boost::shared_ptr<std::ofstream> don't write to file
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 ?
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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AMDG Meir Yanovich wrote:
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 ?
It might help to dereference the pointer. *Foo::iStream << c <<".\n"; In Christ, 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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when im doing *Foo::iStream << c <<".\n"; im getting error C2100: illegal indirection On Wed, May 21, 2008 at 5:13 PM, Igor R. <igor_rubinov@hotmail.com> wrote:
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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On 21 May 2008, at 15:28, Meir Yanovich wrote:
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; }
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> _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx
Thanks its working now can you please explain me in short what is the benefits of boost::shared_ptr? thanks On Wed, May 21, 2008 at 5:46 PM, Igor R. <igor_rubinov@hotmail.com> wrote:
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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participants (4)
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Igor R. -
Kevin Martin -
Meir Yanovich -
Steven Watanabe