boost::shared_ptr<std::ofstream> don't write to file

[Meir Yanovich]

Hello all
im using boost::shared_ptr to init std::ofstream in it
im declaring it as static :
the .h file :

typedef boost::shared_ptr<std::ofstream> OFStreamPtrType;

class Foo {

static OFStreamPtrType iStream;



}

then in the cpp file :

OFStreamPtrType Utilities::iStream(new ofstream("mylog.txt",ios::app));

Foo::printLog(string s){

if (Foo::iStream->is_open())
{
Foo::iStream << c <<".\n";
}

}

no its opening the file mylog.txt but it is not writing any thing to it
why ?

[Igor R.]

no its opening the file mylog.txt but it is not writing any thing to it> why ?

probably, you test it before it flushes?
try to flush() your stream, or disable buffering (oStream->rdbuf()->pubsetbuf(0, 0);)
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[Steven Watanabe]

AMDG

Post by Meir Yanovich
typedef boost::shared_ptr<std::ofstream> OFStreamPtrType;
class Foo {
static OFStreamPtrType iStream;
}
OFStreamPtrType Utilities::iStream(new ofstream("mylog.txt",ios::app));
Foo::printLog(string s){
if (Foo::iStream->is_open())
{
Foo::iStream << c <<".\n";
}
}
no its opening the file mylog.txt but it is not writing any thing to it
why ?

It might help to dereference the pointer.

*Foo::iStream << c <<".\n";


In Christ,
Steven Watanabe

[Igor R.]

It might help to dereference the pointer.> > *Foo::iStream << c <<".\n";> >

I thought he just misstyped it in this example. Is there the operator << (shared_ptr<...>, const string&) ?!
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[Meir Yanovich]

when im doing *Foo::iStream << c <<".\n";
im getting
error C2100: illegal indirection

Post by Igor R.

Post by Steven Watanabe
It might help to dereference the pointer.
*Foo::iStream << c <<".\n";

I thought he just misstyped it in this example. Is there the operator <<
(shared_ptr<...>, const string&) ?!
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[Igor R.]

You probably didn't put here the *exact* code that you test.Anyway: apply << operator to the stream, not to the pointer or shared_ptr; ensure you flushed the stream.> > when im doing *Foo::iStream << c <<".\n";> im getting> error C2100: illegal indirection>
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[Meir Yanovich]

Thanks its working now
can you please explain me in short what is the benefits of boost::shared_ptr?
thanks

Post by Igor R.
You probably didn't put here the *exact* code that you test.
Anyway: apply << operator to the stream, not to the pointer or shared_ptr;
ensure you flushed the stream.

Post by Meir Yanovich
when im doing *Foo::iStream << c <<".\n";
im getting
error C2100: illegal indirection

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[Kevin Martin]

Post by Meir Yanovich
when im doing *Foo::iStream << c <<".\n";
im getting
error C2100: illegal indirection

I think this code is roughly equivalent to what you're trying to do,
and it compiles with both g++ and icc. Test if you can compile this,
if so your problem is somewhere else.

#include <boost/shared_ptr.hpp>
#include <sstream>
#include <iostream>
#include <ostream>

class X
{
public:
static boost::shared_ptr<std::ostringstream> x;
static void init_stream();
};

boost::shared_ptr<std::ostringstream> X::x;

void X::init_stream() {
boost::shared_ptr<std::ostringstream> temp(new std::ostringstream);
x.swap(temp);
}

int main() {
X::init_stream();

*X::x << "Hello" << std::flush;

std::cout << X::x->str() << std::endl;
return 0;
}