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More boost-style traits

release/4.3a0
dellaert 2014-10-18 14:16:24 +02:00
parent 4c33444415
commit f08dc6c031
1 changed files with 37 additions and 10 deletions
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47
gtsam_unstable/nonlinear/tests/testExpression.cpp
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@ -324,13 +324,38 @@ struct SnavelyReprojectionError {
/* ************************************************************************* */
// manifold_traits prototype
// Same style as Boost.TypeTraits
// All meta-functions below ever only declare a single type
// or a type/value/value_type
#include <boost/static_assert.hpp>
#include <type_traits>
// is manifold
template<typename T>
struct is_manifold: public false_type {
};
// dimension
template<typename T>
struct dimension: public integral_constant<size_t, T::dimension> {
};
// Fixed size Eigen::Matrix type
template<int M, int N, int Options>
struct is_manifold<Eigen::Matrix<double, M, N, Options> > : public true_type {
};
template<int M, int N, int Options>
struct dimension<Eigen::Matrix<double, M, N, Options> > : public integral_constant<
size_t, M * N> {
BOOST_STATIC_ASSERT(M!=Eigen::Dynamic && N!=Eigen::Dynamic);
};
template<typename T>
struct manifold_traits {
typedef T type;
static const size_t dimension = T::dimension;
typedef Eigen::Matrix<double, dimension, 1> tangent;
static const size_t dim = dimension<T>::value;
typedef Eigen::Matrix<double, dim, 1> tangent;
static tangent localCoordinates(const T& t1, const T& t2) {
return t1.localCoordinates(t2);
}
@ -344,8 +369,8 @@ template<int M, int N, int Options>
struct manifold_traits<Eigen::Matrix<double, M, N, Options> > {
BOOST_STATIC_ASSERT(M!=Eigen::Dynamic && N!=Eigen::Dynamic);
typedef Eigen::Matrix<double, M, N, Options> type;
static const size_t dimension = M * N;
typedef Eigen::Matrix<double, dimension, 1> tangent;
static const size_t dim = dimension<type>::value;
typedef Eigen::Matrix<double, dim, 1> tangent;
static tangent localCoordinates(const type& t1, const type& t2) {
type diff = t2 - t1;
return tangent(Eigen::Map<tangent>(diff.data()));
@ -358,8 +383,8 @@ struct manifold_traits<Eigen::Matrix<double, M, N, Options> > {
// Test dimension traits
TEST(Expression, Traits) {
EXPECT_LONGS_EQUAL(2, manifold_traits<Point2>::dimension);
EXPECT_LONGS_EQUAL(8, manifold_traits<Matrix24>::dimension);
EXPECT_LONGS_EQUAL(2, dimension<Point2>::value);
EXPECT_LONGS_EQUAL(8, dimension<Matrix24>::value);
}
/* ************************************************************************* */
@ -367,10 +392,12 @@ TEST(Expression, Traits) {
template<typename Y, typename X>
Matrix numericalDerivative(boost::function<Y(const X&)> h, const X& x,
double delta = 1e-5) {
BOOST_STATIC_ASSERT(is_manifold<Y>::value);
BOOST_STATIC_ASSERT(is_manifold<X>::value);
Y hx = h(x);
double factor = 1.0 / (2.0 * delta);
static const size_t M = manifold_traits<Y>::dimension;
static const size_t N = manifold_traits<X>::dimension;
static const size_t M = dimension<Y>::value;
static const size_t N = dimension<X>::value;
Eigen::Matrix<double, N, 1> d;
Matrix H = zeros(M, N);
for (size_t j = 0; j < N; j++) {
@ -441,9 +468,9 @@ TEST(Expression, AutoDiff2) {
SnavelyReprojectionError snavely;
// Make arguments
Vector9 P;
Vector9 P; // zero rotation, (0,5,0) translation, focal length 1
P << 0, 0, 0, 0, 5, 0, 1, 0, 0;
Vector3 X(10, 0, -5);
Vector3 X(10, 0, -5); // negative Z-axis convention of Snavely!
// Apply the mapping, to get image point b_x.
Vector expected = Vector2(2, 1);