change in typedef stringstream_type in format_date_parser.hpp causing compilation error

[anonymous]

In format_date_parser.hpp, the typedef stringstream_type (in class format_date_parser) was defined as

std::basic_stringstream<charT>

in boost-1.33.0 but now has changed to

std::basic_ostringstream<charT>

in boost-1.34.1. This change now causes compilation error to any call to the function ->

date_type
parse_date(const string_type& value,

const string_type& format_str,
const special_values_parser<date_type,charT>& sv_parser) const

{

stringstream_type ss;
ss << value;
stream_itr_type sitr(ss); THIS ERROR IS IN THIS LINE !!

stream_itr_type stream_end;
return parse_date(sitr, stream_end, format_str, sv_parser);

}

The compiler error (for boost-1.34.1) is ->

format_date_parser.hpp:221: error: invalid conversion from `void*' to `std::basic_streambuf<char, std::char_traits<char> >*'

and is observed with multiple versions of gcc (3.4.x and 4.x).

Here's a simple example ->

#include <sstream>
int main()
{
  typedef std::basic_ostringstream<char>  stringstream_type;
  typedef std::istreambuf_iterator<char> stream_itr_type;

stringstream_type ss;
stream_itr_type itr(ss);
return 0;
}

The above program does not compile unless stringstream_type is changed to std::basic_stringstream<char>.

[michael.schumacher@…]

I encountered the same error messsage when compiling with VC90 (MS Visual Studio 2008) and boost_1_35_0. After changing stringstream_type back to typedef std::basic_stringstream<char> (as in boost_1_33_1), it compiles again.

[anonymous]

Hi,

This bug seems to be still part of the 1.37.0 version of boost.

1.37.0_gcc4.3.2include/boost-1_37/boost/date_time/format_date_parser.hpp: In member function 'date_type boost::date_time::format_date_parser<date_type, charT>::parse_date(const std::basic_string<OutputT, std::char_traits<_CharT>, std::allocator<_T2> >&, const std::basic_string<OutputT, std::char_traits<_CharT>, std::allocator<_T2> >&, const boost::date_time::special_values_parser<date_type, charT>&) const [with date_type = boost::gregorian::date, charT = char]': Utilities.cpp:474: instantiated from here /1.37.0_gcc4.3.2include/boost-1_37/boost/date_time/format_date_parser.hpp:221: error: invalid conversion from 'void*' to 'std::basic_streambuf<char, std::char_traits<char> >*' /sbcimp/run/pd/boost/64-bit/1.37.0_gcc4.3.2include/boost-1_37/boost/date_time/format_date_parser.hpp:221: error: initializing argument 1 of 'std::istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]'

Ramesh

[Andrey Semashev]

1.37 did not include the fix. It is fixed in trunk and should go into 1.38. Please, check the recent checkout from branches/release.