Class MoveTrackItem

tests/misc/containers.cpp:614–650

Move-tracking item that allows copies but tracks them. Unlike TestItem (which deletes copies), this type lets us verify that containers USE move semantics even if they don't require move-only types.

// Unlike TestItem (which deletes copies), this type lets us verify that
// containers USE move semantics even if they don't require move-only types.
struct MoveTrackItem {
    int value;
    int move_count = 0;
    int copy_count = 0;

    MoveTrackItem() : value(0) {}
    explicit MoveTrackItem(int v) : value(v) {}

    MoveTrackItem(MoveTrackItem&& other) noexcept
        : value(other.value), move_count(other.move_count + 1),
          copy_count(other.copy_count) {
        other.move_count++;
    }

    MoveTrackItem& operator=(MoveTrackItem&& other) noexcept {
        value = other.value;
        move_count = other.move_count + 1;
        copy_count = other.copy_count;
        other.move_count++;
        return *this;
    }

    MoveTrackItem(const MoveTrackItem& other)
        : value(other.value), move_count(other.move_count),
          copy_count(other.copy_count + 1) {}

    MoveTrackItem& operator=(const MoveTrackItem& other) {
        value = other.value;
        move_count = other.move_count;
        copy_count = other.copy_count + 1;
        return *this;
    }

    bool operator==(const MoveTrackItem& other) const {
        return value == other.value;
    }
};

// Move semantics verification for map containers.
// Inserts values via move and verifies no copies occurred on the hot path.