dhh1128

// Define two overrides that can be used by the expansion of 
// our main macro.
#define _MY_CONCAT3(a, b, c) a b c
#define _MY_CONCAT2(a, b) a b

// Define a macro that uses the "paired, sliding arg list"
// technique to select the appropriate override. You should
// recognize this as similar to the GET_NTH_ARG() macro in
// previous examples.
#define _GET_OVERRIDE(_1, _2, _3, NAME, ...) NAME

dhh1128

// Accept any number of args >= N, but expand to just the Nth one.
// Here, N == 6.
#define _GET_NTH_ARG(_1, _2, _3, _4, _5, N, ...) N

// Define some macros to help us create overrides based on the
// arity of a for-each-style macro.
#define _fe_0(_call, ...)
#define _fe_1(_call, x) _call(x)
#define _fe_2(_call, x, ...) _call(x) _fe_1(_call, __VA_ARGS__)
#define _fe_3(_call, x, ...) _call(x) _fe_2(_call, __VA_ARGS__)

dhh1128

#define eprintf(fmt, ...) \
    fprintf(stderr, fmt, ##__VA_ARGS__)

dhh1128

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