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feat: Set max n_coins on stable swap. added explanation of ann #181

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feat: Set max n_coins on stable swap. added explanation of ann #181

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Binary file modified precompile/binaries/stdlib/stableswap.mv
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7 changes: 5 additions & 2 deletions precompile/modules/initia_stdlib/sources/stableswap.move
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@ module initia_std::stableswap {

const A_PRECISION: u256 = 100;

const MAX_N_COINS: u64 = 5;

struct ModuleStore has key {
pools: Table<address, bool>,
pool_count: u64
Expand All @@ -24,7 +26,8 @@ module initia_std::stableswap {
struct Pool has key {
/// Extend Reference
extend_ref: ExtendRef,
/// ANN
/// ANN, calculated as A * n ** n * A_PRECISION, where A is the amplification factor.
/// All `ann` values remain consistent with this formula.
ann: Ann,
/// swap fee
swap_fee_rate: BigDecimal,
Expand Down Expand Up @@ -562,7 +565,7 @@ module initia_std::stableswap {
ann: u64
): FungibleAsset acquires Pool, ModuleStore {
assert!(
vector::length(&coins) >= 2,
vector::length(&coins) >= 2 && vector::length(&coins) <= MAX_N_COINS,
error::invalid_argument(EN_COINS)
);
let (_, timestamp) = block::get_block_info();
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