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    std::experimental::ranges:: Mergeable

    From ja.cppreference.net
    C++
    Experimental
    Ranges
    Iterators library
    Iterator concepts
    Indirect callable concepts
    Common algorithm requirements
    Concept utilities
    Iterator utilities and operations
    Iterator traits
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    Stream iterators
    template < class I1, class I2, class Out, class R = ranges:: less <> ,

    class P1 = ranges:: identity , class P2 = ranges:: identity >
    concept bool Mergeable =
    InputIterator < I1 > &&
    InputIterator < I2 > &&
    WeaklyIncrementable < Out > &&
    IndirectlyCopyable < I1, Out > &&
    IndirectlyCopyable < I2, Out > &&

    IndirectStrictWeakOrder < R, ranges :: projected < I1, P1 > , ranges :: projected < I2, P2 >> ;
    		(ranges TS)

    Mergeable コンセプトは、ソートされたシーケンスを要素のコピーによって出力シーケンスにマージするアルゴリズム（例えば ranges::merge など）の共通要件を規定します。