Re: [Boost-users] boost::interprocess:basic_string : Capacity no more than 10

Subject: Re: [Boost-users] boost::interprocess:basic_string : Capacity no more than 10
From: samuel.gallard (samuel.gallard_at_[hidden])
Date: 2009-07-30 04:01:16

        I finally managed to find which was my error. In my class Element, I used a
constructor to copy an Element like this :

Element::Element (const Element& elem){
        try{
                this->dir.assign(elem.getDir());
                this->file.assign(elem.getFile());
                this->type.assign(elem.getType());
        }
        catch(ip::interprocess_exception &e){
                ostringstream oss;
                const std::string what(e.what());
                oss << "Class Element in constructor by recopy -> ";
                oss << what;
                throw EventException(oss.str().c_str(), __LINE__ );
        }
}

        If I put it in comment, I am able to use it without problems in
interprocess and define the ShmString with a length upper than 10. 

        But with threads (boost::thread), I am still limited to 10 if I used them
with this constructor. If it is more than 10, I obtained an error when I
create an element like this :

Element("/home/sdfqsd/","titi.txt",Request::st_change)

The error message is :

0xb7ca3283 in strlen () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0  0xb7ca3283 in strlen () from /lib/tls/i686/cmov/libc.so.6
#1  0x080600c9 in std::char_traits<char>::length (
    __s=0xb8aa1130 <Address 0xb8aa1130 out of bounds>)
    at /usr/include/c++/4.2/bits/char_traits.h:258
#2  0x0807c0bf in boost::interprocess::basic_string<char,
std::char_traits<char>, boost::interprocess::allocator<char,
boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family,
boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index>
> >::assign (this=0xb6bfb288, s=0xb8aa1130 <Address 0xb8aa1130 out of
bounds>)
    at /usr/local/include/boost/interprocess/containers/string.hpp:988
#3  0x08079b59 in Element (this=0xb6bfb280, elem=@0xb7f4f0d0)
    at ../Events/MessageQueue/Element.cpp:21

The line 21 in Element.cpp is the first line in the constructor by copy :

this->dir.assign(elem.getDir());

I don't understand why it works like that. If you could give me a clue, I
will appreciate.

About "doc_cont.cpp", it will be great to have the same example with a
vector of a class that contained basic_string attributes instead of a vector
of int. Because it is easy to understand with a basic type like int but a
little tricky to apply it to a custom type.

Regards

-- 
View this message in context: http://www.nabble.com/boost%3A%3Ainterprocess%3Abasic_string-%3A-Capacity-no-more-than-10-tp24675192p24733927.html
Sent from the Boost - Users mailing list archive at Nabble.com.