C++ Reference: class IntExpr

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The class IntExpr is the base of all integer expressions in constraint programming. It contains the basic protocol for an expression:
   - setting and modifying its bound
   - querying if it is bound
   - listening to events modifying its bounds
   - casting it into a variable (instance of IntVar)

Method
`Accept`	Return type: `virtual void` Arguments: `ModelVisitor* const visitor` Accepts the given visitor.
`Bound`	Return type: `virtual bool` Returns true if the min and the max of the expression are equal.
`IntExpr`	Return type: `explicit` Arguments: `Solver* const s`
`~IntExpr`
`IsVar`	Return type: `virtual bool` Returns true if the expression is indeed a variable.
`Max`	Return type: `virtual int64`
`Min`	Return type: `virtual int64`
`Range`	Return type: `virtual void` Arguments: `int64* l, int64* u` By default calls Min() and Max(), but can be redefined when Min and Max code can be factorized.
`SetMax`	Return type: `virtual void` Arguments: `int64 m`
`SetMin`	Return type: `virtual void` Arguments: `int64 m`
`SetRange`	Return type: `virtual void` Arguments: `int64 l, int64 u` This method sets both the min and the max of the expression.
`SetValue`	Return type: `virtual void` Arguments: `int64 v` This method sets the value of the expression.
`Var`	Return type: `virtual IntVar*` Creates a variable from the expression.
`VarWithName`	Return type: `IntVar*` Arguments: `const std::string& name` Creates a variable from the expression and set the name of the resulting var. If the expression is already a variable, then it will set the name of the expression, possibly overwriting it. This is just a shortcut to Var() followed by set_name().
`WhenRange`	Return type: `virtual void` Arguments: `Demon* d` Attach a demon that will watch the min or the max of the expression.
`WhenRange`	Return type: `void` Arguments: `Solver::Closure closure` Attach a demon that will watch the min or the max of the expression.
`WhenRange`	Return type: `void` Arguments: `Solver::Action action` Attach a demon that will watch the min or the max of the expression.