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crate::ix!();
pub struct BlockIndexWorkComparator { }
impl BlockIndexWorkComparator {
pub fn invoke(&self,
pa: *const BlockIndex,
pb: *const BlockIndex) -> bool {
unsafe {
// First sort by most total work, ...
if (*pa).n_chain_work > (*pb).n_chain_work {
return false;
}
if (*pa).n_chain_work < (*pb).n_chain_work {
return true;
}
// ... then by earliest time received, ...
if (*pa).n_sequence_id < (*pb).n_sequence_id {
return false;
}
if (*pa).n_sequence_id > (*pb).n_sequence_id {
return true;
}
// Use pointer address as tie breaker
// (should only happen with blocks loaded
// from disk, as those all have id 0).
if pa < pb {
return false;
}
if pa > pb {
return true;
}
}
// Identical blocks.
false
}
}