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NaN values in c++

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Dear all,
is there in c++ an analogous of Matlab NaN values?
In Matlab NaN is a special value that you can assign
to double variables and use it for example to mark special position
in vectors (for example imagine a polygon made of two disjoint regions,
you can separate the two regions using NaN),
it is the value returned when making a 0/0 division and so on

Is there any such special value in c++? Googling I think there is
and that I have to use a <limit> library, but I couldn't really
find more information, especially concerning the efficiency of such a library.

Thanks a lot in advance for your help in advance,
Luca

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NaN values in c++ Luca Cerone <luca.cerone@gmail.com> - 2012-03-02 01:24 -0800
  Re: NaN values in c++ "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-03-02 11:43 +0100
    Re: NaN values in c++ Marc <marc.glisse@gmail.com> - 2012-03-02 11:33 +0000
      Re: NaN values in c++ Luca Cerone <luca.cerone@gmail.com> - 2012-03-02 08:01 -0800
        Re: NaN values in c++ Paavo Helde <myfirstname@osa.pri.ee> - 2012-03-02 11:14 -0600
      Re: NaN values in c++ Miles Bader <miles@gnu.org> - 2012-03-03 07:35 +0900

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