Over-loading Functions in C ,Get Help From Experts

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It is well known that C++ allows one to unwanted features, and C does not. This is usually done by "mangling" the name of a work, and thus such as the types of its explanations in the symbol information. Each version of a complete work will then obtain a different excellent name for the accessibility way. So by getting in touch with or getting to the appropriate symbol we is capable of doing the right version of the work.

Typically, the C compiler does not work symbol name mangling at all. (This is ignoring highlight online criminals.) What this means is that you usually cannot figure out two versions of a work. They'll get the same excellent name, and the linker will protest.

However, this isn't quite the whole story. Various places of the C and POSIX specifications need complete versions of C features to be available. The most convenient of these is the information of the open() work. This work needs two explanations, the first of which describes the route of the computer file to begin, and the second a set of ads describing exactly how to begin the pc file. There is a recommended third parameter that is only necessary when the pc file may be developed. This third parameter describes the read write adjustments to use for the new pc computer file.

So how do we specify a recommended extra parameter in C code? This is a way of work overloading; over stuffing by wide range of aspects. Obviously it isn't done by mangling, and instead the va_args system can be used. A performance of a work which needs only two explanations, with a recommended third parameter only necessary when the second parameter needs a particular value is:


#include <stdio.h>
#include <stdarg.h>

void va_overload2(int p1, int p2)
{
printf("va_overload2 %d %d\n", p1, p2);
}

void va_overload3(int p1, int p2, int p3)
{
printf("va_overload3 %d %d %d\n", p1, p2, p3);
}

static gap va_overload(int p1, int p2, ...)
{
if (p2 == 7)
{
va_list v;
va_start(v, p2);
int p3 = va_arg(v, int);
va_end(v);
va_overload3(p1, p2, p3);
return;
}

va_overload2(p1, p2);
}

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