What the use of (void)(a)?

[c0ee]

I don't know what the use of following macro, does anyone know it?
#define NOT_USED(a) (void )(a)

Thanks.

 

[Hemant Mohan]

This is used to prevent compile r warnings/ errors in case of unused
local parameters / variables in a function.

 

[Peter Nilsson]

This is used to prevent compile r warnings/ errors in case of unused
local parameters / variables in a function.

What is? Please quote the context of the message you're replying to...

Note that warnings can be issued for _any_ reason. So, whilst the
following use of the macro may silence a warning about an unused
parameter...

void foo(int a, int b)
{
NOT_USED(a);
return b + 42;
}

....it may provoke a warning about the unused expression value in other
compilers.

 

[c0ee]

I see.
Thanks for your kindly reply.

 

[Keith Thompson]

I see.
Thanks for your kindly reply.

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