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// -*- Mode: C++ -*-
#include <iosfwd>
#include <string>
namespace ioutil {
/**
Helper class for join() I/O manipulator.
This is a join I/O manipulator with arguments for @c join(). These has to be
*/
template <class FwdIter> class joiner {
friend std::ostream& operator<<(std::ostream& out, const joiner& j) {
j.write(out);
return out;
}
public:
explicit joiner(const std::string& separator, FwdIter start, FwdIter finish)
: m_sep(separator), m_start(start), m_finish(finish)
{ }
private:
std::string m_sep;
FwdIter m_start, m_finish;
void write(std::ostream& out) const {
if (m_start == m_finish)
return;
FwdIter fi = m_start;
while (true) {
out << *fi;
if (++fi == m_finish)
break;
out << m_sep;
}
}
};
/**
Join manipulators for writing delimiter-separated strings to an
ostream object.
Use the manipulator as follows:
@code
std::cout << ioutil::join(",", list.begin(), list.end()) << std::endl;
std::cout << ioutil::join(",", list) << std::endl;
@endcode
*/
template <class FwdIter>
joiner<FwdIter>
join(const std::string& delim, FwdIter start, FwdIter finish) {
return joiner<FwdIter>(delim, start, finish);
}
/** @overload */
template <class Container>
joiner<typename Container::const_iterator>
join(const std::string& delim, Container seq) {
typedef typename Container::const_iterator FwdIter;
return joiner<FwdIter>(delim, seq.begin(), seq.end());
}
}
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