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324.1.1
by Mats Kindahl
Adding specification of a simple protobuf-based binary log format, |
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// -*- Mode: C++ -*-
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#include <iosfwd> |
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#include <string> |
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namespace ioutil { |
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/**
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Helper class for join() I/O manipulator.
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This is a join I/O manipulator with arguments for @c join(). These has to be
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*/
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template <class FwdIter> class joiner { |
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friend std::ostream& operator<<(std::ostream& out, const joiner& j) { |
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j.write(out); |
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return out; |
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}
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public: |
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explicit joiner(const std::string& separator, FwdIter start, FwdIter finish) |
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: m_sep(separator), m_start(start), m_finish(finish) |
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{ } |
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private: |
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std::string m_sep; |
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FwdIter m_start, m_finish; |
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void write(std::ostream& out) const { |
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if (m_start == m_finish) |
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return; |
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FwdIter fi = m_start; |
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while (true) { |
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out << *fi; |
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if (++fi == m_finish) |
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break; |
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out << m_sep; |
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}
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}
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};
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/**
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Join manipulators for writing delimiter-separated strings to an
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ostream object.
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Use the manipulator as follows:
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@code
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std::cout << ioutil::join(",", list.begin(), list.end()) << std::endl;
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std::cout << ioutil::join(",", list) << std::endl;
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@endcode
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*/
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template <class FwdIter> |
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joiner<FwdIter> |
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join(const std::string& delim, FwdIter start, FwdIter finish) { |
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return joiner<FwdIter>(delim, start, finish); |
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}
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/** @overload */
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template <class Container> |
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joiner<typename Container::const_iterator> |
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join(const std::string& delim, Container seq) { |
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typedef typename Container::const_iterator FwdIter; |
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return joiner<FwdIter>(delim, seq.begin(), seq.end()); |
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}
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}
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