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/*
This file is part of cpp-ethereum.
cpp-ethereum is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
cpp-ethereum is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file QBigInt.h
* @author Yann yann@ethdev.com
* @date 2015
* Represent a big integer (u256, bigint) to be used in QML.
*/
#pragma once
#include "boost/variant.hpp"
#include "boost/variant/multivisitors.hpp"
#include <QObject>
#include <QQmlEngine>
#include <libdevcore/CommonJS.h>
#include <libdevcore/Common.h>
using namespace dev;
namespace dev
{
namespace mix
{
using BigIntVariant = boost::variant<dev::u256, dev::bigint>;
struct add: public boost::static_visitor<BigIntVariant>
{
template<class T1, class T2>
BigIntVariant operator()(T1 const& _value, T2 const& _otherValue) const { return _value + _otherValue; }
};
struct subtract: public boost::static_visitor<BigIntVariant>
{
template<class T1, class T2>
BigIntVariant operator()(T1 const& _value, T2 const& _otherValue) const { return _value - _otherValue; }
};
struct multiply: public boost::static_visitor<BigIntVariant>
{
template<class T1, class T2>
BigIntVariant operator()(T1 const& _value, T2 const& _otherValue) const { return _value * _otherValue; }
};
struct divide: public boost::static_visitor<BigIntVariant>
{
template<class T1, class T2>
BigIntVariant operator()(T1 const& _value, T2 const& _otherValue) const { return _value / _otherValue; }
};
/*
* Represent big integer like big int and u256 in QML.
* The ownership is set by default to Javascript.
*/
class QBigInt: public QObject
{
Q_OBJECT
public:
QBigInt(QObject* _parent = 0): QObject(_parent), m_internalValue(dev::u256(0)) { QQmlEngine::setObjectOwnership(this, QQmlEngine::JavaScriptOwnership); }
QBigInt(dev::u256 const& _value, QObject* _parent = 0): QObject(_parent), m_internalValue(_value) { QQmlEngine::setObjectOwnership(this, QQmlEngine::JavaScriptOwnership); }
QBigInt(dev::bigint const& _value, QObject* _parent = 0): QObject(_parent), m_internalValue(_value) { QQmlEngine::setObjectOwnership(this, QQmlEngine::JavaScriptOwnership); }
QBigInt(BigIntVariant const& _value, QObject* _parent = 0): QObject(_parent), m_internalValue(_value){ QQmlEngine::setObjectOwnership(this, QQmlEngine::JavaScriptOwnership); }
~QBigInt() {}
/// @returns the current used big integer.
BigIntVariant internalValue() { return m_internalValue; }
/// @returns a string representation of the big integer used. Invokable from QML.
Q_INVOKABLE QString value() const;
/// Set the value of the BigInteger used. Will use u256 type. Invokable from QML.
Q_INVOKABLE void setValue(QString const& _value) { m_internalValue = dev::jsToU256(_value.toStdString()); }
/// Subtract by @a _value. Invokable from QML.
Q_INVOKABLE QBigInt* subtract(QBigInt* const& _value) const;
/// Add @a _value to the current big integer. Invokable from QML.
Q_INVOKABLE QBigInt* add(QBigInt* const& _value) const;
/// Multiply by @a _value. Invokable from QML.
Q_INVOKABLE QBigInt* multiply(QBigInt* const& _value) const;
/// divide by @a _value. Invokable from QML.
Q_INVOKABLE QBigInt* divide(QBigInt* const& _value) const;
protected:
BigIntVariant m_internalValue;
};
}
}