Implement allocate_local_shared for arrays

Also fix the local_shared_ptr constructor to use element_type

test/allocate_local_shared_array_esft_test.cpp

@@ -0,0 +1,94 @@
+/*
+Copyright 2017 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/lightweight_test.hpp>
+#include <boost/smart_ptr/enable_shared_from_this.hpp>
+#include <boost/smart_ptr/make_local_shared.hpp>
+
+template<class T = void>
+struct creator {
+    typedef T value_type;
+
+    template<class U>
+    struct rebind {
+        typedef creator<U> other;
+    };
+
+    creator() { }
+
+    template<class U>
+    creator(const creator<U>&) { }
+
+    T* allocate(std::size_t size) {
+        return static_cast<T*>(::operator new(sizeof(T) * size));
+    }
+
+    void deallocate(T* ptr, std::size_t) {
+        ::operator delete(ptr);
+    }
+};
+
+template<class T, class U>
+inline bool
+operator==(const creator<T>&, const creator<U>&)
+{
+    return true;
+}
+
+template<class T, class U>
+inline bool
+operator!=(const creator<T>&, const creator<U>&)
+{
+    return false;
+}
+
+class type
+    : public boost::enable_shared_from_this<type> {
+public:
+    static unsigned instances;
+
+    type() {
+        ++instances;
+    }
+
+    ~type() {
+        --instances;
+    }
+
+private:
+    type(const type&);
+    type& operator=(const type&);
+};
+
+unsigned type::instances = 0;
+
+int main()
+{
+    BOOST_TEST(type::instances == 0);
+    {
+        boost::local_shared_ptr<type[]> result =
+            boost::allocate_local_shared<type[]>(creator<type>(), 3);
+        try {
+            result[0].shared_from_this();
+            BOOST_ERROR("shared_from_this did not throw");
+        } catch (...) {
+            BOOST_TEST(type::instances == 3);
+        }
+    }
+    BOOST_TEST(type::instances == 0);
+    {
+        boost::local_shared_ptr<type[]> result =
+            boost::allocate_local_shared_noinit<type[]>(creator<>(), 3);
+        try {
+            result[0].shared_from_this();
+            BOOST_ERROR("shared_from_this did not throw");
+        } catch (...) {
+            BOOST_TEST(type::instances == 3);
+        }
+    }
+    return boost::report_errors();
+}