P99_AASSIGN P99_ACCESSORS P99_ACOPY P99_ADDS P99_ADESIGNATED P99_ANDS P99_ARE_EQ P99_ARE_ORDERED P99_BANDS P99_BORS P99_DESIGNATED P99_IPOW P99_IS_INF P99_IS_MAX P99_IS_MIN P99_IS_ONE P99_IS_SUP P99_JOIN P99_LCOPY P99_ORS P99_POSS P99_PRODS P99_QUOTS P99_SIZEOFS P99_STRCATS P99_STRDUP P99_STRLENS P99_SUMS P99_TYPEDEFS P99_VASSIGNS P99_XORS

#define P99_LCOPY (   TYPE,   VAR,   ...  )    ((TYPE)P99_DESIGNATED(VAR, __VA_ARGS__)) Construct a compound literal of type TYPE by copying fields of VAR. The argument list must be composed of designators, something like struct toto { int a; int b; } A = { .a = 9, .b = 7 }; struct toto B = P99_LCOPY(struct toto, A, .b); double C[4] = { 1, 2, 3, 4 }; double *D = P99_LCOPY(double[4], C, [0], [2]); So here B.b is initialized with the value of A.b and B.a, since .a is not in the list, is initialized by 0. Likewise D gets copies of C[0] and C[2] and the other fields are initialized to 0. This is probably best used indirectly inside a type specific macro. E.g if you know that the copy operation for toto as above should always copy only .b and not .a you could do #define TOTO_LCOPY(A) P99_LCOPY(struct toto, A, .b); struct toto B = TOTO_LCOPY(A); See also: P99_DESIGNATED Warning: argument 1 may be evaluated multiple times Remarks: argument 0 should correspond to a type that is not a VLA. argument 2 must be a field designator argument 3 must be a field designator argument 4 must be a field designator Definition at line 292 of file p99_map.h.