1// ----------------------------------------------------------------------------
2// free_funcs.hpp : implementation of the free functions of boost::format
3// ----------------------------------------------------------------------------
4
5// Copyright Samuel Krempp 2003. Use, modification, and distribution are
6// subject to the Boost Software License, Version 1.0. (See accompanying
7// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
8
9// See http://www.boost.org/libs/format for library home page
10
11// ----------------------------------------------------------------------------
12
13#ifndef BOOST_FORMAT_FUNCS_HPP
14#define BOOST_FORMAT_FUNCS_HPP
15
16#include <boost/format/format_class.hpp>
17#include <boost/throw_exception.hpp>
18
19namespace boost {
20
21 template<class Ch, class Tr, class Alloc> inline
22 std::basic_string<Ch, Tr, Alloc> str(const basic_format<Ch, Tr, Alloc>& f) {
23 // adds up all pieces of strings and converted items, and return the formatted string
24 return f.str();
25 }
26 namespace io {
27 using ::boost::str; // keep compatibility with when it was defined in this N.S.
28 } // - namespace io
29
30#ifndef BOOST_NO_TEMPLATE_STD_STREAM
31 template<class Ch, class Tr, class Alloc>
32 std::basic_ostream<Ch, Tr> &
33 operator<<( std::basic_ostream<Ch, Tr> & os,
34 const basic_format<Ch, Tr, Alloc>& f)
35#else
36 template<class Ch, class Tr, class Alloc>
37 std::ostream &
38 operator<<( std::ostream & os,
39 const basic_format<Ch, Tr, Alloc>& f)
40#endif
41 // effect: "return os << str(f);" but we can do it faster
42 {
43 typedef boost::basic_format<Ch, Tr, Alloc> format_t;
44 if(f.items_.size()==0)
45 os << f.prefix_;
46 else {
47 if(f.cur_arg_ < f.num_args_)
48 if( f.exceptions() & io::too_few_args_bit )
49 // not enough variables supplied
50 boost::throw_exception(e: io::too_few_args(f.cur_arg_, f.num_args_));
51 if(f.style_ & format_t::special_needs)
52 os << f.str();
53 else {
54 // else we dont have to count chars output, so we dump directly to os :
55 os << f.prefix_;
56 for(unsigned long i=0; i<f.items_.size(); ++i) {
57 const typename format_t::format_item_t& item = f.items_[i];
58 os << item.res_;
59 os << item.appendix_;
60 }
61 }
62 }
63 f.dumped_=true;
64 return os;
65 }
66
67} // namespace boost
68
69
70#endif // BOOST_FORMAT_FUNCS_HPP
71

source code of boost/boost/format/free_funcs.hpp