id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4009,lexical_cast to multimember object fails,Darko Veberic <darko.veberic@…>,nasonov,"According to the documentation, the only relevant requirement for the lexical_cast<target>(source) is that the target is input-streamable. Having a simple class
{{{
struct Foo {
  int fA;
  int fB;
};
}}}
with input operator
{{{
istream&
operator>>(istream& is, Foo& f)
{
  return is >> f.fA >> f.fB;
}
}}}
should satisfy all the requirements. Nevertheless, the code
{{{
const string s = ""137 13"";
const Foo f = lexical_cast<Foo>(s);
}}}
compiles without any warnings (g++ 4.4.1) but eventually throws a bad_lexical_cast exception. Of course, using a non-optimized non-boost version of the lexical cast
{{{
template<typename T, typename U>
T
LexicalCast(const U& u)
{
  stringstream ss;
  ss << u;
  T t;
  if (ss >> t)
    return t;
  else
    throw bad_lexical_cast();
}
}}}
works fine for the class in the example above. Are there additional requirements on the target type that are not mentioned in the documentation or is this a really severe bug?",Bugs,closed,Boost 1.43.0,lexical_cast,Boost 1.40.0,Not Applicable,fixed,,darko.veberic@…