The indirect_semigroup_ concept.  
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#include <range/v3/numeric/partial_sum.hpp>
template<typename I, typename BOp>
        indirectly_regular_binary_invocable_<
            composed<coerce<iter_value_t<I>>, BOp>,
            iter_value_t<I>*, I>  
The indirect_semigroup_ concept.
Definition: partial_sum.hpp:61
The indirect_semigroup_ concept.