Stokhos_DynamicArrayTraits.hpp

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// @HEADER
// *****************************************************************************
//                           Stokhos Package
//
// Copyright 2009 NTESS and the Stokhos contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef STOKHOS_DYNAMICARRAYTRAITS_HPP
#define STOKHOS_DYNAMICARRAYTRAITS_HPP

#include <new>
#include <cstring>

namespace Stokhos {


  template <typename T> struct IsScalarType {
    static const bool value = false;
  };

#define STOKHOS_BUILTIN_SPECIALIZATION(t)                  \
  template <> struct IsScalarType< t > {            \
    static const bool value = true;             \
  };

  STOKHOS_BUILTIN_SPECIALIZATION(float)
  STOKHOS_BUILTIN_SPECIALIZATION(double)
  STOKHOS_BUILTIN_SPECIALIZATION(int)
  STOKHOS_BUILTIN_SPECIALIZATION(long)

#undef STOKHOS_BUILTIN_SPECIALIZATION
  

  template <typename T, bool isScalar = IsScalarType<T>::value>
  struct ds_array {

    static inline T* get_and_fill(int sz) {
      T* m = static_cast<T* >(operator new(sz*sizeof(T)));
      T* p = m;
      for (int i=0; i<sz; ++i)
  new (p++) T(0.0);
      return m;
    }

    static inline T* get_and_fill(const T* src, int sz) {
      T* m = static_cast<T* >(operator new(sz*sizeof(T)));
      T* p = m; 
      for (int i=0; i<sz; ++i)
  new (p++) T(*(src++));
      return m;
    }

    static inline void copy(const T* src, T*  dest, int sz) {
      for (int i=0; i<sz; ++i)
  *(dest++) = *(src++);
    }

    static inline void zero(T* dest, int sz) {
      for (int i=0; i<sz; ++i)
  *(dest++) = T(0.);
    }

    static inline void destroy_and_release(T* m, int sz) {
      T* e = m+sz;
      for (T* b = m; b!=e; b++)
  b->~T();
      operator delete((void*) m);
    }
  };

  template <typename T>
  struct ds_array<T,true> {

    static inline T* get_and_fill(int sz) {
      T* m = static_cast<T* >(operator new(sz*sizeof(T)));
      std::memset(m,0,sz*sizeof(T));
      return m;
    }

    static inline T* get_and_fill(const T* src, int sz) {
      T* m = static_cast<T* >(operator new(sz*sizeof(T)));
      for (int i=0; i<sz; ++i)
  m[i] = src[i];
      return m;
    }

    static inline void copy(const T* src, T* dest, int sz) {
      std::memcpy(dest,src,sz*sizeof(T));
    }

    static inline void zero(T* dest, int sz) {
      std::memset(dest,0,sz*sizeof(T));
    }

    static inline void destroy_and_release(T* m, int sz) {
      operator delete((void*) m);
      }
  };

} // namespace Stokhos

#endif // STOKHOS_DYNAMICARRAYTRAITS_HPP