The R language has a nifty feature for defining functions that can take a variable number of arguments. For example, the function data.frame takes any number of arguments, and each argument becomes the data for a column in the resulting data table. Example usage: > data.frame(letters=c(“a”, “b”, “c”), numbers=c(1,2,3), notes=c(“do”, “re”, “mi”)) letters numbers notes … Read more
I want to write a macro in C that accepts any number of parameters, not a specific number example: #define macro( X ) something_complicated( whatever( X ) ) where X is any number of parameters I need this because whatever is overloaded and can be called with 2 or 4 parameters. I tried defining the … Read more
In C, is it possible to forward the invocation of a variadic function? As in, int my_printf(char *fmt, …) { fprintf(stderr, “Calling printf with fmt %s”, fmt); return SOMEHOW_INVOKE_LIBC_PRINTF; } Forwarding the invocation in the manner above obviously isn’t strictly necessary in this case (since you could log invocations in other ways, or use vfprintf), … Read more
I know this is a basic question, but I couldn’t find an answer. Why use it? if you write a function or a method that’s using it, when you remove it the code will still work perfectly, 100% as without it. E.g: With params: static public int addTwoEach(params int[] args) { int sum = 0; … Read more
