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add some comments cheap_eqs

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-06-19 13:22:39 -07:00
parent 115ae8fe14
commit 3bde9f54d8
1 changed files with 6 additions and 3 deletions
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9
src/math/lp/lp_bound_propagator.h
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@ -21,7 +21,11 @@ class lp_bound_propagator {
// The set of all pair are organised in a tree.
// The edges of the tree are of the form ((row,x), (row, y)) for an offset row,
// or ((row, u), (other_row, v)) where the "other_row" is an offset row too,
// and u, v reference the same column
// and u, v reference the same column.
// Vertices with m_neg set to false grow with the same rate as the root.
// Vertices with m_neq set to true diminish with the same rate as the roow grows.
// When two vertices with the same m_neg have the same value of columns
// then we have an equality betweet the columns.
class vertex {
unsigned m_row;
unsigned m_column;
@ -29,8 +33,7 @@ class lp_bound_propagator {
vertex* m_parent;
unsigned m_level; // the distance in hops to the root;
// it is handy to find the common ancestor
bool m_neg; // if false then the offset means the distance from the root to column value
// if true, then - to minus column value
bool m_neg; // false if grows with the root, true if grows with -root
public:
vertex() {}
vertex(unsigned row,