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#ifndef WRITER_H
#define WRITER_H
#include <iostream>
struct Writer
{
template <class Ch, class Tr,class value_type>
std::basic_ostream<Ch,Tr>&
operator()(std::basic_ostream<Ch,Tr>& o,const value_type &l) const {
return o << l;
}
};
struct LineWriter
{
template <class Ch, class Tr,class Label>
std::basic_ostream<Ch,Tr>&
operator()(std::basic_ostream<Ch,Tr>& o,const Label &l) const {
return o << l << std::endl;
}
};
template <class O, class T,class W> inline
std::ios_base::iostate write_range_iostate(O& o,T begin, T end,W writer,bool multiline=false,bool parens=true,char open_paren='(',char close_paren=')',char space=' ')
{
static const char *const MULTILINE_SEP="\n";
if (parens) {
o << open_paren;
if (multiline)
o << MULTILINE_SEP;
}
if (multiline) {
for (;begin!=end;++begin) {
o << space;
writer(o,*begin);
o << MULTILINE_SEP;
}
} else {
for (T i=begin;i!=end;++i) {
if (i!=begin) o<<space;
writer(o,*i);
}
}
if (parens) {
o << close_paren;
if (multiline)
o << MULTILINE_SEP;
}
return std::ios_base::goodbit;
}
template <class Ib,class Ie,class W=Writer>
struct range_formatter {
Ib i;
Ie e;
W w;
bool multiline;
bool parens;
range_formatter(Ib i,Ie e,W w=W(),bool multiline=false,bool parens=true) :
i(i),e(e),w(w),multiline(multiline),parens(parens) {}
template <class Ch, class Tr>
std::basic_ostream<Ch,Tr> &
operator()(std::basic_ostream<Ch,Tr> &o) const {
write_range_iostate(o,i,e,w,multiline,parens);
return o;
}
template <class Ch, class Tr>
friend inline
std::basic_ostream<Ch,Tr> &
operator<<(std::basic_ostream<Ch,Tr> &o,range_formatter<Ib,Ie,W> const& w) {
return w(o);
}
};
template <class Ib,class Ie,class W>
range_formatter<Ib,Ie,W>
wrange(Ib i,Ie e,W const& w,bool multiline=false,bool parens=true)
{
return range_formatter<Ib,Ie,W>(i,e,w,multiline,parens);
}
template <class Ib,class Ie>
range_formatter<Ib,Ie>
prange(Ib i,Ie e,bool multiline=false,bool parens=true)
{
return range_formatter<Ib,Ie,Writer>(i,e,Writer(),multiline,parens);
}
template <class Ch, class Tr, class T,class W> inline
std::basic_ostream<Ch,Tr> & write_range(std::basic_ostream<Ch,Tr>& o,T begin, T end,W writer,bool multiline=false,bool parens=true,char open_paren='(',char close_paren=')')
{
write_range_iostate(o,begin,end,writer,multiline,parens,open_paren,close_paren);
return o;
}
template <class O, class T>
inline std::ios_base::iostate print_range(O& o,T begin,T end,bool multiline=false,bool parens=true,char open_paren='(',char close_paren=')') {
return write_range_iostate(o,begin,end,Writer(),multiline,parens,open_paren,close_paren);
}
template <class O, class C>
inline std::ios_base::iostate print_range_i(O& o,C const&c,unsigned from,unsigned to,bool multiline=false,bool parens=true,char open_paren='(',char close_paren=')') {
return write_range_iostate(o,c.begin()+from,c.begin()+to,Writer(),multiline,parens,open_paren,close_paren);
}
template <class O>
struct bound_printer
{
O *po;
template <class T>
void operator()(T const& t) const
{
*po << t;
}
};
template <class O>
bound_printer<O>
make_bound_printer(O &o)
{
bound_printer<O> ret;
ret.po=&o;
return ret;
}
template <class W>
struct bound_writer
{
W const& w;
bound_writer(W const& w) : w(w) {}
bound_writer(bound_writer const& o) :w(o.w) {}
template <class O,class V>
void operator()(O &o,V const& v) const
{
v.print(o,w);
}
};
template <class W>
bound_writer<W>
make_bound_writer(W const& w)
{
return bound_writer<W>(w);
}
#endif
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