How to use macros in calling another macro?

Question

I would like to create a macro that calls other macros. The macro, which I would call, is a macro Benchmarkfrom folly .

Ultimately, I would like to have a bunch of macros that look like this:

BENCHMARK(filter_10_vector_1_filter, n) { ... }
BENCHMARK(filter_10_set_1_filter, n) { ... }
BENCHMARK(filter_10_vector_2_filter, n) { ... }
BENCHMARK(filter_10_set_2_filter, n) { ... }
BENCHMARK(filter_10_vector_3_filter, n) { ... }
BENCHMARK(filter_10_set_3_filter, n) { ... }
... all the way to 10_filter

BENCHMARK(filter_100_vector_1_filter, n) { ... }
BENCHMARK(filter_100_set_1_filter, n) { ... }
... all the way to 10_filter

I tried to create a macro that looks like this:

#define CreateBenchmark(numElements, numFilters) \
  BENCHMARK(filter_##numElements_vector_##numFilters_filters, n) { ... } \
  BENCHMARK_RELATIVE(filter_##numElements_set_##numFilters_filters, n) { ... }

CreateBenchmark(10, 2);

which we hope will halve the number of macros I need to write. However, replacement ##numElementsand ##numFiltersdo not happen as I had hoped. The result of the call CreateBenchmark(10, 2)is

============================================================================
FilterWithSetBenchmark.cpp  relative  time/iter  iters/s
============================================================================
filter_numElements_vector_numFilters_filters               264.35us    3.78K
filter_numElements_set_numFilters_filters         99.93%   264.54us    3.78K
============================================================================

I expected filter_10_vector_2_filtersand fitler_10_set_2_filters. Is there a way to pass the values ​​provided to the macro CreateBenchmarkto the values ​​passed to Benchmarkand calls BENCHMARK_RELATIVE?

CreateBenchmark for XX_filters, CreateBenchmark 20 (10 _vector_ 10 _set_)

Answer 1

##:

#define CreateBenchmark(numElements, numFilters) \
  BENCHMARK(filter_ ## numElements ## _vector_ ## numFilters ## _filters, n) { ... } \
  BENCHMARK_RELATIVE(filter_ ## numElements ## _set_ ## numFilters ## _filters, n) { ... }

## , + Java Python.

Answer 2

. #. :

#define CreateBenchmark(numElements, numFilters) \
  BENCHMARK(filter_##numElements##_vector_##numFilters##_filters, n) { ... } \
  BENCHMARK_RELATIVE(filter_##numElements##_set_##numFilters##_filters, n) { ... }

, , , #. ##numElements ##numElements##. numFilters.

Answer 3

__VA_ARGS__ .