a std::ostream_iterator can be constructed from a ostream but not a fstream.
If the fstream is opened with the out mode how can I get a ostream_iterator?
I am not using a pointer to any base class.
Fraser.
12  2465 
"Fraser Ross" <fraserATmembers.v21.co.unitedkingdom> wrote in message
news:40********@news.greennet.net... a std::ostream_iterator can be constructed from a ostream but not a
fstream. If the fstream is opened with the out mode how can I get a
ostream_iterator? I am not using a pointer to any base class.
Fraser.
fstream derives from ostream, so you can construct an ostream_iterator from
an fstream.
Do you have some code where it's not working?
john
I am trying to use std::copy outputing to ostream_iterator. I use BCB4.
The messages are:
[C++ Error] (3): E2285 Could not find a match for
'std::ostream_iterator<T,charT,traits>::ostream_it erator(std::fstream)'.
[C++ Error] (3): E2031 Cannot cast from 'std::fstream' to
'std::ostream_iterator<T,charT,traits>'.
[C++ Error] (3): E2285 Could not find a match for
'std::copy<InputIterator,OutputIterator>(char *,char *,undefined)'.
Fraser.
"Fraser Ross" <fraserATmembers.v21.co.unitedkingdom> wrote in message
news:40******@news.greennet.net... I am trying to use std::copy outputing to ostream_iterator. I use BCB4.
The messages are:
[C++ Error] (3): E2285 Could not find a match for
'std::ostream_iterator<T,charT,traits>::ostream_it erator(std::fstream)'.
[C++ Error] (3): E2031 Cannot cast from 'std::fstream' to
'std::ostream_iterator<T,charT,traits>'.
[C++ Error] (3): E2285 Could not find a match for
'std::copy<InputIterator,OutputIterator>(char *,char *,undefined)'.
Would have helped to include that code that gives those error messages.
The following compiles for me even on the ancient VC++ 6, it also compiles
on Comeau C++.
#include <iostream>
#include <fstream>
#include <iterator>
#include <algorithm>
using namespace std;
int main(int argc, char** argv)
{
fstream file("some_file.txt");
const char msg[] = "something or other";
copy(msg, msg + strlen(msg), ostream_iterator<char>(file, ""));
}
As I said this should work, so either you have a duff compiler, a duff STL
implementation or you've made a mistake in your code.
john
In message <40******@news.greennet.net>, Fraser Ross
<fraserATmembers.v21.co.unitedkingdom@?.?.invali d> writes I am trying to use std::copy outputing to ostream_iterator. I use BCB4.
The messages are:
[C++ Error] (3): E2285 Could not find a match for
'std::ostream_iterator<T,charT,traits>::ostream_i terator(std::fstream)'.
[C++ Error] (3): E2031 Cannot cast from 'std::fstream' to
'std::ostream_iterator<T,charT,traits>'.
[C++ Error] (3): E2285 Could not find a match for
'std::copy<InputIterator,OutputIterator>(char *,char *,undefined)'.
And the corresponding C++ code is?
--
Richard Herring
"Richard Herring" And the corresponding C++ code is?
You can imagine what it is. It is only common instructions.
Fraser.
"Fraser Ross" <fraserATmembers.v21.co.unitedkingdom> wrote in message
news:40******@news.greennet.net...
"Richard Herring" And the corresponding C++ code is?
You can imagine what it is. It is only common instructions.
I would still suggest you post it. Its very easy to make mistakes without
realising that you have. At least we eliminate one possibility and then we
can start thinking about workarounds.
john
In message <40******@news.greennet.net>, Fraser Ross
<fraserATmembers.v21.co.unitedkingdom@?.?.invali d> writes
"Richard Herring" And the corresponding C++ code is?
You can imagine what it is. It is only common instructions.
Fine. In that case you can imagine my helpful response telling you where
your error is. It is only common words.
--
Richard Herring
"John Harrison" copy(msg, msg + strlen(msg), ostream_iterator<char>(file, ""));
The explicit specialisation is what my code needed. The second parameter is
unnecessary.
I notice that you can use pointers/iterators to a range of constant
elements. I had to make the elements non-const. I often have to do this.
Fraser.
On Tue, 13 Jul 2004 16:42:38 +0100, Fraser Ross
<fraserATmembers.v21.co.unitedkingdom> wrote:
"John Harrison" copy(msg, msg + strlen(msg), ostream_iterator<char>(file, ""));
The explicit specialisation is what my code needed. The second
parameter is
unnecessary.
I notice that you can use pointers/iterators to a range of constant
elements. I had to make the elements non-const. I often have to do
this.
Fraser.
Yes you have to specify what type of ostream_iterator you want. Just as
you would with any other template class.
john
"John Harrison"
Yes you have to specify what type of ostream_iterator you want. Just as
you would with any other template class.
Sometimes the template parameter/s can be deduced. I thought it would be
with ostream_iterator.
Fraser.
On Tue, 13 Jul 2004 17:51:29 +0100, Fraser Ross
<fraserATmembers.v21.co.unitedkingdom> wrote:
"John Harrison"
Yes you have to specify what type of ostream_iterator you want. Just as
you would with any other template class.
Sometimes the template parameter/s can be deduced. I thought it would be
with ostream_iterator.
Template parameter deduction only happens for function templates,
ostream_iterator is a class template.
john
On Tue, 13 Jul 2004 15:44:14 +0100, "Fraser Ross"
<fraserATmembers.v21.co.unitedkingdom> wrote:
"Richard Herring" And the corresponding C++ code is?
You can imagine what it is. It is only common instructions.
Not it isn't, since you've made a mistake in the "instructions".
Tom This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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