added get_addr in endpoint

include/thallium/endpoint.hpp

@@ -102,6 +102,18 @@ public:
         return m_addr == HG_ADDR_NULL;
     }
 
+    /**
+     * @brief Returns the underlying Mercury address.
+     *
+     * @param copy If set to true, a copy of the address will be made.
+     * (the user will be responsible for calling margo_addr_free on this
+     * address) Otherwise, the hg_addr_t returned is the one managed by
+     * the endpoint instance and will be deleted when this enpoint is destroyed.
+     *
+     * @return The underlying hg_addr_t.
+     */
+    hg_addr_t get_addr(bool copy=false) const;
+
     template<typename S>
     friend S& ::operator<<(S& s, const endpoint& e);
 };

src/endpoint.cpp

@@ -78,7 +78,17 @@ endpoint::operator std::string() const {
     ret = margo_addr_to_string(m_engine->m_mid, &result[0], &size, m_addr);
     MARGO_ASSERT(ret, margo_addr_to_string);
 	return std::string(result.data());
-} 
+}
+
+hg_addr_t endpoint::get_addr(bool copy) const {
+    if(!copy || m_addr == HG_ADDR_NULL) return m_addr;
+    if(m_engine == nullptr) return HG_ADDR_NULL;
+    hg_addr_t new_addr;
+    hg_return_t ret = margo_addr_dup(m_engine->get_margo_instance(), m_addr, &new_addr);
+    // TODO throw an exception if the call fails
+    if(ret != HG_SUCCESS) return HG_ADDR_NULL;
+    return new_addr;
+}
 
 }