MySQL 8.4.0
Source Code Documentation

The type for a possible transition from one state to another while holding at least a given set of latches. More...
#include <ut0stateful_latching_rules.h>
Public Member Functions  
edge_t (node_t from, std::initializer_list< int > &&idxs, node_t to)  
Creates a description of one of allowed state transitions from given state to another while holding given latches. More...  
Public Attributes  
node_t  m_from 
The old state from which the transition starts. More...  
latches_set_t  m_latches 
The required subset of latches for this particular transition. More...  
node_t  m_to 
The new state from to which the transition leads. More...  
The type for a possible transition from one state to another while holding at least a given set of latches.

inline 
Creates a description of one of allowed state transitions from given state to another while holding given latches.
For example {BUF_IO_READ, {0, 2}, BUF_IO_NONE} says a if a thread holds latches 0 and 2 then it can transition from BUF_IO_READ to BUF_IO_NONE.
[in]  from  The old state from which the transition starts 
[in]  idxs  The list of integers in range <0,LATCHES_COUNT) used to construct set of latches for this edge. 
[in]  to  The new state from to which the transition leads. 
node_t ut::Stateful_latching_rules< Node, LATCHES_COUNT >::edge_t::m_from 
The old state from which the transition starts.
latches_set_t ut::Stateful_latching_rules< Node, LATCHES_COUNT >::edge_t::m_latches 
The required subset of latches for this particular transition.
Note that there might be several edges for the same from>to pair, which means that a thread can pick any of them for which it has the required latches.
node_t ut::Stateful_latching_rules< Node, LATCHES_COUNT >::edge_t::m_to 
The new state from to which the transition leads.