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◆ main openmsx / src / utils / join.hh
1.2 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#ifndef JOIN_HH
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#define JOIN_HH
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#include "strCat.hh"
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#include <iterator>
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#include <string>
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#include <utility>
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namespace detail {
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template<typename Collection, typename Separator>
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class Joiner
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{
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public:
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	Joiner(Collection&& col_, Separator&& sep_)
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		: col(std::forward<Collection>(col_))
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		, sep(std::forward<Separator>(sep_))
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	{
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	}
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	[[nodiscard]] operator std::string() const
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	{
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		std::string result;
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		auto first = std::begin(col);
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		auto last  = std::end  (col);
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		if (first != last) {
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			result = strCat(*first);
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			++first;
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			while (first != last) {
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				strAppend(result, sep, *first);
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				++first;
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			}
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		}
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		return result;
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	}
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private:
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	Collection col;
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	Separator sep;
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};
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} // namespace detail
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// to enable strCat()
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template<typename Col, typename Sep> struct strCatImpl::ConcatUnit<detail::Joiner<Col, Sep>>
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	: public strCatImpl::ConcatViaString
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{
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	explicit ConcatUnit(const detail::Joiner<Col, Sep>& joiner)
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		: strCatImpl::ConcatViaString(std::string(joiner)) {}
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};
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template<typename Collection, typename Separator>
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[[nodiscard]] detail::Joiner<Collection, Separator> join(Collection&& col, Separator&& sep)
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{
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	return { std::forward<Collection>(col), std::forward<Separator>(sep) };
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}
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#endif