Re: Help needed for STL ifstream class

From:

"Victor Bazarov" <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Fri, 5 Oct 2007 22:20:13 -0400

Message-ID:

<fe6rdb$iaq$1@news.datemas.de>

Kira Yamato wrote:

I've posted this in another thread, but I suppose I should've started
a new thread for it instead.

I cannot get the following short program to compile under g++:

#include <iostream>
#include <fstream>
#include <iterator>
#include <algorithm>

using namespace std;

int main(int argc, char **argv)
{
copy(istream_iterator<char>(argc >= 2 ? ifstream(argv[1]) : cin),

'istream_iterator's constructor that accepts a stream object takes the
argument by non-const reference. A non-const reference cannot be bound
to a temporary. You need to create a separate object of type 'ifstream'
and then pass it to the 'istream_iterator's constructor.

// this line won't compile!
istream_iterator<char>(),
ostream_iterator<char>(cout));

return 0;
}

The compiler error messages are as followed:

[..]

V
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