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bolero-MURAKAMI 2011-09-01 02:48:32 +00:00
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sprout/operation/fixed/resize_backward.hpp Normal file
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#ifndef SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_HPP
#define SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_HPP
#include <cstddef>
#include <sprout/config.hpp>
#include <sprout/index_tuple.hpp>
#include <sprout/fixed_container/traits.hpp>
#include <sprout/fixed_container/functions.hpp>
namespace sprout {
namespace fixed {
namespace result_of {
//
// resize_backward
//
template<std::size_t N, typename Container>
struct resize_backward
: public resize<N, Container>
{};
} // namespace result_of
namespace detail {
template<typename Result, typename Container, typename T, std::ptrdiff_t... Indexes>
SPROUT_CONSTEXPR inline Result resize_backward_impl(
Container const& cont,
sprout::index_tuple<Indexes...>,
typename sprout::fixed_container_traits<Result>::difference_type size,
typename sprout::fixed_container_traits<Result>::difference_type offset,
T const& v
)
{
return Result{
(Indexes >= offset && Indexes < offset + size
? *(sprout::begin(cont) + Indexes - offset)
: v
)...
};
}
} // namespace detail
//
// resize_backward
//
template<std::size_t N, typename Container, typename T>
SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::resize_backward<N, Container>::type resize_backward(
Container const& cont,
T const& v
)
{
return sprout::fixed::detail::resize_backward_impl<typename sprout::fixed::result_of::resize_backward<N, Container>::type>(
cont,
typename sprout::index_range<0, sprout::fixed_container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::fixed_size>::type(),
sprout::size(cont),
static_cast<typename sprout::fixed_container_traits<Container>::difference_type>(
sprout::fixed_container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::fixed_size
)
- sprout::size(cont),
v
);
}
namespace detail {
template<typename Result, typename Container, std::ptrdiff_t... Indexes>
SPROUT_CONSTEXPR inline Result resize_backward_impl(
Container const& cont,
sprout::index_tuple<Indexes...>,
typename sprout::fixed_container_traits<Result>::difference_type size,
typename sprout::fixed_container_traits<Result>::difference_type offset
)
{
return Result{
(Indexes >= offset && Indexes < offset + size
? *(sprout::begin(cont) + Indexes - offset)
: typename sprout::fixed_container_traits<Result>::value_type{}
)...
};
}
} // namespace detail
//
// resize_backward
//
template<std::size_t N, typename Container>
SPROUT_CONSTEXPR inline typename sprout::fixed::result_of::resize_backward<N, Container>::type resize_backward(
Container const& cont
)
{
return sprout::fixed::detail::resize_backward_impl<typename sprout::fixed::result_of::resize_backward<N, Container>::type>(
cont,
typename sprout::index_range<0, sprout::fixed_container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::fixed_size>::type(),
sprout::size(cont),
static_cast<typename sprout::fixed_container_traits<Container>::difference_type>(
sprout::fixed_container_traits<typename sprout::fixed::result_of::resize_backward<N, Container>::type>::fixed_size
)
- sprout::size(cont)
);
}
} // namespace fixed
} // namespace sprout
#endif // #ifndef SPROUT_OPERATION_FIXED_RESIZE_BACKWARD_HPP