Function set_any_field_integer 

pub unsafe fn set_any_field_integer(
    buf: &mut [u8],
    table_loc: usize,
    field: &Field<'_>,
    v: i64,
) -> FlatbufferResult<()>

Sets any table field with the value of a 64-bit integer. Returns error if the field is not originally set or is with non-scalar value or the provided value cannot be cast into the field type.

Safety

[buf] must contain a valid root table and valid offset to it.