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guide/support_functions.md
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Support Functions are inbuilt functions which provide some functionality or expose internals for speed and technical reasons. **Support Functions are inbuilt functions which provide some functionality or expose internals for speed and technical reasons.**
LOAD(variable) LOAD(variable)
============== ==============
LOAD loads a variable which was previously stored in the blockchain using STORE function. Return type will be Uint64/String depending on what is stored. LOAD loads a variable which was previously stored in the blockchain using STORE function. Return type will be Uint64/String depending on what is stored.
It will panic if the value does NOT exists It will panic if the value does NOT exists.
Uint64 EXISTS(variable) Uint64 EXISTS(variable)
======================= =======================
EXISTS return 1 if the variable is store in DB and 0 otherwise EXISTS return 1 if the variable is store in DB and 0 otherwise.
STORE(key variable, value variable) STORE(key variable, value variable)
=================================== ===================================
STORE stores key and value in the DB. All storage state of the SC is accessible only from the SC which created it. STORE stores key and value in the DB. All storage state of the SC is accessible only from the SC which created it.
Uint64 RANDOM() Uint64 RANDOM() or Uint64 RANDOM(limit Uint64)
Uint64 RANDOM(limit Uin64) ==============================================
============================
RANDOM returns a random using a PRNG seeded on BLID,SCID,TXID. First form gives a uint64, second form returns RANDOM returns a random using a PRNG seeded on BLID,SCID,TXID. First form gives a uint64, second form returns
random number in the range 0 - (limit), 0 is inclusive, limit is exclusive random number in the range 0 - (limit), 0 is inclusive, limit is exclusive.
String SCID() String SCID()
============== ==============
Returns SMART CONTRACT ID which is currently running Returns SMART CONTRACT ID which is currently running.
String BLID() String BLID()
============== ==============
Returns current BLOCK ID which contains current execution-in-progress TXID Returns current BLOCK ID which contains current execution-in-progress TXID.
String TXID() String TXID()
============= =============
@ -35,28 +34,28 @@ Returns current TXID which is execution-in-progress.
Uint64 BLOCK_HEIGHT() Uint64 BLOCK_HEIGHT()
===================== =====================
Returns current chain height of BLID() Returns current chain height of BLID().
Uint64 BLOCK_TOPOHEIGHT() Uint64 BLOCK_TOPOHEIGHT()
=========================== ===========================
Returns current topoheight of BLID() Returns current topoheight of BLID().
String SIGNER() String SIGNER()
================= =================
Returns address of who signed this transaction Returns address of who signed/sent this transaction. SIGNER() returns the raw address.
Uint64 IS_ADDRESS_VALID(p String) Uint64 IS_ADDRESS_VALID(p String)
================================= =================================
Returns 1 if address is valid, 0 otherwise Returns 1 if address is valid, 0 otherwise.
String ADDRESS_RAW(p String) String ADDRESS_RAW(p String)
============================ ============================
Returns address in RAW form as 33 byte keys, stripping away textual/presentation form. 2 address should always be compared in RAW form Returns address in RAW form as 33 byte keys, stripping away textual/presentation form. Addresses should always be compared in RAW form.
SEND_DERO_TO_ADDRESS(a String, amount Uint64) SEND_DERO_TO_ADDRESS(a String, amount Uint64)
============================================== ==============================================
Sends amount DERO from SC DERO balance to a address which should be raw form. address must in string form DERO/DETO form Sends amount DERO from SC DERO balance to a address which should be raw form. address must in string form DERO/DETO form.
If the SC does not have enough balance, it will panic If the SC does not have enough balance, it will panic
@ -64,6 +63,12 @@ ADD_VALUE(a String, amount Uint64)
==================================== ====================================
Send specific number of token to specific account. Send specific number of token to specific account.
If account is bring touched for the first time, it is done simply. If account is bring touched for the first time, it is done simply.
If account is already initialized ( it already has some balance, but SC does not know how much). So, it gives additional balance homomorphically If account is already initialized ( it already has some balance, but SC does not know how much). So, it gives additional balance homomorphically.
DEROVALUE()
============
DEROVALUE() gives DERO transacted/deposited in current transaction.
TOKENVALUE()
============
TOKENVALUE() gives particular token transacted/deposited in currrent transaction.