- 1 year ago
C++/WinRT : Sorting a IObservableVector<T>
To sort an IObservableVector<T>
in C++/WinRT, you can follow these steps:
Retrieve the underlying
IVector<T>
from theIObservableVector<T>
. TheIObservableVector<T>
interface inherits fromIVector<T>
, which provides sorting capabilities.Use the
IVector<T>::GetAt()
method to access individual elements of the vector.Implement a custom comparison function or lambda expression to define the sorting criteria for your
T
type. This function or lambda should return abool
value indicating whether one element is less than the other.Use the
std::sort
algorithm from the C++ Standard Library to sort the vector based on your custom comparison function.
Here's an example code snippet demonstrating the steps mentioned above:
cpp#include <vector>
#include <algorithm>
#include <winrt/Windows.Foundation.Collections.h>
using namespace winrt;
using namespace Windows::Foundation::Collections;
int main()
{
// Assuming you have an existing IObservableVector<T> named 'observableVector'
// Retrieve the underlying IVector<T>
IVector<int32_t> vector = observableVector.as<IVector<int32_t>>();
// Implement a custom comparison function (less than operator)
auto compareFunc = [](int32_t a, int32_t b) {
return a < b;
};
// Sort the vector using std::sort and the custom comparison function
std::sort(begin(vector), end(vector), compareFunc);
// The 'vector' will now be sorted
return 0;
}
Make sure to include the appropriate headers and namespaces (winrt
and Windows::Foundation::Collections
) and adjust the code according to your specific type and sorting criteria.
Note that IObservableVector<T>
provides notifications for changes to the vector, but the sorting process itself is performed on the underlying IVector<T>
. If you need to observe changes to the sorted vector, you can subscribe to the appropriate events provided by the IObservableVector<T>
interface.
Also, ensure that you have added the necessary dependencies and setup the C++/WinRT project correctly for working with Windows Runtime components.