C++ Reference: class MPVariable

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The class for variables of a Mathematical Programming (MP) model.

Method
`basis_status`	Return type: `MPSolver::BasisStatus` Advanced usage: returns the basis status of the variable in the current solution (only available for continuous problems). @see MPSolver::BasisStatus.
`branching_priority`	Return type: `int` Advanced usage: Certain MIP solvers (e.g. Gurobi or SCIP) allow you to set a per-variable priority for determining which variable to branch on. A value of 0 is treated as default, and is equivalent to not setting the branching priority. The solver looks first to branch on fractional variables in higher priority levels. As of 2019-05, only Gurobi and SCIP support setting branching priority; all other solvers will simply ignore this annotation.
`index`	Return type: `int` Returns the index of the variable in the MPSolver::variables_.
`integer`	Return type: `bool` Returns the integrality requirement of the variable.
`lb`	Return type: `double` Returns the lower bound.
`name`	Return type: `const std::string&` Returns the name of the variable.
`reduced_cost`	Return type: `double` Advanced usage: returns the reduced cost of the variable in the current solution (only available for continuous problems).
`SetBounds`	Return type: `void` Arguments: `double lb, double ub` Sets both the lower and upper bounds.
`SetBranchingPriority`	Return type: `void` Arguments: `int priority`
`SetInteger`	Return type: `void` Arguments: `bool integer` Sets the integrality requirement of the variable.
`SetLB`	Return type: `void` Arguments: `double lb` Sets the lower bound.
`SetUB`	Return type: `void` Arguments: `double ub` Sets the upper bound.
`solution_value`	Return type: `double` Returns the value of the variable in the current solution. If the variable is integer, then the value will always be an integer (the underlying solver handles floating-point values only, but this function automatically rounds it to the nearest integer; see: man 3 round).
`ub`	Return type: `double` Returns the upper bound.
`unrounded_solution_value`	Return type: `double` Advanced usage: unrounded solution value. The returned value won't be rounded to the nearest integer even if the variable is integer.