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  • Previous Versions
    • Version 5
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            BooleanEntry
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            Burn
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            DeleteEntry
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            IntegerEntry
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            Issue
          • Lease
            Lease
          • LeaseCancel
            LeaseCancel
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            Reissue
          • ScriptTransfer
            ScriptTransfer
          • SponsorFee
            SponsorFee
          • StringEntry
            StringEntry
          Script Actions
        • Common Structures
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            UpdateAssetInfoTransaction
          Transaction Structures
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        • dApp-to-dApp Invocation Function
          dApp-to-dApp Invocation Function
        • Data Transaction Functions
          Data Transaction Functions
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          Encoding Functions
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      Version 5
    • Version 4 and 3
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          • BinaryEntry (v4)
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            DeleteEntry (v4)
          • IntegerEntry (v4)
            IntegerEntry (v4)
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            Issue (v4)
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            Reissue (v4)
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            StringEntry (v4)
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        • Common Structures
          • Address
            Address
          • Alias
            Alias
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            Asset
          • AssetPair
            AssetPair
          • AttachedPayment
            AttachedPayment
          • BalanceDetails
            BalanceDetails
          • BlockInfo
            BlockInfo
          • Invocation
            Invocation
          • Order
            Order
          • Transfer
            Transfer
          Common Structures
        • Transaction Structures
          • BurnTransaction
            BurnTransaction
          • CreateAliasTransaction
            CreateAliasTransaction
          • DataTransaction
            DataTransaction
          • ExchangeTransaction
            ExchangeTransaction
          • GenesisTransaction
            GenesisTransaction
          • InvokeScriptTransaction
            InvokeScriptTransaction
          • IssueTransaction
            IssueTransaction
          • LeaseCancelTransaction
            LeaseCancelTransaction
          • LeaseTransaction
            LeaseTransaction
          • MassTransferTransaction
            MassTransferTransaction
          • ReissueTransaction
            ReissueTransaction
          • SetAssetScriptTransaction
            SetAssetScriptTransaction
          • SetScriptTransaction
            SetScriptTransaction
          • SponsorFeeTransaction
            SponsorFeeTransaction
          • TransferTransaction
            TransferTransaction
          • UpdateAssetInfoTransaction
            UpdateAssetInfoTransaction
          Transaction Structures
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      • Built-in Variables
        Built-in Variables
      • Built-in Functions
        • Account Data Storage Functions
          Account Data Storage Functions
        • Blockchain Functions
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        • Byte Array Functions
          Byte Array Functions
        • Converting Functions
          Converting Functions
        • Data Transaction Functions
          Data Transaction Functions
        • Decoding Functions
          Decoding Functions
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        Limitations
      Version 4 and 3
    Previous Versions
  • Import Libraries
    Import Libraries
  • Ride Components
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      On this page
        • dApp-to-dApp Invocation
        • Lease and LeaseCancel Script Actions
        • Big Integers
        • Miscellaneous
      waves_logo Docs

          # [Ride v5] Standard Library Version 5

          ⚠️ We recommend to use Standard library version 6 for application development.

          Standard library version 5 is enabled by feature #16 “Ride V5, dApp-to-dApp invocations”.

          # dApp-to-dApp Invocation

          A dApp callable function can invoke a callable function of another dApp, or another callable function of the same dApp, or even itself. The invoked function returns a value that the invoking function can use. The subsequent operations of invoking function are executed, taking into account script actions of invoked function (as if the actions are applied to the blockchain state). All callable functions are executed within a single Invoke Script transaction. The total complexity is limited. More about dApp-to-dApp invocation

          Changes in Ride:

          • Added the functions for dApp-to-dApp invocation:
            • invoke
            • reentrantInvoke
          • Added strict variables that are evaluated before the next expression to ensure executing callable functions and applying their actions in the right order.
          • Modified the Invocation structure: in case of dApp-to-dApp invocation, the structure contains the address and public key of both the sender of the Invoke Script transaction and the dApp account that invokes the callable function.
          • Modified the callable function result by adding a return value.

          # Lease and LeaseCancel Script Actions

          Added script actions that the callable function can perform:

          • Lease — leases WAVES.
          • LeaseCancel — cancels a specified lease.

          Using these actions, you can change the amount of the lease, in particular, withdraw a part of the leased funds. If you cancel a lease for a larger amount and create a new lease for a smaller amount with the same recipient in the same script invocation, the recipient's generating balance decreases by the difference. Otherwise, if you send two separate transactions: a Lease Cancel transaction and a Lease transaction, they can be added to a different blocks and therefore generating balance decreases by the amount of the canceled lease immediately and increases by the amount of the new lease after 1000 blocks.

          Added the function calculateLeaseId that calculates ID of the lease formed by the Lease structure.

          # Big Integers

          Added the BigInt data type of 64 bytes (512 bits) and functions supporting it:

          • fraction(BigInt, BigInt, BigInt): BigInt
          • fraction(BigInt, BigInt, BigInt, Union): BigInt
          • log(BigInt, Int, BigInt, Int, Int, Union): BigInt
          • max(List[BigInt]): BigInt
          • median(List[BigInt]): BigInt
          • min(List[BigInt]): BigInt
          • pow(BigInt, Int, BigInt, Int, Int, Union): BigInt
          • parseBigInt(String): BigInt|Unit
          • parseBigIntValue(String): BigInt
          • toBigInt(ByteVector): BigInt
          • toBigInt(ByteVector, Int, Int): BigInt
          • toBigInt(Int): BigInt
          • toBytes(BigInt): ByteVector
          • toInt(BigInt): Int
          • toString(BigInt): String

          # Miscellaneous

          When executing a dApp script, the payments attached to the invocation are considered to be already credited to the dApp balance (unlike versions 4 and 3, where payments do not affect the dApp balance until the end of script execution).

          Added the following built-in functions:

          • isDataStorageUntouched that checks if the data storage of a given account never contained any entries.
          • scriptHash that returns BLAKE2b-256 hash of the script assigned to a given account.
          • fraction(Int, Int, Int, Union): Int that multiplies and divides integers to avoid overflow, applying the specified rounding method.

          Added the following account data storage functions that allow the dApp script to read entries of its own data storage:

          • getBinary(key: String): ByteVector|Unit
          • getBinaryValue(key: String): ByteVector
          • getBoolean(key: String): Boolean|Unit
          • getBooleanValue(key: String): Boolean
          • getInteger(key: String): Int|Unit
          • getIntegerValue(key: String): Int
          • getString(key: String): String|Unit
          • getStringValue(key: String): String

          The maximum complexity of a callable function of a dApp script is changed to 10,000.

          Previous Versions
          Callable Function
          Previous Versions
          Callable Function