Updating docs.

[SVN r77944]

example/const_block_error_cxx11_lambda.cpp

@@ -0,0 +1,28 @@
+
+// Copyright (C) 2009-2012 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0
+// (see accompanying file LICENSE_1_0.txt or a copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+// Home at http://www.boost.org/libs/local_function
+
+#include <boost/config.hpp>
+#ifdef BOOST_NO_LAMBDAS
+#   error "requires lambda functions"
+#else
+
+#include <cassert>
+
+int main(void) {
+    //[const_block_cxx11_lambda
+    int x = 1, y = 2;
+    const decltype(x)& const_x = x; // Constant so cannot be modified
+    const decltype(y)& const_y = y; // and reference so no copy.
+    [&const_x, &const_y]() {        // Lambda functions (C++11 only).
+        assert(const_x = const_y);  // Unfortunately, `const_` names.
+    }();
+    //]
+    return 0;
+}
+
+#endif // LAMBDAS
+