Question

I want to copy a sequence of items in a Platform::Array object to another Platform::Array. I can of course solve this for example with a for loop:

int srcIdx = srcIdx0;
int destIdx = destIdx0;
for (int i = 0; i < count; ++i, ++srcIdx, ++destIdx)
    dest[destIdx] = src[srcIdx];

What I am wondering is, is there some built-in functionality in C++/CX (Component Extensions) for performing this operation more efficiently and less verbose?

In C#, there is the Array.Copy method, and with C++/CLI Marshal.Copy would be an option at least for copying “primitive” types.

In C++ STL, there is std::copy and std::copy_n, but from what I can tell these algorithms do not work with Platform::Array “iterators” begin() and end().

Is there a C++/CX convenience copy method “hidden” somewhere, or do I have to fallback on explicit for loops for this operation?

Answer 1

At this point in time there seem to be no built-in Platform::Array copy methods, so I have implemented my own template function for the purpose:

template<typename T> void Copy(
    const Platform::Array<T>^ sourceArray, 
    int sourceIndex, 
    Platform::Array<T>^ destinationArray, 
    int destinationIndex, 
    int length)
{
    for (int i = 0; i < length; ++i, ++sourceIndex, ++destinationIndex)
        destinationArray[destinationIndex] = sourceArray[sourceIndex];
};

Suggestions on how to improve the copying part are more than welcome 🙂