[boost] [Boost-bugs] [ boost-Bugs-1518640 ] bug in boost:format

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-07-07 06:07:38

Bugs item #1518640, was opened at 2006-07-07 13:07
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Category: function
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: AndreiMS (andreims)
Assigned to: Douglas Gregor (dgregor)
Summary: bug in boost:format

Initial Comment:
Hello,

software configuration:
boost 1.33.1
stlport 5.0

example:
std::string ret = boost::str(boost::format("%1%") %  
std::string(""));

If you try to send as first argument the empty string
to %-operator then you catch assertion failure in stl 
code:

STLport-5.0.0\stlport\stl/debug/_string.h(308): STL 
error : Invalid argument to operation (see operation 
documentation)
STLport-5.0.0\stlport\stl/debug/_string.h(308): STL 
assertion failure:     (__s != 0) 
 

The null-pointer argument is passed from this:

boost/boost/format/feed_args.hpp

namespace boost {
namespace io {
namespace detail {

    template<class Ch, class Tr, class Alloc>
    void mk_str( std::basic_string<Ch,Tr, Alloc> & 
res, 
                 const Ch * beg,
                 typename 
std::basic_string<Ch,Tr,Alloc>::size_type size,
                 std::streamsize w, 
                 const Ch fill_char,
                 std::ios_base::fmtflags f, 
                 const Ch prefix_space, // 0 if no 
space-padding
                 bool center) 
    // applies centered/left/right  padding  to the 
string  [beg, beg+size[
    // Effects : the result is placed in res.
    {
        typedef typename 
std::basic_string<Ch,Tr,Alloc>::size_type size_type;
        res.resize(0);
        if(w<=0 || static_cast<size_type>(w) <=size) {
            // no need to pad.
            res.reserve(size + !!prefix_space);
            if(prefix_space) 
              res.append(1, prefix_space);
            res.append(beg, size);  ///  here "beg" is 
null
        }
...

////////////////////--------------------------

There is no assertion failure if you pass empty string 
as second argument, 
e.g.
std::string ret = boost::str(boost::format("%1% %2%") 
% 2 % std::string(""));

Best regards,
          Andrei Selikhanovich

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