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lammps/lib/kokkos/core/src/Kokkos_Array.hpp
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Kokkos_Array.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#ifndef KOKKOS_ARRAY
#define KOKKOS_ARRAY
#include <type_traits>
#include <algorithm>
#include <limits>
namespace Kokkos {
/**\brief Derived from the C++17 'std::array'.
* Dropping the iterator interface.
*/
template< class T = void
, size_t N = ~size_t(0)
, class Proxy = void
>
struct Array {
private:
T m_elem[N];
public:
typedef T & reference ;
typedef typename std::add_const<T>::type & const_reference ;
typedef size_t size_type ;
typedef ptrdiff_t difference_type ;
typedef T value_type ;
typedef T * pointer ;
typedef typename std::add_const<T>::type * const_pointer ;
KOKKOS_INLINE_FUNCTION static constexpr size_type size() { return N ; }
KOKKOS_INLINE_FUNCTION static constexpr bool empty(){ return false ; }
template< typename iType >
KOKKOS_INLINE_FUNCTION
reference operator[]( const iType & i )
{
static_assert( std::is_integral<iType>::value , "Must be integral argument" );
return m_elem[i];
}
template< typename iType >
KOKKOS_INLINE_FUNCTION
const_reference operator[]( const iType & i ) const
{
static_assert( std::is_integral<iType>::value , "Must be integral argument" );
return m_elem[i];
}
KOKKOS_INLINE_FUNCTION pointer data() { return & m_elem[0] ; }
KOKKOS_INLINE_FUNCTION const_pointer data() const { return & m_elem[0] ; }
~Array() = default ;
Array() = default ;
Array( const Array & ) = default ;
Array & operator = ( const Array & ) = default ;
// Some supported compilers are not sufficiently C++11 compliant
// for default move constructor and move assignment operator.
// Array( Array && ) = default ;
// Array & operator = ( Array && ) = default ;
};
template< class T , class Proxy >
struct Array<T,0,Proxy> {
public:
typedef typename std::add_const<T>::type & reference ;
typedef typename std::add_const<T>::type & const_reference ;
typedef size_t size_type ;
typedef ptrdiff_t difference_type ;
typedef typename std::add_const<T>::type value_type ;
typedef typename std::add_const<T>::type * pointer ;
typedef typename std::add_const<T>::type * const_pointer ;
KOKKOS_INLINE_FUNCTION static constexpr size_type size() { return 0 ; }
KOKKOS_INLINE_FUNCTION static constexpr bool empty() { return true ; }
template< typename iType >
KOKKOS_INLINE_FUNCTION
value_type operator[]( const iType & )
{
static_assert( std::is_integral<iType>::value , "Must be integer argument" );
return value_type();
}
template< typename iType >
KOKKOS_INLINE_FUNCTION
value_type operator[]( const iType & ) const
{
static_assert( std::is_integral<iType>::value , "Must be integer argument" );
return value_type();
}
KOKKOS_INLINE_FUNCTION pointer data() { return pointer(0) ; }
KOKKOS_INLINE_FUNCTION const_pointer data() const { return const_pointer(0); }
~Array() = default ;
Array() = default ;
Array( const Array & ) = default ;
Array & operator = ( const Array & ) = default ;
// Some supported compilers are not sufficiently C++11 compliant
// for default move constructor and move assignment operator.
// Array( Array && ) = default ;
// Array & operator = ( Array && ) = default ;
};
template<>
struct Array<void,~size_t(0),void>
{
struct contiguous {};
struct strided {};
};
template< class T >
struct Array< T , ~size_t(0) , Array<>::contiguous >
{
private:
T * m_elem ;
size_t m_size ;
public:
typedef T & reference ;
typedef typename std::add_const<T>::type & const_reference ;
typedef size_t size_type ;
typedef ptrdiff_t difference_type ;
typedef T value_type ;
typedef T * pointer ;
typedef typename std::add_const<T>::type * const_pointer ;
KOKKOS_INLINE_FUNCTION constexpr size_type size() const { return m_size ; }
KOKKOS_INLINE_FUNCTION constexpr bool empty() const { return 0 != m_size ; }
template< typename iType >
KOKKOS_INLINE_FUNCTION
reference operator[]( const iType & i )
{
static_assert( std::is_integral<iType>::value , "Must be integral argument" );
return m_elem[i];
}
template< typename iType >
KOKKOS_INLINE_FUNCTION
const_reference operator[]( const iType & i ) const
{
static_assert( std::is_integral<iType>::value , "Must be integral argument" );
return m_elem[i];
}
KOKKOS_INLINE_FUNCTION pointer data() { return m_elem ; }
KOKKOS_INLINE_FUNCTION const_pointer data() const { return m_elem ; }
~Array() = default ;
Array() = delete ;
Array( const Array & rhs ) = delete ;
// Some supported compilers are not sufficiently C++11 compliant
// for default move constructor and move assignment operator.
