Re: [Boost-users] Boost.Iostreams + error handling

Martin Slater wrote:

Hi there,

Are exceptions the only way to propogate an error out of and IOStreams.Device policy? We have a lot of code using this style

std::istream is(file);

if(is) { .... }

and would like not to have to change it all over to use ios exceptions but I can't see a way to avoid it. Is it possible?

When you use a stream, rather than a streambuf, exceptions are caught automatically and translated into stream state, unless you set the exception mask to request that exceptions be propagated. (See http://www.boost.org/libs/iostreams/doc/index.html?path=3.10) The only time you have to be prepared to handle exceptions is when you are using a raw stream buffer.

thanks

Martin

Jonathan