variadic-functions

I would like to understand better what happens when the Java compiler encounters a call to a method like the one below. <T extends AutoCloseable & Cloneable> void printType(T... args) { System.out.println(args.getClass().getComponentType().getSimpleName()); } // printType() prints "AutoCloseable" It is clear to me that there is no type <T extends AutoCloseable & Cloneable> at runtime, so the compiler makes the least wrong thing it can do and creates an array with the type of one of the two bounding interfaces, discarding the other one. Anyway, if the order of the interfaces is switched, the

I'm trying to create a function that gets a variadic function as an argument , i.e. func :: (a -> ... -> a) -> a how can I accomplish this? I've read about polyvariadic functions and I'm sure that Oleg already did it , however I'm lost trying to apply the pattern on a function with a variadic function as an argument. Especially Olegs approach seems to work with glasgow extensions only and I want the solution to work in pure Haskell 98 (like Text.Printf does). The reason that I ask is that I'm trying to build a function which takes a boolean function as an argument and checks whether it is a

following is the implementation of my method static VALUE myMethod(VALUE self, VALUE exc, const char* fmt, ...) { // Need to get all the arguments passed to this function and print it } function is called as follows: myMethod(exception, ""Exception message: %s, Exception object %d", "Hi from Exception", 100); Can you provide the code for myMethod() that will access all the arguments and print them out. Thanks in advance. The va_start and va_arg macro's are used to get the variable arguments in a function. An example can be found on the Microsoft site: http://msdn.microsoft.com/en-us/library

This question already has an answer here: what is the use of … in c++ 2 answers I was wondering if the below function prototype is valid. It compiled fine, but the three period is kinda throwing me off and I couldn't find anything similar on Google. void foo(int, ...); Thanks! Yes, it's valid. In this example, ... creates a variadic function using the va_list mechanism. This is how variadic functions are implemented in C, and to some degree in C++ (though C++11's template parameter packs have rendered this mechanism obsolete). Further reading: va_arg 来源： https://stackoverflow.com/questions

I was trying to implement function with variable arguments but was getting garbage values as output.I have referred to this article before trying to implement on my own.Could anyone help me out with this code as I am unable to understand what's wrong in this code. /* va_arg example */ #include <stdio.h> /* printf */ int FindMax (int n, ...) { int i,val,largest,*p; p=&n; p+=sizeof(int); largest=*p; for (i=1;i<n-2;i++) { p+=sizeof(int); val=*p; largest=(largest>val)?largest:val; } return largest; } int main () { int m; m= FindMax (7,702,422,631,834,892,104,772); printf ("The largest value is: %d

I apologize for the unclear topic title. I have this function in Scheme which is a custom implementation of the map function. It works fine, but I got lost trying to understand it. (define (my-map proc . ls) (letrec ((iter (lambda (proc ls0) (if (null? ls0) '() (cons (proc (car ls0)) (iter proc (cdr ls0)))))) (map-rec (lambda (proc ls0) (if (memq '() ls0) '() (cons (apply proc (iter car ls0)) (map-rec proc (iter cdr ls0))))))) (map-rec proc ls))) The problem lays in cons (proc (car ls0)) . If I'm correct, when passing (1 2 3) (4 5 6) to the ls parameter the actual value of it will be ((1 2 3)

I am writing a heavy multi threaded [>170 threads] c++11 program. Each thread is logging information into one file used by all threads. For performance reasons I want to create a log thread which is writing the information via fprintf() into the global file. I have no idea how to organize the structure into which the worker threads are writing the information which can be then read by the log thread. Why do I not call sprintf() in each worker thread and then just provide the output buffer to the log thread? For the formatted output into the log file I am using a locale in the fprintf()