C++ Reference: class LinearExpr

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Method
`AddConstant`	Return type: `LinearExpr&` Arguments: `int64 value` Adds a constant value to the linear expression.
`AddTerm`	Return type: `void` Arguments: `IntVar var, int64 coeff` Adds a term (var * coeff) to the linear expression.
`AddVar`	Return type: `void` Arguments: `IntVar var` Adds a single integer variable to the linear expression.
`BooleanScalProd`	Return type: `static LinearExpr` Arguments: `absl::Span<const BoolVar> vars, absl::Span<const int64> coeffs` Constructs the scalar product of Booleans and coefficients.
`BooleanSum`	Return type: `static LinearExpr` Arguments: `absl::Span<const BoolVar> vars` Constructs the sum of a list of Booleans.
`coefficients`	Return type: `const std::vector<int64>&` Returns the vector of coefficients.
`constant`	Return type: `int64` Returns the constant term.
`LinearExpr`
`LinearExpr`	Arguments: `BoolVar var`
`LinearExpr`	Arguments: `IntVar var` Constructs a linear expression from an integer variable.
`LinearExpr`	Arguments: `int64 constant` Constructs a constant linear expression.
`ScalProd`	Return type: `static LinearExpr` Arguments: `absl::Span<const IntVar> vars, absl::Span<const int64> coeffs` Constructs the scalar product of variables and coefficients.
`Sum`	Return type: `static LinearExpr` Arguments: `absl::Span<const IntVar> vars` Constructs the sum of a list of variables.
`Term`	Return type: `static LinearExpr` Arguments: `IntVar var, int64 coefficient` Construncts var * coefficient.
`variables`	Return type: `const std::vector<IntVar>&` Returns the vector of variables.