std::ostream_iterator with non std object

[er]

Hello,

Could someone please suggest a solution for this that works with
std:stream_iterator:

struct foo
{

foo(){}

private:
friend std:stream & operator<<(std:stream &os, const foo&
p);
};

std:stream& operator<<( std:stream& os, foo const& t)
{
// whatever
}

typedef std::vector<foo> vec_;
vec_ vec; vec.push_back( foo() );

std::copy(
vec.begin(),
vec.end(),
std:stream_iterator<foo>( std::cout, " ")
);

error : no match for call to std:stream_iterator<foo>( foo& );

 

[Jonathan Lee]

Hello,

Could someone please suggest a solution for this that works with
std:stream_iterator:

*shrugs*
Works fine for me with minimal changes:

#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>

struct foo {
foo(){}
private:
friend std:stream & operator<<(std:stream &os, const foo& p);
};

std:stream& operator<<( std:stream& os, foo const& t) {
os << "derp";
return os;
}

int main() {
std::vector<foo> vec;
vec.push_back( foo() );

std::copy(vec.begin(), vec.end(),
std:stream_iterator<foo>( std::cout, " ")
);
return 0;
}
--Jonathan

 

[er]

*shrugs*
Works fine for me with minimal changes:

#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>

struct foo {
    foo(){}
private:
    friend std:stream & operator<<(std:stream &os, const foo& p);

};

std:stream& operator<<( std:stream& os, foo const& t) {
    os << "derp";
    return os;

}

int main() {
    std::vector<foo> vec;
    vec.push_back( foo() );

    std::copy(vec.begin(), vec.end(),
        std:stream_iterator<foo>( std::cout, " ")
    );
    return 0;}

--Jonathan

Besides the include statements, could you please point out the
specific changes?

PS: I Use OS X 10.6.4, GCC 4.2.

 

[Jonathan Lee]

Besides the include statements, could you please point out the
specific changes?

PS: I Use OS X 10.6.4, GCC 4.2.

Um... I put actual code in the operator<< and I wrapped it in main. I
really didn't do very much. I think your code is basically fine.

Fedora Linux/gcc 4.4 (for comparison).

--Jonathan

 

[er]

really didn't do very much. I think your code is basically fine.

And yet

std:stream_iterator<foo> output1(std::cout, " ");
output( foo() );

still gives

error: no match for call to '(std:stream_iterator<foo, char,
std::char_traits<char> >) (foo&)'

with OS X 10.6.4, GCC 4.2.

No big deal, I'll create a custom print functor for foo.