remove Impl from proxy

tools/templates/proxy.cpp.j2

@@ -1,19 +1,11 @@
 #include "{{ cls.name }}.proxy.h"
 
-class {{ cls.name }}Proxy::Impl {
-public:
-    explicit Impl(ProxyMarshaller& m)
-        : client(m) {}
-
-    ProxyMarshaller& client;
-};
-
 {{ cls.name }}Proxy::{{ cls.name }}Proxy(ProxyMarshaller& marshaller)
-    : impl(new Impl(marshaller)) {}
+    : impl(marshaller) {}
 
 {% for m in cls.methods %}
 {{ m.return_type }} {{ cls.name }}Proxy::{{ m.name }}({% for a in m.args %}{{ a.type }} {{ a.name }}{% if not loop.last %}, {% endif %}{% endfor %}) {
-    return impl->client.call<{{ m.return_type }}>("{{ cls.name }}.{{ m.name }}"{% for a in m.args %}, {{ a.name }}{% endfor %});
+    return impl.call<{{ m.return_type }}>("{{ cls.name }}.{{ m.name }}"{% for a in m.args %}, {{ a.name }}{% endfor %});
 }
 {% endfor %}
 

tools/templates/proxy.h.j2

@@ -10,6 +10,5 @@ public:
     {% endfor %}
 
 private:
-    class Impl;
-    Impl* impl;
+    ProxyMarshaller& impl;
 };