Class CBlockIndexWorkComparator

src/node/blockstorage.h:140–143

using BlockMap = std::unordered_map<uint256, CBlockIndex, BlockHasher>;

struct CBlockIndexWorkComparator {
    bool operator()(const CBlockIndex* pa, const CBlockIndex* pb) const;
    using is_transparent = void;
};

struct CBlockIndexHeightOnlyComparator {
    /* Only compares the height of two block indices, doesn't try to tie-break */