pub fn new<OF: OrderedField>(general_form: &GeneralForm<OF>, counters: &Counters<OF>) -> Self
    where
        for<'r> &'r OF: OrderedFieldRef<OF>,
    {
        Self {
            bound: counters.constraint.iter().enumerate()
                .filter(|&(_, &count)| count == 1)
                .map(|(i, _)| i).collect(),
            activity: ActivityQueue::new(counters.activity.iter().enumerate()
                .flat_map(|(i, &(lower_count, upper_count))| {
                    let mut sides = Vec::with_capacity(2);
                    if counters.constraint[i] > 1 {
                        if lower_count <= 1 {
                            sides.push((i, BoundDirection::Lower));
                        }
                        if upper_count <= 1 {
                            sides.push((i, BoundDirection::Upper));
                        }
                    }
                    sides
                }).collect()),

            slack: counters.variable.iter().enumerate()
                .filter(|&(_, &count)| count == 1)
                .filter(|&(j, _)| general_form.variables[j].cost.is_zero())
                .map(|(j, _)| j).collect(),
            substitution: general_form.variables.iter().enumerate()
                // Columns with no values get substituted right away, as they removal doesn't lead
                // to any further actions. The only values that should be put in the queue are those
                // that lead to other actions, that is, have a nonzero counter.
                .filter(|&(j, _)| counters.variable[j] > 0)
                .filter_map(|(j, variable)| variable.is_fixed().map(|_| j))
                .collect(),
        }
    }
/// Create a new instance.
///
/// Requires iteration over all counters. This method also demonstrates, which constraints or
/// variables get added to which queue under which condition.
///
/// TODO(OPTIMIZATION): Are these iterations efficiently done after compiler optimizations?
///
/// # Arguments
///
/// * `general_form`: Problem being presolved.
/// * `counters`: Counters initialized on the problem in the other argument.
///
/// # Return value
///
/// A new instance.
Create a new instance.
Requires iteration over all counters. This method also demonstrates, which constraints or
variables get added to which queue under which condition.


Create a new instance . Requires iteration over all counters . This method also demonstrates which constraints or variables get added to which queue under which condition .
pub fn new<OF: OrderedField>(general_form: &GeneralForm<OF>, counters: &Counters<OF>) -> Self
    where
        for<'r> &'r OF: OrderedFieldRef<OF>,
    {
        Self {
            bound: counters.constraint.iter().enumerate()
                .filter(|&(_, &count)| count == 1)
                .map(|(i, _)| i).collect(),
            activity: ActivityQueue::new(counters.activity.iter().enumerate()
                .flat_map(|(i, &(lower_count, upper_count))| {
                    let mut sides = Vec::with_capacity(2);
                    if counters.constraint[i] > 1 {
                        if lower_count <= 1 {
                            sides.push((i, BoundDirection::Lower));
                        }
                        if upper_count <= 1 {
                            sides.push((i, BoundDirection::Upper));
                        }
                    }
                    sides
                }).collect()),
            slack: counters.variable.iter().enumerate()
                .filter(|&(_, &count)| count == 1)
                .filter(|&(j, _)| general_form.variables[j].cost.is_zero())
                .map(|(j, _)| j).collect(),
            substitution: general_form.variables.iter().enumerate()
                // Columns with no values get substituted right away, as they removal doesn't lead
                // to any further actions. The only values that should be put in the queue are those
                // that lead to other actions, that is, have a nonzero counter.
                .filter(|&(j, _)| counters.variable[j] > 0)
                .filter_map(|(j, variable)| variable.is_fixed().map(|_| j))
                .collect(),
        }
    }
pub fn new < OF : OrderedField > ( general_form : & GeneralForm < OF > , counters : & Counters < OF > ) -> Self where for < ' r > & ' r OF : OrderedFieldRef < OF > , { Self { bound : counters . constraint . iter ( ) . enumerate ( ) . filter ( | & ( _ , & count ) | count == 1 ) . map ( | ( i , _ ) | i ) . collect ( ) , activity : ActivityQueue :: new ( counters . activity . iter ( ) . enumerate ( ) . flat_map ( | ( i , & ( lower_count , upper_count ) ) | { let mut sides = Vec :: with_capacity ( 2 ) ; if counters . constraint [ i ] > 1 { if lower_count <= 1 { sides . push ( ( i , BoundDirection :: Lower ) ) ; } if upper_count <= 1 { sides . push ( ( i , BoundDirection :: Upper ) ) ; } } sides } ) . collect ( ) ) , slack : counters . variable . iter ( ) . enumerate ( ) . filter ( | & ( _ , & count ) | count == 1 ) . filter ( | & ( j , _ ) | general_form . variables [ j ] . cost . is_zero ( ) ) . map ( | ( j , _ ) | j ) . collect ( ) , substitution : general_form . variables . iter ( ) . enumerate ( ) // Columns with no values get substituted right away, as they removal doesn't lead // to any further actions. The only values that should be put in the queue are those // that lead to other actions, that is, have a nonzero counter. . filter ( | & ( j , _ ) | counters . variable [ j ] > 0 ) . filter_map ( | ( j , variable ) | variable . is_fixed ( ) . map ( | _ | j ) ) . collect ( ) , } }
Create a new instance.
Create a new instance .
general_form
&GeneralForm<OF>
counters
&Counters<OF>
general_form
&GeneralForm<OF>
counters
&Counters<OF>
return value
A new instance.
A new instance .