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#ifndef __BTAS_ARRAYADAPTOR_H_
#define __BTAS_ARRAYADAPTOR_H_
// adaptors for std "array" containers
#include <vector>
#include <array>
#include <cassert>
#include <btas/tensor_traits.h>
#include <btas/generic/numeric_type.h>
#include <btas/varray/varray.h>
#include <btas/serialization.h>
#include <boost/version.hpp>
#include <boost/serialization/array.hpp>
namespace btas {
template <typename Array> struct array_adaptor;
/// Adaptor from std::array
template <typename T, size_t N>
struct array_adaptor< std::array<T, N> > {
typedef std::array<T, N> array;
typedef typename array::value_type value_type;
static array construct(std::size_t n) {
assert(n <= N);
array result;
return result;
}
static array construct(std::size_t n, T value) {
assert(n <= N);
array result;
std::fill_n(result.begin(), n, value);
return result;
}
static void resize(array& x, std::size_t n) {
assert(x.size() == N);
assert(x.size() >= n);
}
static void print(const array& a, std::ostream& os) {
os << "{";
for(std::size_t i = 0; i != N; ++i) {
os << a[i];
if (i != (N - 1))
os << ",";
}
os << "}";
}
};
template <typename T, size_t N>
constexpr std::size_t rank(const std::array<T, N>& x) noexcept {
return N;
}
/// Adaptor from const-size array
template <typename T, size_t N>
struct array_adaptor< T[N] > {
typedef T (array)[N];
typedef T value_type;
static void print(const array& a, std::ostream& os) {
os << "{";
for(std::size_t i = 0; i != N; ++i) {
os << a[i];
if (i != (N - 1))
os << ",";
}
os << "}";
}
};
template <typename T, size_t N>
constexpr std::size_t rank(const T (&x)[N]) noexcept {
return N;
}
template <typename T, size_t N>
std::ostream& operator<<(std::ostream& os, const std::array<T, N>& x) {
array_adaptor<std::array<T, N> >::print(x,os);
return os;
}
/// Adaptors for sequence container, e.g. std::vector, btas::varray, and std::initializer_list
template <typename Array, class = typename std::enable_if<not btas::is_tensor<Array>::value>::type>
std::size_t rank(const Array& x) {
return x.size();
}
template <typename Array>
struct array_adaptor {
typedef Array array;
typedef typename Array::value_type value_type;
static array construct(std::size_t N) {
return array(N);
}
static array construct(std::size_t N,
value_type value) {
return array(N, value);
}
static void resize(array& x, std::size_t N) {
x.resize(N);
}
static void print(const array& a, std::ostream& os) {
std::size_t n = rank(a);
os << "{";
for(std::size_t i = 0; i != n; ++i) {
os << a[i];
if (i != (n - 1))
os << ",";
}
os << "}";
}
};
template <typename T>
std::ostream& operator<<(std::ostream& os, const btas::varray<T>& x) {
array_adaptor<btas::varray<T> >::print(x,os);
return os;
}
template <typename T>
std::ostream& operator<<(std::ostream& os, const std::vector<T>& x) {
array_adaptor<std::vector<T> >::print(x,os);
return os;
}
template <typename T>
std::ostream& operator<<(std::ostream& os, const std::initializer_list<T>& x) {
array_adaptor<std::vector<T> >::print(x,os);
return os;
}
}
namespace std {
template <typename T, size_t N>
const T* cbegin(const T(&x)[N]) {
return &x[0];
}
template <typename T, size_t N>
const T* cend(const T(&x)[N]) {
return &x[N];
}
template <typename T, size_t N>
const T* rbegin(T(&x)[N]) {
return &x[N-1];
}
template <typename T, size_t N>
const T* rend(T(&x)[N]) {
return &x[0] - 1;
}
template <typename T>
const T* cbegin(const T* x) {
return x;
}
template <typename T>
const T* cbegin(T* x) {
return x;
}
template <typename T>
T* begin(T* x) {
return x;
}
#if __cplusplus == 201103L // add useful bits to make transition to C++14 easier
template <typename C>
constexpr auto cbegin(const C& x) -> decltype(std::begin(x)) {
return std::begin(x);
}
template <typename C>
constexpr auto cend(const C& x) -> decltype(std::end(x)) {
return std::end(x);
}
template <typename C>
auto rbegin(C& x) -> decltype(x.rbegin()) {
return x.rbegin();
}
template <typename C>
auto rend(C& x) -> decltype(x.rend()) {
return x.rend();
}
#endif
template <typename T>
struct make_unsigned<std::vector<T> > {
typedef std::vector<typename make_unsigned<T>::type > type;
};
template <typename T>
struct make_unsigned<std::initializer_list<T> > {
typedef std::initializer_list<typename make_unsigned<T>::type > type;
};
template <typename T, size_t N>
struct make_unsigned<std::array<T, N> > {
typedef std::array<typename make_unsigned<T>::type, N> type;
};
template <typename T>
struct make_unsigned<btas::varray<T> > {
typedef btas::varray<typename make_unsigned<T>::type > type;
};
template <typename T, size_t N>
struct make_unsigned<T[N]> {
typedef typename make_unsigned<T>::type uT;
typedef uT (type)[N];
};
}
namespace btas {
template <typename Array, typename T>
struct replace_value_type;
template <typename T, typename U>
struct replace_value_type<std::vector<T>, U> {
typedef std::vector<U> type;
};
template <typename T, typename U>
struct replace_value_type<std::initializer_list<T>,U> {
typedef std::initializer_list<U> type;
};
template <typename T, size_t N, typename U>
struct replace_value_type<std::array<T, N>,U> {
typedef std::array<U, N> type;
};
template <typename T, typename U>
struct replace_value_type<btas::varray<T>,U> {
typedef btas::varray<U> type;
};
template <typename T, size_t N, typename U>
struct replace_value_type<T[N],U> {
typedef U (type)[N];
};
}
#ifndef BOOST_SERIALIZATION_STD_ARRAY // legacy switch to disable BTAS-provided serialization of std:array
#define BOOST_SERIALIZATION_STD_ARRAY
# if BOOST_VERSION / 100 < 1056
namespace boost {
namespace serialization {
template<class Archive, class T, size_t N>
void serialize(Archive & ar, std::array<T,N> & a, const unsigned int version)
{
ar & boost::serialization::make_array(a.data(), a.size());
}
} // namespace serialization
} // namespace boost
# endif // boost < 1.56 does not serialize std::array ... provide our own
#endif // not defined BOOST_SERIALIZATION_STD_ARRAY? provide our own
#endif /* __BTAS_ARRAYADAPTOR_H_ */
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