+
 #else
 
 //