Method createChildView

Tests/Libraries/AsyncStreams/AsyncStreamsTest.cpp:408–482

}

void SC::AsyncStreamsTest::createChildView()
{
    constexpr size_t numberOfBuffers = 4;
    AsyncBufferView  buffers[numberOfBuffers];
    Buffer           buffer;
    SC_TEST_EXPECT(buffer.resizeWithoutInitializing(100));
    // Create parent buffer
    buffers[0] = Span<char>(buffer.toSpan().data(), 100);
    buffers[0].setReusable(true);
    AsyncBuffersPool pool;
    pool.setBuffers(buffers);

    // Get a buffer and fill it with data
    AsyncBufferView::ID parentID;
    Span<char>          parentData;
    SC_TEST_EXPECT(pool.requestNewBuffer(100, parentID, parentData));
    const char* testData = "Hello World! This is a test buffer for child views.";
    memcpy(parentData.data(), testData, strlen(testData));

    // Create child view
    AsyncBufferView::ID childID;
    SC_TEST_EXPECT(pool.createChildView(parentID, 6, 11, childID)); // "World"

    // Check child data
    Span<const char> childData;
    SC_TEST_EXPECT(pool.getReadableData(childID, childData));
    SC_TEST_EXPECT(childData.sizeInBytes() == 11);
    SC_TEST_EXPECT(memcmp(childData.data(), "World! This ", 11) == 0);

    // Verify writable data on child (since parent is writable)
    Span<char> childWritableData;
    SC_TEST_EXPECT(pool.getWritableData(childID, childWritableData));
    SC_TEST_EXPECT(childWritableData.sizeInBytes() == 11);
    childWritableData[0] = 'W'; // "World"

    // Create grandchild view (child of child)
    AsyncBufferView::ID grandchildID;
    SC_TEST_EXPECT(
        pool.createChildView(childID, 7, 4, grandchildID)); // "This" (relative to child: 7+6=13 relative to parent)

    Span<const char> grandchildData;
    SC_TEST_EXPECT(pool.getReadableData(grandchildID, grandchildData));
    SC_TEST_EXPECT(grandchildData.sizeInBytes() == 4);
    SC_TEST_EXPECT(memcmp(grandchildData.data(), "This", 4) == 0);

    // Test error cases
    AsyncBufferView::ID invalidID;
    SC_TEST_EXPECT(not pool.createChildView(AsyncBufferView::ID(999), 0, 10, invalidID)); // Invalid parent
    SC_TEST_EXPECT(not pool.createChildView(parentID, 90, 20, invalidID));                // Out of bounds

    // Verify resizing child view
    pool.setNewBufferSize(childID, 5); // Resize to 5 ("World")
    SC_TEST_EXPECT(pool.getReadableData(childID, childData));
    SC_TEST_EXPECT(childData.sizeInBytes() == 5);
    SC_TEST_EXPECT(memcmp(childData.data(), "World", 5) == 0);

    pool.setNewBufferSize(childID, 10); // Try to expand back (should be ignored)
    SC_TEST_EXPECT(pool.getReadableData(childID, childData));