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are used: each must be covered by potentially different specializations).
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Having available a trait class, the actual type can be inferred compile
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pointer, a pointer to a member, or a const pointer, and to make comparable
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hi(generic algorithms: required types)
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ti(argument_type), ti(first_argument_type), ti(second_argument_type) and
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ti(result_type), which are required by several generic algorithms (e.g.,