Re: [Boost-users] boost::lambda library, error with << operator (on g++ with SGI STL)

10 Jul 2007


      Maciek Godek wrote:
...
function f =
    if_(_1 == _2) [
            cout << cref("arguments are equal\n")
    ].else_[
            cout << cref("arguments differ\n")
    ];
f(1, 1);
  f(1, 2);
}
On g++ 3.3.4 I got a (scarcely readable) error that std::ios_base copy
constructor is private (the more recent compiler gave much more trashy
output, but I've infered that the reason is probably the same).
I think you need to surround the cout with boost::ref, i.e. boost::ref( 
cout ). The lambda takes a copy of its argument, and you  want to make 
sure that it uses the reference instead.


K

Re: [Boost-users] boost::lambda library, error with << operator (on g++ with SGI STL)

Kirit Sælensminde