Copy
31/// Set the `tierValues` on construction to be referenced immutably.
32function initializeValueTier(uint256[8] memory tierValues_) internal {
33    // Reinitialization is a bug.
34    assert(tierValuesPointer == address(0));
35    address tierValuesPointer_ = SSTORE2.write(abi.encode(tierValues_));
36    emit InitializeValueTier(msg.sender, tierValuesPointer_);
37    tierValuesPointer = tierValuesPointer_;
38}
39
40/// Complements the default solidity accessor for `tierValues`.
41/// Returns all the values in a list rather than requiring an index be
42/// specified.
43/// @return tierValues_ The immutable `tierValues`.
44function tierValues() public view returns (uint256[8] memory tierValues_) {
45    return abi.decode(SSTORE2.read(tierValuesPointer), (uint256[8]));
46}
47
48/// Converts a Tier to the minimum value it requires.
49/// tier 0 is always value 0 as it is the fallback.
50/// @param tier_ The Tier to convert to a value.
51function tierToValue(uint256[8] memory tierValues_, uint256 tier_)
52    internal
53    pure
54    returns (uint256)
55{
56    return tier_ > TierConstants.TIER_ZERO ? tierValues_[tier_ - 1] : 0;
57}
58
59/// Converts a value to the maximum Tier it qualifies for.
60/// @param value_ The value to convert to a tier.
61function valueToTier(uint256[8] memory tierValues_, uint256 value_)
62    internal
63    pure
64    returns (uint256)
65{
66    for (uint256 i_ = 0; i_ < TierConstants.MAX_TIER; i_++) {
67        if (value_ < tierValues_[i_]) {
68            return i_;
69        }
70    }
71    return TierConstants.MAX_TIER;
72}