ClickHouse/base/ext/collection_cast.h
2020-02-14 17:48:30 +03:00

25 lines
885 B
C++

#pragma once
#include <iterator>
namespace ext
{
/** \brief Returns collection of specified container-type.
* Retains stored value_type, constructs resulting collection using iterator range. */
template <template <typename...> class ResultCollection, typename Collection>
auto collection_cast(const Collection & collection)
{
using value_type = typename Collection::value_type;
return ResultCollection<value_type>(std::begin(collection), std::end(collection));
}
/** \brief Returns collection of specified type.
* Performs implicit conversion of between source and result value_type, if available and required. */
template <typename ResultCollection, typename Collection>
auto collection_cast(const Collection & collection)
{
return ResultCollection(std::begin(collection), std::end(collection));
}
}