/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 */

#pragma once

#include <functional>

#include <vector>

#include "kahan.hxx"

namespace sc::op {

template<typename T, typename tRes>

struct Op_

{

    const double mInitVal;

    const T maOp;

    Op_(double InitVal, T aOp):

        mInitVal(InitVal), maOp(std::move(aOp))

    {

    }

    void operator()(tRes& rAccum, double fVal) const

    {

        maOp(rAccum, fVal);

    }

};

using Op = Op_<std::function<void(double&, double)>, double>;

using kOp = Op_<std::function<void(KahanSum&, double)>, KahanSum>;

void fkOpSum(KahanSum& rAccum, double fVal);

void fkOpSumSquare(KahanSum& rAccum, double fVal);

extern kOp kOpSum;

extern kOp kOpSumSquare;

extern std::vector<kOp> kOpSumAndSumSquare;

struct Sum

{

    static const double InitVal;

    void operator()(KahanSum& rAccum, double fVal) const;

};

struct SumSquare

{

    static const double InitVal;

    void operator()(KahanSum& rAccum, double fVal) const;

};

struct Product

{

    static const double InitVal;

    void operator()(double& rAccum, double fVal) const;

};

}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */