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#ifndef __BTAS_TENSOR_ITERATOR_WRAPPER_H
#define __BTAS_TENSOR_ITERATOR_WRAPPER_H 1
#include <type_traits>
#include <btas/tensor_traits.h>
namespace btas {
template<bool _HasData>
struct tensor_iterator_wrapper
{
template<class _Tensor>
static auto begin(_Tensor& x) -> decltype(x.begin()) { return x.begin(); }
template<class _Tensor>
static auto end (_Tensor& x) -> decltype(x.end ()) { return x.end (); }
};
template<>
struct tensor_iterator_wrapper<true>
{
template<class _Tensor>
static auto begin(_Tensor& x) -> decltype(x.data()) { return x.data(); }
template<class _Tensor>
static auto end (_Tensor& x) -> decltype(x.data()) { return x.data()+x.size(); }
};
/// \return wrapped iterator of Tensor to the first
template<class _Tensor, class = typename std::enable_if<is_tensor<_Tensor>::value>::type>
auto tbegin (_Tensor& x) -> decltype(tensor_iterator_wrapper<has_data<_Tensor>::value>::begin(x))
{
return tensor_iterator_wrapper<has_data<_Tensor>::value>::begin(x);
}
/// \return wrapped iterator of Tensor to the last
template<class _Tensor, class = typename std::enable_if<is_tensor<_Tensor>::value>::type>
auto tend (_Tensor& x) -> decltype(tensor_iterator_wrapper<has_data<_Tensor>::value>::end(x))
{
return tensor_iterator_wrapper<has_data<_Tensor>::value>::end(x);
}
} // namespace btas
#endif // __BTAS_TENSOR_ITERATOR_WRAPPER_H
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