Rename internal types:

a suffix ending with _ct means confidential type
ans is reserved for M*LIB internal usage.

OPLIST doesn't use the external types
but rather the internal types.
It enables to be independent of the real names
of the external types.
Such external names are planned to be fully customizable
(i.e. the user may define a name that suits its coding style)

m-tuple.h

@@ -196,8 +196,11 @@ namespace m_tuple {
   typedef struct M_C(name, _s) {                                        \
     M_MAP(TUPLEI_DEFINE_RECUR_TYPE_ELE , __VA_ARGS__)                   \
   } M_C(name,_t)[1];                                                    \
+                                                                        \
   typedef struct M_C(name, _s) *M_C(name, _ptr);                        \
-  typedef const struct M_C(name, _s) *M_C(name, _srcptr);
+  typedef const struct M_C(name, _s) *M_C(name, _srcptr);               \
+  /* Define internal type for oplist */                                 \
+  typedef M_C(name, _t) M_C(name, _ct);
 
 #define TUPLEI_DEFINE_RECUR_TYPE_ELE(a)                                 \
   TUPLEI_GET_TYPE a TUPLEI_GET_FIELD a ;
@@ -644,7 +647,7 @@ namespace m_tuple {
    INIT_WITH(M_C(name, _init_set2)),                                    \
    SET(M_C(name,_set)),                                                 \
    CLEAR(M_C(name, _clear)),                                            \
-   TYPE(M_C(name,_t)),                                                  \
+   TYPE(M_C(name,_ct)),                                                 \
    M_IF_METHOD_ALL(CMP, __VA_ARGS__)(CMP(M_C(name, _cmp)),),            \
    M_IF_METHOD_ALL(HASH, __VA_ARGS__)(HASH(M_C(name, _hash)),),         \
    M_IF_METHOD_ALL(EQUAL, __VA_ARGS__)(EQUAL(M_C(name, _equal_p)),),    \