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https://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html
Likewise, C++ forbids __VA_OPT__ anywhere outside the replacement list of a variadic macro. Variadic macros became a standard part of the C language with C99. GNU CPP previously supported them with a named variable argument (‘args…’, not ‘…’ and __VA_ARGS__), which is still supported for backward compatibility.
https://stackoverflow.com/questions/51810298/which-c-standard-supports-named-variadic-macros
Which C standard supports named variadic macros? [duplicate] ... getting picked does not support this named variadic macro. But it doesn't give which standard to use to resolve this warning. There are many ways to avoid this warning. ... Which standard allows usage of such named variadic macros? If GCC want to invoke warning without any ...
https://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html
Using the GNU Compiler Collection (GCC): Variadic Macros. ... 6.21 Macros with a Variable Number of Arguments. In the ISO C standard of 1999, a macro can be declared to accept a variable number of arguments much as a function can. The syntax for defining the macro is similar to that of a function.
https://stackoverflow.com/questions/5891221/variadic-macros-with-zero-arguments
I've always been using this trick until I discovered that in pedantic mode of gcc when compiling for C99 or even C11, this yields a warning. Well, not exactly this macro definition itself, but calling a variadic macro with a zero variadic part. Why, oh why didn't they allow it …
https://stackoverflow.com/questions/48045470/portably-detect-va-opt-support
warning: variadic macros are incompatible with C++98 [-Wc++98-compat-pedantic] I don't know if this detection is even possible without C++11 variadic macro support. You could consider assuming no support for __cplusplus values lower than C++11, but Clang …
https://en.wikipedia.org/wiki/Variadic_macro
A variadic macro is a feature of some computer programming languages, especially the C preprocessor, whereby a macro may be declared to accept a varying number of arguments.. Variable-argument macros were introduced in 1999 in the ISO/IEC 9899:1999 revision of the C language standard, and in 2011 in ISO/IEC 14882:2011 revision of the C++ language standard.
https://codecraft.co/2014/11/25/variadic-macros-tricks/
Nov 25, 2014 · Simple variadic macros. The first piece of magic you need to do something like this is __VA_ARGS__.This allows you to write macros that take an arbitrary number of arguments, using ... to represent the macro’s parameters:
https://gcc.gnu.org/onlinedocs/gcc-6.4.0/cpp/Variadic-Macros.html
This kind of macro is called variadic.When the macro is invoked, all the tokens in its argument list after the last named argument (this macro has none), including any commas, become the variable argument.This sequence of tokens replaces the identifier __VA_ARGS__ in the macro body wherever it appears. Thus, we have this expansion:
https://en.cppreference.com/w/cpp/language/variadic_arguments
Because variadic parameters have the lowest rank for the purpose of overload resolution, they are commonly used as the catch-all fallbacks in SFINAE. Within the body of a function that uses variadic arguments, the values of these arguments may be accessed using the <cstdarg> library facilities:
https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Variadic-Macros.html
Using the GNU Compiler Collection (GCC) 5.14 Macros with a Variable Number of Arguments. In the ISO C standard of 1999, a macro can be declared to accept a variable number of arguments much as a function can.
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