qt-creator/src/libs/utils/algorithm.h

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#ifndef ALGORITHM_H
#define ALGORITHM_H

#include <algorithm>

#include <qcompilerdetection.h> // for Q_REQUIRE_RESULT

namespace Utils
{

template<typename T, typename F>
bool anyOf(const T &container, F predicate)
{
    return std::any_of(container.begin(), container.end(), predicate);
}

template<typename T, typename F>
bool allOf(const T &container, F predicate)
{
    return std::all_of(container.begin(), container.end(), predicate);
}

template<typename T, typename F>
void erase(QList<T> &container, F predicate)
{
    container.erase(std::remove_if(container.begin(), container.end(), predicate),
                    container.end());
}

template<typename T, typename F>
bool contains(const T &container, F function)
{
    typename T::const_iterator end = container.end();
    typename T::const_iterator begin = container.begin();

    typename T::const_iterator it = std::find_if(begin, end, function);
    return it != end;
}

template<typename T, typename F>
typename T::value_type findOr(const T &container, typename T::value_type other, F function)
{
    typename T::const_iterator end = container.end();
    typename T::const_iterator begin = container.begin();

    typename T::const_iterator it = std::find_if(begin, end, function);
    if (it == end)
        return other;
    return *it;
}

template<typename T, typename F>
typename T::value_type bestElementOr(const T &container, typename T::value_type other, F function)
{
    typename T::const_iterator end = container.end();
    typename T::const_iterator begin = container.begin();

    typename T::const_iterator it = std::min_element(begin, end, function);
    if (it == end)
        return other;
    return *it;
}

// Note: add overloads for other container types as needed
template<typename T, typename F>
Q_REQUIRED_RESULT
auto transform(const QList<T> &container, F function) -> QList<decltype(function(T()))>
{
    QList<decltype(function(T()))> result;
    result.reserve(container.size());
    std::transform(container.begin(), container.end(),
                   std::back_inserter(result),
                   function);
    return result;
}

}

#endif // ALGORITHM_H