From b79fd167ef39dc147e148ad1d1604e0cb82e9dab Mon Sep 17 00:00:00 2001
From: Lin Huang <lin.huang@eosnetwork.com>
Date: Sat, 26 Aug 2023 11:55:21 -0400
Subject: [PATCH] remove copy constructor from backend and use a share method
 instead

---
 include/eosio/vm/backend.hpp | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/include/eosio/vm/backend.hpp b/include/eosio/vm/backend.hpp
index 1e2069e..ec662f6 100644
--- a/include/eosio/vm/backend.hpp
+++ b/include/eosio/vm/backend.hpp
@@ -131,15 +131,6 @@ namespace eosio { namespace vm {
          construct();
       }
 
-      backend& operator=(const backend& other) {
-         if (this != &other) {
-            mod                    = other.mod;
-            exec_ctx_created_by_backend          = other.exec_ctx_created_by_backend;
-            initial_max_call_depth = other.initial_max_call_depth;
-            initial_max_pages      = other.initial_max_pages;
-         }
-         return *this;
-     }
 
       ~backend() {
          if (exec_ctx_created_by_backend && ctx) {
@@ -179,6 +170,13 @@ namespace eosio { namespace vm {
          }
       }
 
+      void share(const backend& from) {
+         mod                    = from.mod;
+         exec_ctx_created_by_backend  = from.exec_ctx_created_by_backend;
+         initial_max_call_depth = from.initial_max_call_depth;
+         initial_max_pages      = from.initial_max_pages;
+      }
+
       void set_context(context_t* ctx_ptr) {
          // ctx cannot be set if it is created by the backend
          assert(!exec_ctx_created_by_backend);