Function ImGuiPlatformIO_ProbeAggregateCallbacks 

pub unsafe fn ImGuiPlatformIO_ProbeAggregateCallbacks(
    platform_io: *mut ImGuiPlatformIO,
    out_result: *mut DearImguiRsPlatformIoAggregateProbeResult,
) -> bool

Invoke all aggregate PlatformIO callback slots through C++.

This is a test-support ABI for validating that callbacks installed by the safe layer cross the C++/Rust seam through pointers or out parameters rather than small aggregates by value.

Safety

platform_io and out_result must point to valid live values. The current ImGui context must own platform_io.