// Array( Array && rhs ) = default ;
// Array & operator = ( Array && rhs ) = delete ;
KOKKOS_INLINE_FUNCTION
Array & operator = ( const Array & rhs )
{
const size_t n = std::min( m_size , rhs.size() );
for ( size_t i = 0 ; i < n ; ++i ) m_elem[i] = rhs[i] ;
return *this ;
}
template< size_t N , class P >
KOKKOS_INLINE_FUNCTION
Array & operator = ( const Array<T,N,P> & rhs )
{
const size_t n = std::min( m_size , rhs.size() );
for ( size_t i = 0 ; i < n ; ++i ) m_elem[i] = rhs[i] ;
return *this ;
}
KOKKOS_INLINE_FUNCTION constexpr Array( pointer arg_ptr , size_type arg_size , size_type = 0 )
: m_elem(arg_ptr), m_size(arg_size) {}
};
template< class T >
struct Array< T , ~size_t(0) , Array<>::strided >
{
private:
T * m_elem ;
size_t m_size ;
size_t m_stride ;
public:
typedef T & reference ;
typedef typename std::add_const<T>::type & const_reference ;
typedef size_t size_type ;
typedef ptrdiff_t difference_type ;
typedef T value_type ;
typedef T * pointer ;
typedef typename std::add_const<T>::type * const_pointer ;
KOKKOS_INLINE_FUNCTION constexpr size_type size() const { return m_size ; }
KOKKOS_INLINE_FUNCTION constexpr bool empty() const { return 0 != m_size ; }
template< typename iType >
KOKKOS_INLINE_FUNCTION
reference operator[]( const iType & i )
{
static_assert( std::is_integral<iType>::value , "Must be integral argument" );
return m_elem[i*m_stride];
}
template< typename iType >
KOKKOS_INLINE_FUNCTION
const_reference operator[]( const iType & i ) const
{
static_assert( std::is_integral<iType>::value , "Must be integral argument" );
return m_elem[i*m_stride];
}
KOKKOS_INLINE_FUNCTION pointer data() { return m_elem ; }
KOKKOS_INLINE_FUNCTION const_pointer data() const { return m_elem ; }
~Array() = default ;
Array() = delete ;
Array( const Array & ) = delete ;
// Some supported compilers are not sufficiently C++11 compliant
// for default move constructor and move assignment operator.
// Array( Array && rhs ) = default ;
// Array & operator = ( Array && rhs ) = delete ;
KOKKOS_INLINE_FUNCTION
Array & operator = ( const Array & rhs )
{
const size_t n = std::min( m_size , rhs.size() );
for ( size_t i = 0 ; i < n ; ++i ) m_elem[i] = rhs[i] ;
return *this ;
}
template< size_t N , class P >
KOKKOS_INLINE_FUNCTION
Array & operator = ( const Array<T,N,P> & rhs )
{
const size_t n = std::min( m_size , rhs.size() );
for ( size_t i = 0 ; i < n ; ++i ) m_elem[i] = rhs[i] ;
return *this ;
}
KOKKOS_INLINE_FUNCTION constexpr Array( pointer arg_ptr , size_type arg_size , size_type arg_stride )
: m_elem(arg_ptr), m_size(arg_size), m_stride(arg_stride) {}
};
} // namespace Kokkos
#endif /* #ifndef KOKKOS_ARRAY */
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