From: nobu.nokada@...
Date: 2005-02-11T01:39:12+09:00
Subject: Re: mkmf and enum values

Hi,

At Thu, 10 Feb 2005 01:35:11 +0900,
Daniel Berger wrote in [ruby-talk:130253]:
> What's the best way to tell if an enum member contains a particular
> value?

Enum values are used as just integers, so it would be difficult
to check if a symbol belongs to an enum.

> My question in particular centers around the idtype_t enum, and I'm
> writing some code that I want to make cross platform.  On Solaris 9,
> the enum contains values like P_ALL, P_CID, etc.  I don't know that all
> of these exist, or if they have slightly different names, on other
> platforms.  I think in older versions of Linux they were PS_, instead
> of P_, for example.
> 
> With a struct, for example, I know you can do something like this:
> 
> have_struct_member("struct type","member","someheader.h")
> 
> However, I didn't see anything like a "have_enum_value".

  def have_enum_value(enum, val, headers = nil)
    try_compile(cpp_include(headers)+"enum #{enum} conftest_val = #{val};")
  end

-- 
Nobu Nakada