Function amem_graph_add_edge 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn amem_graph_add_edge(
    graph: *mut c_void,
    source_id: u64,
    target_id: u64,
    edge_type: u8,
    weight: f32,
) -> i32

Add an edge. Returns AMEM_OK or error code.

Safety

The caller must ensure that all pointer arguments are valid and non-null (unless the function explicitly handles null pointers), and that any pointed-to data is valid for the expected type and lifetime.