Add support for std::get<> to Boost.Array

[SVN r82083]

include/boost/array.hpp

@@ -42,6 +42,7 @@
 #include <cstddef>
 #include <stdexcept>
 #include <boost/assert.hpp>
+#include <boost/static_assert.hpp>
 #include <boost/swap.hpp>
 
 // Handles broken standard libraries better than <iterator>
@@ -438,6 +439,22 @@ namespace boost {
 
 } /* namespace boost */
 
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+//	If we don't have std::array, I'm assuming that we don't have std::get
+namespace std {
+   template <size_t Idx, typename T, size_t N>
+   T &get(boost::array<T,N> &arr) BOOST_NOEXCEPT {
+       BOOST_STATIC_ASSERT_MSG ( Idx < N, "std::get<>(boost::array &) index out of range" );
+       return arr[Idx];
+       }
+    
+   template <size_t Idx, typename T, size_t N>
+   const T &get(const boost::array<T,N> &arr) BOOST_NOEXCEPT {
+       BOOST_STATIC_ASSERT_MSG ( Idx < N, "std::get<>(const boost::array &) index out of range" );
+       return arr[Idx];
+       }
+}
+#endif
 
 #if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)  
 # pragma warning(pop)  

test/Jamfile.v2

@@ -12,5 +12,6 @@ test-suite array :
     [ run array4.cpp ]
     [ run array5.cpp ]
     [ run array6.cpp ]
+    [ run array7.cpp ]
     [ run array_hash.cpp ]
     ;

test/array7.cpp

@@ -0,0 +1,54 @@
+/* tests for using class array<> specialization for size 0
+ * (C) Copyright Alisdair Meredith 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)
+ */
+
+#include <string>
+#include <iostream>
+#include <boost/array.hpp>
+#include <algorithm>
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+#include <array>
+#endif
+
+namespace {
+unsigned int failed_tests = 0;
+
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+void    fail_test( const char * reason ) {
+    ++failed_tests;
+    std::cerr << "Test failure " << failed_tests << ": " << reason << std::endl;
+}
+
+template< class T >
+void    RunTests()
+{
+    typedef boost::array< T, 5 >    test_type;
+    typedef T arr[5];
+    test_type           test_case; //   =   { 1, 1, 2, 3, 5 };
+    
+    T &aRef = std::get<0> ( test_case );
+    if ( &*test_case.begin () != &aRef )
+        fail_test ( "Array7: Same thing not equal?(1)" );
+        
+    const T &caRef = std::get<0> ( test_case );
+    if ( &*test_case.cbegin () != &caRef )
+        fail_test ( "Array7: Same thing not equal?(2)" );
+}
+#endif
+
+}
+
+int main()
+{
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+    RunTests< bool >();
+    RunTests< void * >();
+    RunTests< long double >();
+    RunTests< std::string >();
+#endif
+    return failed_tests;
+}
+