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Sprout/sprout/range/adaptor/transformed.hpp
2013-02-20 02:23:20 +09:00

207 lines
6.5 KiB
C++

#ifndef SPROUT_RANGE_ADAPTOR_TRANSFORMD_HPP
#define SPROUT_RANGE_ADAPTOR_TRANSFORMD_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/container/traits.hpp>
#include <sprout/container/functions.hpp>
#include <sprout/iterator/transform_iterator.hpp>
#include <sprout/range/adaptor/detail/adapted_range_default.hpp>
#include <sprout/type_traits/lvalue_reference.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/utility/lvalue_forward.hpp>
#include <sprout/utility/value_holder/value_holder.hpp>
namespace sprout {
namespace adaptors {
//
// transformed_range
//
template<typename BinaryFunction, typename LRange, typename RRange = void>
class transformed_range
: public sprout::adaptors::detail::adapted_range_default<
LRange,
sprout::transform_iterator<
BinaryFunction,
typename sprout::container_traits<LRange>::iterator,
typename sprout::container_traits<RRange>::iterator
>
>
{
public:
typedef BinaryFunction functor_type;
typedef LRange range1_type;
typedef RRange range2_type;
typedef sprout::adaptors::detail::adapted_range_default<
LRange,
sprout::transform_iterator<
BinaryFunction,
typename sprout::container_traits<LRange>::iterator,
typename sprout::container_traits<RRange>::iterator
>
> base_type;
typedef typename base_type::iterator iterator;
public:
transformed_range() = default;
transformed_range(transformed_range const&) = default;
SPROUT_CONSTEXPR transformed_range(BinaryFunction func, range1_type& range1, range2_type& range2)
: base_type(
iterator(sprout::begin(range1), sprout::begin(range2), func),
iterator(sprout::end(range1), sprout::end(range2), func)
)
{}
};
template<typename UnaryFunction, typename Range>
class transformed_range<UnaryFunction, Range, void>
: public sprout::adaptors::detail::adapted_range_default<
Range,
sprout::transform_iterator<
UnaryFunction,
typename sprout::container_traits<Range>::iterator
>
>
{
public:
typedef UnaryFunction functor_type;
typedef Range range1_type;
typedef sprout::adaptors::detail::adapted_range_default<
Range,
sprout::transform_iterator<
UnaryFunction,
typename sprout::container_traits<Range>::iterator
>
> base_type;
typedef typename base_type::iterator iterator;
public:
transformed_range() = default;
transformed_range(transformed_range const&) = default;
SPROUT_CONSTEXPR transformed_range(UnaryFunction func, range1_type& range)
: base_type(
iterator(sprout::begin(range), func),
iterator(sprout::end(range), func)
)
{}
};
//
// transform_holder
//
template<typename BinaryFunction, typename RRange = void>
class transform_holder {
public:
typedef BinaryFunction functor_type;
typedef RRange range2_type;
private:
BinaryFunction func_;
sprout::value_holder<range2_type&> range_;
public:
transform_holder() = default;
transform_holder(transform_holder const&) = default;
SPROUT_CONSTEXPR transform_holder(BinaryFunction func, range2_type& range)
: func_(func)
, range_(range)
{}
SPROUT_CONSTEXPR BinaryFunction functor() const {
return func_;
}
SPROUT_CONSTEXPR range2_type& range() const {
return range_;
}
};
template<typename UnaryFunction>
class transform_holder<UnaryFunction, void> {
public:
typedef UnaryFunction functor_type;
private:
UnaryFunction func_;
public:
transform_holder() = default;
transform_holder(transform_holder const&) = default;
explicit SPROUT_CONSTEXPR transform_holder(UnaryFunction func)
: func_(func)
{}
SPROUT_CONSTEXPR UnaryFunction functor() const {
return func_;
}
};
//
// transformed_forwarder
//
class transformed_forwarder {
public:
template<typename RRange, typename BinaryFunction>
SPROUT_CONSTEXPR sprout::adaptors::transform_holder<
BinaryFunction,
typename std::remove_reference<typename sprout::lvalue_reference<RRange>::type>::type
>
operator()(RRange&& range, BinaryFunction func) const {
return sprout::adaptors::transform_holder<
BinaryFunction,
typename std::remove_reference<typename sprout::lvalue_reference<RRange>::type>::type
>(
func,
sprout::lvalue_forward<RRange>(range)
);
}
template<typename UnaryFunction>
SPROUT_CONSTEXPR sprout::adaptors::transform_holder<UnaryFunction>
operator()(UnaryFunction func) const {
return sprout::adaptors::transform_holder<UnaryFunction>(func);
}
};
//
// transformed
//
namespace {
SPROUT_STATIC_CONSTEXPR sprout::adaptors::transformed_forwarder transformed = {};
} // anonymous-namespace
//
// operator|
//
template<typename LRange, typename BinaryFunction, typename RRange>
inline SPROUT_CONSTEXPR sprout::adaptors::transformed_range<
BinaryFunction,
typename std::remove_reference<typename sprout::lvalue_reference<LRange>::type>::type,
RRange
>
operator|(LRange&& lhs, sprout::adaptors::transform_holder<BinaryFunction, RRange> const& rhs) {
return sprout::adaptors::transformed_range<
BinaryFunction,
typename std::remove_reference<typename sprout::lvalue_reference<LRange>::type>::type,
RRange
>(
rhs.functor(),
sprout::lvalue_forward<LRange>(lhs),
rhs.range()
);
}
template<typename Range, typename UnaryFunction>
inline SPROUT_CONSTEXPR sprout::adaptors::transformed_range<
UnaryFunction,
typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
>
operator|(Range&& lhs, sprout::adaptors::transform_holder<UnaryFunction> const& rhs) {
return sprout::adaptors::transformed_range<
UnaryFunction,
typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type
>(
rhs.functor(),
sprout::lvalue_forward<Range>(lhs)
);
}
} // namespace adaptors
//
// container_construct_traits
//
template<typename UnaryOrBinaryFunction, typename LRange, typename RRange>
struct container_construct_traits<sprout::adaptors::transformed_range<UnaryOrBinaryFunction, LRange, RRange> >
: public sprout::container_construct_traits<typename sprout::adaptors::transformed_range<UnaryOrBinaryFunction, LRange, RRange>::base_type>
{};
} // namespace sprout
#endif // #ifndef SPROUT_RANGE_ADAPTOR_TRANSFORMD_HPP