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#ifndef RANGE_HELPERS_INL_H_
#error "Direct inclusion of this file is not allowed, include range_helpers.h"
// For the sake of sane code completion.
#include "range_helpers.h"
#endif
namespace NYT {
namespace NDetail {
////////////////////////////////////////////////////////////////////////////////
template <class TContainer>
struct TAppendTo
{ };
template <class TContainer>
requires requires (TContainer container, typename TContainer::value_type value) {
container.push_back(value);
}
struct TAppendTo<TContainer>
{
template <class TValue>
static void Append(TContainer& container, TValue&& value)
{
container.push_back(std::forward<TValue>(value));
}
};
template <class TContainer>
requires requires (TContainer container, typename TContainer::value_type value) {
container.insert(value);
}
struct TAppendTo<TContainer>
{
template <class TValue>
static void Append(TContainer& container, TValue&& value)
{
container.insert(std::forward<TValue>(value));
}
};
////////////////////////////////////////////////////////////////////////////////
template <class TContainer>
struct TRangeTo
{ };
template <class TContainer>
requires requires (TContainer container, typename TContainer::value_type value) {
TAppendTo<TContainer>::Append(container, value);
}
struct TRangeTo<TContainer>
{
template <std::ranges::input_range TRange>
static auto ToContainer(TRange&& range)
{
TContainer container;
if constexpr (requires { std::ranges::size(range); } &&
requires { container.reserve(std::declval<size_t>()); })
{
container.reserve(std::ranges::size(range));
}
for (auto&& element : range) {
TAppendTo<TContainer>::Append(container, std::forward<decltype(element)>(element));
}
return container;
}
template <class... TValues>
static auto StaticRangeToContainer(TValues... values)
{
TContainer container;
if constexpr (requires { container.reserve(std::declval<size_t>()); })
{
container.reserve(sizeof...(TValues));
}
(TAppendTo<TContainer>::Append(container, std::forward<TValues>(values)), ...);
return container;
}
};
////////////////////////////////////////////////////////////////////////////////
} // namespace NDetail
////////////////////////////////////////////////////////////////////////////////
template <std::ranges::range... TContainers>
auto ZipMutable(TContainers&&... containers) {
return Zip(std::ranges::views::transform(containers, [] <class T> (T&& t) {
return &t;
})...);
}
template <class TContainer, std::ranges::input_range TRange>
auto RangeTo(TRange&& range)
{
return NDetail::TRangeTo<TContainer>::template ToContainer<TRange>(std::forward<TRange>(range));
}
template <class TContainer>
constexpr auto RangeTo()
{
return NDetail::TRangeToTag<TContainer>();
}
template<std::ranges::input_range TRange, class TContainer>
auto operator|(TRange&& range, NDetail::TRangeToTag<TContainer>)
{
return RangeTo<TContainer>(std::forward<TRange>(range));
}
template <class TContainer, std::ranges::input_range TRange, class TTransformFunction>
auto TransformRangeTo(TRange&& range, TTransformFunction&& function)
{
return RangeTo<TContainer>(std::ranges::views::transform(
std::forward<TRange>(range),
std::forward<TTransformFunction>(function)));
}
template <class TContainer, class... TValues>
requires (std::constructible_from<typename TContainer::value_type, TValues> && ...)
TContainer StaticRangeTo(TValues... values)
{
return NDetail::TRangeTo<TContainer>::template StaticRangeToContainer<TValues...>(std::forward<TValues>(values)...);
}
template <class... TValues>
struct TStaticRange
{
public:
explicit TStaticRange(TValues... values)
: Tuple_(std::forward<TValues>(values)...)
{ }
template <class TContainer>
operator TContainer() &&
{
return std::apply(&StaticRangeTo<TContainer, TValues...>, std::move(Tuple_));
}
private:
std::tuple<TValues...> Tuple_;
};
template <std::ranges::range TRange, class TOperation, class TProjection>
auto FoldRange(TRange&& range, TOperation operation, TProjection projection)
{
auto iter = range.begin();
if (iter == range.end()) {
return std::remove_cvref_t<decltype(std::invoke(projection, *iter))>{};
}
auto accumulator = std::invoke(projection, *iter);
for (++iter; iter != range.end(); ++iter) {
accumulator = std::invoke(operation, accumulator, std::invoke(projection, *iter));
}
return accumulator;
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
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