std::mergeable - [alg.req.mergeable], concept mergeable

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                                                    libstdc++                               std::mergeable(3cxx)

       template<typename _I1, typename _I2, typename _Out, typename _Rel ranges::less, typename _P1 identity, typename _P2 identity>
       concept std::mergeable =  input_iterator<_I1> && input_iterator<_I2>
             && weakly_incrementable<_Out> && indirectly_copyable<_I1, _Out>
             && indirectly_copyable<_I2, _Out>
             && indirect_strict_weak_order<_Rel, projected<_I1, _P1>,
                                           projected<_I2, _P2>>

       [alg.req.mergeable], concept mergeable

       std::mergeable - [alg.req.mergeable], concept mergeable

       #include <iterator>