CURSOR/NEXT?

Sets the cursor at the next key value

Input stack: cursor

Output stack: b

If there is a next key/value pair in the database, 1 will be pushed onto the stack. Otherwise, 0 will be pushed and the cursor will be moved.

Useful in conjunction with CURSOR/CUR

PumpkinDB> ["1" "2" ASSOC "2" "2" ASSOC COMMIT] WRITE [CURSOR 'c SET c ?CURSOR/FIRST DROP c CURSOR/NEXT?] READ
1

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

works : ["1" "2" ASSOC "2" "2" ASSOC COMMIT] WRITE [CURSOR 'c SET c ?CURSOR/FIRST DROP c CURSOR/NEXT?] READ.
requires_txn : ["1" CURSOR/NEXT?] TRY UNWRAP 0x08 EQUAL?.
empty_stack : [CURSOR/NEXT?] TRY UNWRAP 0x04 EQUAL?.
invalid_cursor : [["1" CURSOR/NEXT?] READ] TRY UNWRAP 0x03 EQUAL?.

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