Returned Data
Returned data are variables that are created automatically when executing FCT. This variables holds all the returned values from previous called functions of the current FCT execution.
How to use
The returned data are kept in bytes format for each call. That means that in order to use a variable there is a need to tell the FCT engine from what call and with what offset the value exist.
Usage
0xFD000....TTTTLLLL LLLL holds the call number (starting with 1) TTTT holds the offset in 32 bytes blocks inside the call
0xFD00000000000000000000000000000000020003 means the 64-96 bits of the returned data from the third call on the FCT will be used
FD stands for "Future Data"
0xFDB000....TTTTLLLL LLLL holds the call number (starting with 1) TTTT holds the reverse offset (backwards) in 32 bytes blocks inside the call
0xFDB0000000000000000000000000000000000003 means the last 32 bits of the returned data from the third call on the FCT will be used
FDB stands for "Future Data in Backwards"
External variable use four range of values:
For address types:
0xFD00000000000000000000000000000000000001
...
0xFD000000000000000000000000000000ffffffff
and
0xFDB0000000000000000000000000000000000001
...
0xFDB00000000000000000000000000000ffffffff
For uint256 and bytes32 types:
0xFD00000000000000000000000000000000000000000000000000000000000001
...
0xFD000000000000000000000000000000000000000000000000000000ffffffff
and
0xFDB0000000000000000000000000000000000000000000000000000000000001
...
0xFDB00000000000000000000000000000000000000000000000000000ffffffff
Call number must be smaller than the current running call
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