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`void` keyword as function parameter

Posted on 14 Jan 2014

While wading the Linux source code (specifically arp.c), I noticed that several function declarations used the void keyword as a parameter, like:

    static int arp_proc_init(void);
    void __init arp_init(void);

According to StackOverflow, using void in this way achieves “consistent interpretation of headers that are shared between C and C++”.

In C:

void foo() means “a function foo taking an unspecified number of arguments of unspecified type”

void foo(void) means “a function foo taking no arguments”

In C++:

void foo() means “a function foo taking no arguments”

void foo(void) means “a function foo taking no arguments”

In short, this usage of the void keyword specifies an empty parameter list in files which will be used in C.

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