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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#ifndef FUNCTIONS_H
#define FUNCTIONS_H
#include <QList>
#include <vector>
bool keepEvenIntegers(const int &x)
{
return (x & 1) == 0;
}
class KeepEvenIntegers
{
public:
bool operator()(const int &x)
{
return (x & 1) == 0;
}
};
class KeepEvenIntegersMoveOnly
{
public:
KeepEvenIntegersMoveOnly() = default;
KeepEvenIntegersMoveOnly(KeepEvenIntegersMoveOnly &&) = default;
KeepEvenIntegersMoveOnly &operator=(KeepEvenIntegersMoveOnly &&other) = default;
KeepEvenIntegersMoveOnly(const KeepEvenIntegersMoveOnly &) = delete;
KeepEvenIntegersMoveOnly &operator=(const KeepEvenIntegersMoveOnly &) = delete;
bool operator()(int x) { return (x & 1) == 0; }
};
class Number
{
int n;
public:
Number()
: n(0)
{ }
Number(int n)
: n(n)
{ }
void multiplyBy2()
{
n *= 2;
}
Number multipliedBy2() const
{
return n * 2;
}
bool isEven() const
{
return (n & 1) == 0;
}
int toInt() const
{
return n;
}
QString toString() const
{
return QString::number(n);
}
Number squared() const
{
return Number(n * n);
}
bool operator==(const Number &other) const
{
return n == other.n;
}
};
bool keepEvenNumbers(const Number &x)
{
return (x.toInt() & 1) == 0;
}
class KeepEvenNumbers
{
public:
bool operator()(const Number &x)
{
return (x.toInt() & 1) == 0;
}
};
void intSumReduce(int &sum, int x)
{
sum += x;
}
class IntSumReduce
{
public:
void operator()(int &sum, int x)
{
sum += x;
}
};
class IntSumReduceMoveOnly
{
public:
IntSumReduceMoveOnly() = default;
IntSumReduceMoveOnly(IntSumReduceMoveOnly &&) = default;
IntSumReduceMoveOnly &operator=(IntSumReduceMoveOnly &&other) = default;
IntSumReduceMoveOnly(const IntSumReduceMoveOnly &) = delete;
IntSumReduceMoveOnly &operator=(const IntSumReduceMoveOnly &) = delete;
void operator()(int &sum, int x) { sum += x; }
};
void numberSumReduce(int &sum, const Number &x)
{
sum += x.toInt();
}
class NumberSumReduce
{
public:
void operator()(int &sum, const Number &x)
{
sum += x.toInt();
}
};
template<typename T>
class MoveOnlyVector
{
public:
using value_type = T;
// rule of six
MoveOnlyVector() = default;
~MoveOnlyVector() = default;
MoveOnlyVector(MoveOnlyVector<T> &&other) = default;
MoveOnlyVector &operator=(MoveOnlyVector<T> &&other) = default;
MoveOnlyVector(const MoveOnlyVector<T> &) = delete;
MoveOnlyVector &operator=(const MoveOnlyVector<T> &) = delete;
// convenience for creation
explicit MoveOnlyVector(const std::vector<T> &v) : data(v) { }
void push_back(T &&el) { data.push_back(el); }
void push_back(const T &el) { data.push_back(el); }
// minimal interface to be usable as a Sequence in QtConcurrent
typedef typename std::vector<T>::const_iterator const_iterator;
typedef typename std::vector<T>::iterator iterator;
const_iterator cbegin() const { return data.cbegin(); }
const_iterator cend() const { return data.cend(); }
iterator begin() { return data.begin(); }
iterator end() { return data.end(); }
const_iterator begin() const { return data.cbegin(); }
const_iterator end() const { return data.cend(); }
bool operator==(const MoveOnlyVector<T> &other) const { return data == other.data; }
private:
std::vector<T> data;
};
struct NonTemplateSequence : public QList<int>
{
NonTemplateSequence() = default;
NonTemplateSequence(std::initializer_list<int> args) : QList(args) { }
};
#endif
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