P99_APLAIN P99_ASUB P99_MAC_ARGS P99_MEMSET P99_MEMZERO P99_PZERO P99_TZERO

P99_MAC_ARGS #define P99_MAC_ARGS (   ... ) Value: P99_FOR(, P99_NARG(__VA_ARGS__), P00_SEP, P00_MAC_ARGS_REAL0, __VA_ARGS__); \ P99_FOR(, P99_NARG(__VA_ARGS__), P00_SEP, P00_MAC_ARGS_REAL1, __VA_ARGS__) Declare macro parameters as local variables as if the macro were declared as a type generic inline function. Remarks This uses the typeof extension implemented by gcc. This receives parenthesized pairs of name and value that are to be promoted as local variables inside a macro expansion. Use this as follows: #define atomic_fetch_add_conditional(OBJP, OPERAND) \ ({ \ P99_MAC_ARGS((p00_objp, OBJP), (p00_op, OPERAND)); \ ... \ }) Remarks The corresponding local variables have exactly the type of the expressions that are passed as the 2nd element in each pair. This achieves several objectives Each macro parameter is evaluated exactly once. The values of the macro parameters are accessible through an ordinary identifier. Even if a variable with one of the names is passed through a macro parameter (e.g by calling atomic_fetch_add_conditional(p00_op->next, 23)) there will be no conflict. This is done by evaluating all macro arguments first, as it would be for a function call, and then assigning it to fresh variables. Remarks argument 0 maybe evaluated several times for its type but only once for its value argument 1 maybe evaluated several times for its type but only once for its value argument 2 maybe evaluated several times for its type but only once for its value Definition at line 1236 of file p99_for.h.