src: disallow copying, double close of scopes

PR-URL: #566
Reviewed-By: NickNaso <nicoladelgobbo@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>

napi.h

@@ -1729,6 +1729,10 @@ namespace Napi {
     explicit HandleScope(Napi::Env env);
     ~HandleScope();
 
+    // Disallow copying to prevent double close of napi_handle_scope
+    HandleScope(HandleScope const &) = delete;
+    void operator=(HandleScope const &) = delete;
+
     operator napi_handle_scope() const;
 
     Napi::Env Env() const;
@@ -1744,6 +1748,10 @@ namespace Napi {
     explicit EscapableHandleScope(Napi::Env env);
     ~EscapableHandleScope();
 
+    // Disallow copying to prevent double close of napi_escapable_handle_scope
+    EscapableHandleScope(EscapableHandleScope const &) = delete;
+    void operator=(EscapableHandleScope const &) = delete;
+
     operator napi_escapable_handle_scope() const;
 
     Napi::Env Env() const;
@@ -1761,6 +1769,10 @@ namespace Napi {
     CallbackScope(napi_env env, napi_async_context context);
     virtual ~CallbackScope();
 
+    // Disallow copying to prevent double close of napi_callback_scope
+    CallbackScope(CallbackScope const &) = delete;
+    void operator=(CallbackScope const &) = delete;
+
     operator napi_callback_scope() const;
 
     Napi::Env Env() const;