#pragma once

#include <DB/AggregateFunctions/IAggregateFunction.h>

namespace DB
{

template <typename T, typename Derived>
class IBinaryAggregateFunction : public IAggregateFunctionHelper<T>
{
	Derived & getDerived() { return static_cast<Derived &>(*this); }
	const Derived & getDerived() const { return static_cast<const Derived &>(*this); }

public:
	void setArguments(const DataTypes & arguments)
	{
		if (arguments.size() != 2)
			throw Exception{
				"Passed " + toString(arguments.size()) + " arguments to binary aggregate function " + this->getName(),
					ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH
			};

		getDerived().setArgumentsImpl(arguments);
	}

	void add(AggregateDataPtr place, const IColumn ** columns, const size_t row_num) const
	{
		getDerived().addOne(place, *columns[0], *columns[1], row_num);
	}
};

}