The function seekp(pos_type) fails on an empty stream,
even when the target position is the value returned
by tellp.
---------------------------------------
#include <ostream>
#include <sstream>
#include <iostream>
int
main()
{
std::ios::pos_type const
err = std::ios::pos_type( std::ios::off_type( -1 ) ) ;
std::ostringstream os ;
std::ios::pos_type pos = os.tellp() ;
if ( pos == err ) {
std::cout << "tell failed" << std::endl ;
} else {
os.seekp( pos ) ;
if ( ! os ) {
std::cout << "seek failed" << std::endl ;
}
}
return 0 ;
}
---------------------------------------
Outputs "seek failed". According to the standard,
seekp() calls seekpos() in stringbug, which can
only fail (here) if the position is invalide.
And tellp() cannot return an invalide position
other than -1 (correctly casted).
--
Summary: Error when seeking on an ostringstream
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jkanze at cheuvreux dot com
GCC build triplet: sparc-sun-solaris2.8
GCC host triplet: sparc-sun-solaris2.8
GCC target triplet: sparc-sun-solaris2.8
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29354
