Add SWAP as operator.

README.md

@@ -302,6 +302,7 @@ Other operators are:
 * DEL (&obj) : free the allocated uninitialized object 'obj' (default is free). The object is not cleared before being free.
 * INIT\_MOVE(objd, objc): Initialize 'objd' to 'objc' by stealing as resources as possible from 'objc' and then clear 'objc'. It is equivalent to calling INIT\_SET(objd,objc) then CLEAR(objc) (but usually way faster).
 * MOVE(objd, objc): Set 'objd' to 'objc' by stealing as resources as possible from 'objc' and then clear 'objc'. It is equivalent to calling SET(objd,objc) then CLEAR(objc) or CLEAR(objd) and then INIT\_MOVE(objd, objc).
+* SWAP(objd,objc): Swap the object c and object d contains.
 * HASH (obj) --> size_t: return a hash of the object (used for hash table). Default is performing a hash of the memory representation of the object.
 * EQUAL(obj1, obj2) --> bool: return true if both objects are equal, false otherwise. Default is using memcmp.
 * CMP(obj1, obj2) --> int: return a negative integer if obj1 < obj2, 0 if obj1 = obj2, a positive integer otherwise. Default is C comparison operators.

m-core.h

@@ -598,6 +598,7 @@
 #define M_INIT_INIT(a)           ,a,
 #define M_INIT_SET_INIT_SET(a)   ,a,
 #define M_INIT_MOVE_INIT_MOVE(a) ,a,
+#define M_SWAP_SWAP(a)           ,a,
 #define M_SET_SET(a)             ,a,
 #define M_MOVE_MOVE(a)           ,a,
 #define M_CLEAR_CLEAR(a)         ,a,
@@ -651,6 +652,7 @@
 #define M_GET_INIT_MOVE(...) M_GET_METHOD(INIT_MOVE,   M_MOVE_DEFAULT,     __VA_ARGS__)
 #define M_GET_SET(...)       M_GET_METHOD(SET,         M_SET_DEFAULT,      __VA_ARGS__)
 #define M_GET_MOVE(...)      M_GET_METHOD(MOVE,        M_MOVE_DEFAULT,     __VA_ARGS__)
+#define M_GET_SWAP(...)      M_GET_METHOD(SWAP,        M_MOVE_DEFAULT,     __VA_ARGS__)
 #define M_GET_CLEAR(...)     M_GET_METHOD(CLEAR,       M_CLEAR_DEFAULT,    __VA_ARGS__)
 #define M_GET_DEL(...)       M_GET_METHOD(DEL,         M_DEL_DEFAULT,      __VA_ARGS__)
 #define M_GET_HASH(...)      M_GET_METHOD(HASH,        M_NO_DEFAULT,       __VA_ARGS__)