Add allocate_shared and make_shared for shared_ptr arrays of runtime size. Fulfills need for allocate_shared_array and make_shared_array.

[SVN r81219]

test/make_shared_array_esft_test.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2012 Glen Joseph Fernandes 
+ * glenfe at live dot com
+ *
+ * Distributed under the Boost Software License, 
+ * Version 1.0. (See accompanying file LICENSE_1_0.txt 
+ * or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+#include <boost/detail/lightweight_test.hpp>
+#include <boost/smart_ptr/enable_shared_from_this.hpp>
+#include <boost/smart_ptr/make_shared_array.hpp>
+
+class type
+    : public boost::enable_shared_from_this<type> {
+public:
+    static unsigned int instances;
+    explicit type() {
+        instances++;
+    }
+    ~type() {
+        instances--;
+    }
+private:
+    type(const type&);
+    type& operator=(const type&);
+};
+
+unsigned int type::instances = 0;
+
+int main() {
+    BOOST_TEST(type::instances == 0);
+    {
+        boost::shared_ptr<type[]> a1 = boost::make_shared<type[]>(3);
+        try {
+            a1[0].shared_from_this();
+            BOOST_ERROR("shared_from_this did not throw");
+        } catch (const boost::bad_weak_ptr&) {
+            BOOST_TEST(type::instances == 3);
+        }
+    }
+    BOOST_TEST(type::instances == 0);
+    {
+        boost::shared_ptr<type[]> a1 = boost::make_shared_noinit<type[]>(3);
+        try {
+            a1[0].shared_from_this();
+            BOOST_ERROR("shared_from_this did not throw");
+        } catch (const boost::bad_weak_ptr&) {
+            BOOST_TEST(type::instances == 3);
+        }
+    }
+    return boost::report_errors();
+}