MySQL 8.4.3
Source Code Documentation
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An adapter class to support iteration over an iterator of Item * (typically mem_root_deque<Item *>), while skipping over items that are hidden (item->hidden == true). More...
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Classes | |
class | VisibleFieldsAdapter< Iterator > |
class | VisibleFieldsContainer< Container, Iterator > |
Functions | |
auto | VisibleFields (mem_root_deque< Item * > &fields) |
auto | VisibleFields (const mem_root_deque< Item * > &fields) |
An adapter class to support iteration over an iterator of Item * (typically mem_root_deque<Item *>), while skipping over items that are hidden (item->hidden == true).
This is such a common operation that it warrants having its own adapter. You can either do
for (Item *item : VisibleFields(fields))
or use select->visible_fields().
Behavior is undefined if you modify the hidden flag of an item during iteration.
TODO(sgunders): When we get C++20, replace with an std::views::filter.
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