Overview

The goal is to develop a C++ library that allows to abstract the data layout of an array. Possible data layouts include aray of struct (AoS) and struct of array (SoA), see the following example.

constexpr std::size_t N = 42;

struct Point { int x, y, z; };
Point point_aos[N];  // data layout: AoS

template <std::size_t N>
struct PointSoA {
    int x[N];
    int y[N];
    int z[N];
};

Point<N> point_soa;  // data layout: SoA

We aim at writing a class that takes the struct Point, a data layout, and possibly more arguments. The class then allows for AoS access, but stores the data in a possibly different layout, thereby hiding the data layout.

template<
    template <class> class F,                  // container
    template <template <class> class> class S, // e.g. "Point"
    layout L                                   // data layout
>
struct wrapper;

New: Unit Tests

• Added tests using only plain pointers as "container" (F is a pointer type in the class "wrapper" above.)
• Unit test for CUDA code.

New: RAII classes as containers for device or unified memory

Reason:

• For unit testing I want to hide the CUDA code behind C++ code since the unit testing is C++ only.

Investigated approaches:

• Custom "uniqu_ptr" clone
  
• Custom "shared_ptr" clone
• Classes that manage a pointer (AoS) of multiple pointers (SoA) managing the memory

New: Linker Error with GTest

• Cannot link libraries using CUDA code when linking gtest at the same time.
• Happens even if all CUDA is hidden behind a wrapping C++ function.
• Linking only fails if I also link gtest and if I use CUDA under the hood.