119 lines
2.7 KiB
C++
119 lines
2.7 KiB
C++
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/*
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Copyright 2019 Glen Joseph Fernandes
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(glenjofe@gmail.com)
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Distributed under the Boost Software License, Version 1.0.
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(http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_IO_OSTREAM_JOINER_HPP
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#define BOOST_IO_OSTREAM_JOINER_HPP
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#include <boost/config.hpp>
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#include <ostream>
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#include <string>
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
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#include <type_traits>
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#endif
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#include <utility>
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#endif
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namespace boost {
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namespace io {
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namespace detail {
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#if !defined(BOOST_NO_CXX11_ADDRESSOF)
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template<class T>
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inline T*
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osj_address(T& o)
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{
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return std::addressof(o);
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}
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#else
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template<class T>
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inline T*
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osj_address(T& obj)
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{
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return &obj;
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}
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#endif
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} /* detail */
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template<class Delim, class Char = char,
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class Traits = std::char_traits<Char> >
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class ostream_joiner {
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public:
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typedef Char char_type;
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typedef Traits traits_type;
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typedef std::basic_ostream<Char, Traits> ostream_type;
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typedef std::output_iterator_tag iterator_category;
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typedef void value_type;
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typedef void difference_type;
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typedef void pointer;
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typedef void reference;
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ostream_joiner(ostream_type& output, const Delim& delim)
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: output_(detail::osj_address(output))
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, delim_(delim)
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, first_(true) { }
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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ostream_joiner(ostream_type& output, Delim&& delim)
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: output_(detail::osj_address(output))
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, delim_(std::move(delim))
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, first_(true) { }
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#endif
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template<class T>
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ostream_joiner& operator=(const T& value) {
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if (!first_) {
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*output_ << delim_;
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}
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first_ = false;
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*output_ << value;
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return *this;
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}
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ostream_joiner& operator*() BOOST_NOEXCEPT {
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return *this;
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}
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ostream_joiner& operator++() BOOST_NOEXCEPT {
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return *this;
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}
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ostream_joiner& operator++(int) BOOST_NOEXCEPT {
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return *this;
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}
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private:
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ostream_type* output_;
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Delim delim_;
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bool first_;
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};
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
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!defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
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template<class Char, class Traits, class Delim>
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inline ostream_joiner<typename std::decay<Delim>::type, Char, Traits>
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make_ostream_joiner(std::basic_ostream<Char, Traits>& output, Delim&& delim)
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{
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return ostream_joiner<typename std::decay<Delim>::type, Char,
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Traits>(output, std::forward<Delim>(delim));
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}
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#else
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template<class Char, class Traits, class Delim>
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inline ostream_joiner<Delim, Char, Traits>
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make_ostream_joiner(std::basic_ostream<Char, Traits>& output,
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const Delim& delim)
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{
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return ostream_joiner<Delim, Char, Traits>(output, delim);
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}
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#endif
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} /* io */
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} /* boost */
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#endif
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