replace boost::function with std::function

gtsam/basis/Chebyshev2.h

@@ -36,8 +36,6 @@
 #include <gtsam/base/OptionalJacobian.h>
 #include <gtsam/basis/Basis.h>
 
-#include <boost/function.hpp>
-
 namespace gtsam {
 
 /**
@@ -134,7 +132,7 @@ class GTSAM_EXPORT Chebyshev2 : public Basis<Chebyshev2> {
    * Create matrix of values at Chebyshev points given vector-valued function.
    */
   template <size_t M>
-  static Matrix matrix(boost::function<Eigen::Matrix<double, M, 1>(double)> f,
+  static Matrix matrix(std::function<Eigen::Matrix<double, M, 1>(double)> f,
                        size_t N, double a = -1, double b = 1) {
     Matrix Xmat(M, N);
     for (size_t j = 0; j < N; j++) {

gtsam/basis/tests/testChebyshev2.cpp

@@ -118,7 +118,7 @@ TEST(Chebyshev2, InterpolateVector) {
   EXPECT(assert_equal(expected, fx(X, actualH), 1e-9));
 
   // Check derivative
-  boost::function<Vector2(ParameterMatrix<2>)> f = boost::bind(
+  std::function<Vector2(ParameterMatrix<2>)> f = boost::bind(
       &Chebyshev2::VectorEvaluationFunctor<2>::operator(), fx, _1, boost::none);
   Matrix numericalH =
       numericalDerivative11<Vector2, ParameterMatrix<2>, 2 * N>(f, X);

gtsam/discrete/DecisionTree.h

@@ -22,7 +22,7 @@
 #include <gtsam/base/types.h>
 #include <gtsam/discrete/Assignment.h>
 
-#include <boost/function.hpp>
+#include <boost/shared_ptr.hpp>
 #include <functional>
 #include <iostream>
 #include <map>

gtsam/geometry/tests/testPoint3.cpp

@@ -19,8 +19,6 @@
 #include <gtsam/base/numericalDerivative.h>
 #include <gtsam/geometry/Point3.h>
 
-#include <boost/function.hpp>
-
 using namespace std::placeholders;
 using namespace gtsam;