Re: serializing and deserializing enum type

 James Kanze <>
Tue, 14 Aug 2007 13:59:53 -0000
On Aug 14, 11:02 am, wrote:

I got series warning when using write enum type to a ostream using
operator<<, like

in call to `std::basic_ostream<_CharT, _Traits>&
std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT =
char, _Traits = std::char_traits<char>]'
A.cpp:60: warning: passing `NAME_ENUM' chooses `int' over `long int'

Compiler gcc 3.4.3

When deserialize from an istream, I have to first using an int, and
then cast to the enum type. And need check the range on the spot.

I do know I can overload operator<< and >> for enum type, but do that
for every enum type isn't too boring? I'm wondering a way to do it in
one strike, is there?

Yes. Write a program which reads the enum and generates the
desired mapping. (There's one at my site:, the executable enumgen. The
version there is somewhat preliminary, however, and I've since
modified it so that the generated code has no dependencies on
other things in my library. Still, the code is simple enough
that you should be able to adopt it.)

James Kanze (GABI Software)
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