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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#pragma once
#include <utils/algorithm.h>
namespace Utils {
//////// FIND
template<typename C, typename F>
[[nodiscard]] typename Utils::optional<typename C::value_type> findOptional(const C &container,
F function)
{
auto begin = std::cbegin(container);
auto end = std::cend(container);
auto it = std::find_if(begin, end, function);
return it == end ? nullopt : make_optional(*it);
}
template<typename C>
[[nodiscard]] bool containsItem(const C &container, const typename C::value_type &item)
{
auto begin = std::cbegin(container);
auto end = std::cend(container);
auto it = std::find(begin, end, item);
return it == end ? false : true;
}
///////// FILTER
template<typename C, typename T = typename C::value_type>
[[nodiscard]] C filterOut(const C &container, const T &value = T())
{
C out;
std::copy_if(std::begin(container), std::end(container), inserter(out), [&](const auto &item) {
return item != value;
});
return out;
}
template<typename C>
[[nodiscard]] C filtered(const C &container)
{
return filterOut(container, typename C::value_type{});
}
/////// MODIFY
template<typename SC, typename C>
void concat(C &out, const SC &container)
{
std::copy(std::begin(container), std::end(container), inserter(out));
}
template<typename C, typename T>
bool erase_one(C &container, const T &value)
{
typename C::const_iterator i = std::find(std::cbegin(container), std::cend(container), value);
if (i == std::cend(container))
return false;
container.erase(i);
return true;
}
template<typename C, typename T>
void prepend(C &container, const T &value)
{
container.insert(std::cbegin(container), value);
}
/////// OTHER
template<typename RC, typename SC>
[[nodiscard]] RC flatten(const SC &container)
{
RC result;
for (const auto &innerContainer : container)
concat(result, innerContainer);
return result;
}
template<template<typename, typename...> class C,
typename T,
typename... TArgs,
typename RT = typename std::decay_t<T>::value_type,
typename RC = C<RT>>
[[nodiscard]] auto flatten(const C<T, TArgs...> &container)
{
using SC = C<T, TArgs...>;
return flatten<RC, SC>(container);
}
} // namespace Utils
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