quick-start.md

Quick Start

Using y_va is very simple. When you want to pass multiple additional parameters use ___(n), where n is the number of parameters you DON'T want to pass. In short, if you have a function that takes variable arguments (...), you can pass them all to another varargs function:

#include <YSI_Coding\y_va>

VarArgsFunc2(const str[], ...)
{
	printf(str, ___(1));
}

VarArgsFunc1(n, const str1[], const str2[], ...)
{
	if (n)
	{
		VarArgsFunc2(str1, ___(3));
	}
	else
	{
		VarArgsFunc2(str2, ___(3));
	}
}

VarArgsFunc2 has 1 normal parameter, so we call printf with ___(1). VarArgsFunc1 has 3 normal parameters, so calls VarArgsFunc2 with ___(3).

The simple way to remember is - 3 dots to take variable parameters, 3 underscores to pass them.

The following code:

PrintStuff(...)
{
	printf("%d %d %d %d %d", ___(0));
}

main()
{
	PrintStuff(0, 1, 2, 3, 4);
}

Will print 0 1 2 3 4.