library CurrenciesLib {
    using SafeMathUintLib for uint256;

    //
    // Structures
    // -----------------------------------------------------------------------------------------------------------------
    struct Currencies {
        MonetaryTypesLib.Currency[] currencies;
        mapping(address => mapping(uint256 => uint256)) indexByCurrency;
    }

    //
    // Functions
    // -----------------------------------------------------------------------------------------------------------------
    function add(Currencies storage self, address currencyCt, uint256 currencyId)
    internal
    {
        // Index is 1-based
        if (0 == self.indexByCurrency[currencyCt][currencyId]) {
            self.currencies.push(MonetaryTypesLib.Currency(currencyCt, currencyId));
            self.indexByCurrency[currencyCt][currencyId] = self.currencies.length;
        }
    }

    function removeByCurrency(Currencies storage self, address currencyCt, uint256 currencyId)
    internal
    {
        // Index is 1-based
        uint256 index = self.indexByCurrency[currencyCt][currencyId];
        if (0 < index)
            removeByIndex(self, index - 1);
    }

    function removeByIndex(Currencies storage self, uint256 index)
    internal
    {
        require(index < self.currencies.length);

        address currencyCt = self.currencies[index].ct;
        uint256 currencyId = self.currencies[index].id;

        if (index < self.currencies.length - 1) {
            self.currencies[index] = self.currencies[self.currencies.length - 1];
            self.indexByCurrency[self.currencies[index].ct][self.currencies[index].id] = index + 1;
        }
        self.currencies.length--;
        self.indexByCurrency[currencyCt][currencyId] = 0;
    }

    function count(Currencies storage self)
    internal
    view
    returns (uint256)
    {
        return self.currencies.length;
    }

    function has(Currencies storage self, address currencyCt, uint256 currencyId)
    internal
    view
    returns (bool)
    {
        return 0 != self.indexByCurrency[currencyCt][currencyId];
    }

    function getByIndex(Currencies storage self, uint256 index)
    internal
    view
    returns (MonetaryTypesLib.Currency)
    {
        require(index < self.currencies.length);
        return self.currencies[index];
    }

    function getByIndices(Currencies storage self, uint256 low, uint256 up)
    internal
    view
    returns (MonetaryTypesLib.Currency[])
    {
        require(0 < self.currencies.length);
        require(low <= up);

        up = up.clampMax(self.currencies.length - 1);
        MonetaryTypesLib.Currency[] memory _currencies = new MonetaryTypesLib.Currency[](up - low + 1);
        for (uint256 i = low; i <= up; i++)
            _currencies[i - low] = self.currencies[i];

        return _currencies;
    }
}
/*
 * Hubii Nahmii
 *
 * Compliant with the Hubii Nahmii specification v0.12.
 *
 * Copyright (C) 2017-2018 Hubii AS
 */
function add(Currencies storage self, address currencyCt, uint256 currencyId)
    internal
    {
        // Index is 1-based
        if (0 == self.indexByCurrency[currencyCt][currencyId]) {
            self.currencies.push(MonetaryTypesLib.Currency(currencyCt, currencyId));
            self.indexByCurrency[currencyCt][currencyId] = self.currencies.length;
        }
    }
//
// Functions
// -----------------------------------------------------------------------------------------------------------------