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From: James Kuyper <jameskuyper@verizon.net>
Subject: Re: Unused named function argument
Organization: A noiseless patient Spider
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Xref: csiph.com comp.std.c++:540


On 08/30/2012 12:36 PM, andrew.gottemoller@debesys.net wrote:
>
> When compiling using gcc with, the below code will compile without any sort of error:
>
>
> int foo (int)
> {
>      return 5;
> }
>
>
> Can the compilation result differ if I specify a name for the argument?
>
> I can't see any way the naming of the parameter would ever make a difference in the actual compilation result.  The question arose because I noticed when compiling the following C program:
>
>
> // Compile: gcc --std=c99 -c -pedantic -Wall -O3 foo.c
> int foo (int)
> {
>      return 5;
> }
>
>
> The error: 'parameter name omitted' is output by the compiler.
>
> Is there any non-obvious significance in the parameter name with C++11 or C99?

In n1570 (which is very close to C2011) 6.9.1p5 is a constraint applying
to function definitions: "If the declarator includes a parameter type
list, the declaration of each parameter shall include an identifier,
except for the special case of a parameter list consisting of a single
parameter of type void, in which case there shall not be an identifier.
..." The C99 wording was identical.
6.9.1p6 says equivalent things about K&R style function declarations,
which are still allowed.

I could find no comparable wording in the C++ standard, so this may not
be true of C++11.


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