what variable parameter

Variable parameters A variable parameter is a method that can receive any number of arguments! For example: Fun (), fun (1), Fun (1,1), Fun (1,1,1). You may think that this is a method overload, but this is not an overload, you think how many

The tuple introduced in C ++ 11 is an N-tuple. It is equivalent to a struct with n members, but the members of this struct are anonymous. Tuple has two special functions, one is head (), used to obtain the value of the first Member, and the other is

Http://blog.csdn.net/ithzhang/article/details/7021317 A variable-length function is a function with variable numbers and variable parameter types. The most common examples are printf, scanf, and format functions in advanced languages. In C/C ++, to

1. OverviewThis article describes a method for implementing the C + + reflection mechanism through C + + variadic templates. This method is very practical, and it is widely used in Nebula High Performance network framework, which realizes the

We take the very familiar function of printf as an example to analyze the variable parameter function. First look at the definition of the printf function:int printf(const char *fmt, ...){ int i; int len; /* va_list 即 char * */ va_list

1. The function that gets the variable parameter gets the function of the variable parameter as the array type of the get parameter type. Clazz.getmethod ("test", object[]. Class);where object is a variable parameter or the data type of an arrayFor

The Variable Parameter template is a new feature in C ++ 11. It mainly solves the problem of Variable Parameter quantity in the original template. The tuple implementation of the standard library is implemented based on the variable parameter

Variable parameter types in Java methods are a very important concept and have a very wide range of applications. This article analyzes it in the form of an example. Specifically as follows: In general, many Java beginners will ask a question when

In some applications, we want the number of arguments for a parameter to be variable to meet the requirements, such as the library functions printf and scanf in stdio.h. The following example: #include #include using namespace std; int max1 (int

C + + has the function of overloading this method, for us to call when we can not determine the number of arguments, in fact, C language can be, and more clever!We can see the prototype of the printf () function in stdio.h:int printf (char * format,.

The number of arguments in a function prototype is fixed in general, but what if you want to receive an indefinite number of arguments at different times? The C language provides a variable list of parameters to implement.Variable parameter lists

Va_list is a set of macros that resolves a parameter problem in the C language, defined under the header file.Usage of va_list:(1) First define a variable of type va_list in a function, which is a pointer to a parameter(2) Then use the Va_start

classlogger{ Public: /** * @brief Get Logger instances*/ Staticlogger*Instance () {if(!ms_pinstance) ms_pinstance=NewLogger; returnms_pinstance; } /** * @brief Destroy instances*/ Static voiddestory () {if(ms_pinstance) {delete

[Simple Java] Java Variable Parameter example, simplejavaWhat is a Java Variable Parameter? Variable parameters are a feature introduced by Java 1.5. They allow a method to accept any number of parameters. Package simplejava; public class Q25

Variable parameter function:The number of formal parameters in a function is usually deterministic, and in turn, all the actual arguments corresponding to the formal parameters are passed in sequence, but in some functions the number of arguments

PHP Extracurricular notes--implementation of variable parameter list of function PHP is very powerful in terms of functions, but for some novice PHP, understanding is part of the difficulty, not fully mastered.In the PHP training tutorial, we

The C function uses the following macros in the program:void Va_start (va_list arg_ptr, prev_param);type Va_arg (va_list arg_ptr, type);void Va_end (va_list arg_ptr);va_list:a type of information required to hold macro va_start,va_arg , and va_end .

Java1.5 adds new features: Variable parameters: The case where the parameter number is indeterminate and the type is determined, Java treats the variable parameters as an array. Note: The variable parameter must be in the last item. When the number

I just want to record the usage of the Variable Parameter List in C. I can't remember it later and have no reference manual at hand. For convenience, I wrote it in C ++, don't blame me. //// Variable Parameter List Example//# Include # Include #

Let's take a look at a simple example. Calculate the sum of squares of any natural number: Int sqsum (int n ,...) { va_list arg_ptr; int sum = 0, _ n = N; arg_ptr = va_start (arg_ptr, N ); while (_ n! = 0) { sum + = (_ n * _ n); _ n = va_arg