CURSOR/POSITIONED?
Checks if the cursor is positioned
Input stack: cursor
Output stack: b
If there is a current key/value pair set in the cursor, 1 will be pushed onto the stack.
Otherwise, 0 will be pushed.
PumpkinDB> ["1" "2" ASSOC COMMIT] WRITE [CURSOR CURSOR/POSITIONED?] READ
0
Allocation
Allocates for values to be put onto the stack
Errors
NoTransaction error if there's no current write transaction
InvalidValue error if the cursor identifier is incorrect or expired
Tests
positioned : ["1" "2" ASSOC COMMIT] WRITE [CURSOR DUP CURSOR/FIRST SWAP CURSOR/POSITIONED? AND] READ.
not_positioned : [CURSOR CURSOR/POSITIONED? NOT] READ.
requires_txn : ["1" CURSOR/POSITIONED?] TRY UNWRAP 0x08 EQUAL?.
empty_stack : [[CURSOR/POSITIONED?] TRY] READ UNWRAP 0x04 EQUAL?.
invalid_cursor : [["1" CURSOR/POSITIONED?] READ] TRY UNWRAP 0x03 EQUAL?.