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Fix warning for zero variadic macro arguments. (#2151)

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When consuming dlib headers and building using gcc/clang with flags
'-Werror -Wpedantic', any inclusion involving DLIB_CASSERT triggers
a compilation error: ISO C++11 requires at least one argument for the
"..." in a variadic macro

Co-authored-by: Samuel Aldana <samuel.aldana@cognex.com>
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samaldana 2020-08-20 01:37:57 +02:00 committed by GitHub
parent f3b4fc548d
commit 2a870e329c
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1 changed files with 1 additions and 1 deletions
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dlib/assert.h
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@ -160,7 +160,7 @@ namespace dlib
#define DLIBM_CASSERT_1_ARGS(exp) DLIBM_CASSERT(exp,"")
#define DLIBM_CASSERT_2_ARGS(exp,message) DLIBM_CASSERT(exp,message)
#define DLIBM_GET_3TH_ARG(arg1, arg2, arg3, ...) arg3
#define DLIBM_CASSERT_CHOOSER(...) DLIB_WORKAROUND_VISUAL_STUDIO_BUGS(DLIBM_GET_3TH_ARG(__VA_ARGS__, DLIBM_CASSERT_2_ARGS, DLIBM_CASSERT_1_ARGS))
#define DLIBM_CASSERT_CHOOSER(...) DLIB_WORKAROUND_VISUAL_STUDIO_BUGS(DLIBM_GET_3TH_ARG(__VA_ARGS__, DLIBM_CASSERT_2_ARGS, DLIBM_CASSERT_1_ARGS, NEVER_USED))
#define DLIB_CASSERT(...) DLIB_WORKAROUND_VISUAL_STUDIO_BUGS(DLIBM_CASSERT_CHOOSER(__VA_ARGS__)(__VA_ARGS__))