demos/mix_eigen_and_c/binary_library.h

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

// This is a pure C header, no C++ here.
// The functions declared here will be implemented in C++ but
// we don't have to know, because thanks to the extern "C" syntax,
// they will be compiled to C object code.

#ifdef __cplusplus
extern "C" {
#endif

// just dummy empty structs to give different pointer types,
// instead of using void* which would be type unsafe
struct C_MatrixXd {};
struct C_Map_MatrixXd {};

// the C_MatrixXd class, wraps some of the functionality
// of Eigen::MatrixXd.
struct C_MatrixXd *MatrixXd_new(int rows, int cols);
void MatrixXd_delete(struct C_MatrixXd *m);
double *MatrixXd_data(struct C_MatrixXd *m);
void MatrixXd_set_zero(struct C_MatrixXd *m);
void MatrixXd_resize(struct C_MatrixXd *m, int rows, int cols);
void MatrixXd_copy(struct C_MatrixXd *dst, const struct C_MatrixXd *src);
void MatrixXd_copy_map(struct C_MatrixXd *dst, const struct C_Map_MatrixXd *src);
void MatrixXd_set_coeff(struct C_MatrixXd *m, int i, int j, double coeff);
double MatrixXd_get_coeff(const struct C_MatrixXd *m, int i, int j);
void MatrixXd_print(const struct C_MatrixXd *m);
void MatrixXd_add(const struct C_MatrixXd *m1, const struct C_MatrixXd *m2, struct C_MatrixXd *result);
void MatrixXd_multiply(const struct C_MatrixXd *m1, const struct C_MatrixXd *m2, struct C_MatrixXd *result);

// the C_Map_MatrixXd class, wraps some of the functionality
// of Eigen::Map<MatrixXd>
struct C_Map_MatrixXd *Map_MatrixXd_new(double *array, int rows, int cols);
void Map_MatrixXd_delete(struct C_Map_MatrixXd *m);
void Map_MatrixXd_set_zero(struct C_Map_MatrixXd *m);
void Map_MatrixXd_copy(struct C_Map_MatrixXd *dst, const struct C_Map_MatrixXd *src);
void Map_MatrixXd_copy_matrix(struct C_Map_MatrixXd *dst, const struct C_MatrixXd *src);
void Map_MatrixXd_set_coeff(struct C_Map_MatrixXd *m, int i, int j, double coeff);
double Map_MatrixXd_get_coeff(const struct C_Map_MatrixXd *m, int i, int j);
void Map_MatrixXd_print(const struct C_Map_MatrixXd *m);
void Map_MatrixXd_add(const struct C_Map_MatrixXd *m1, const struct C_Map_MatrixXd *m2, struct C_Map_MatrixXd *result);
void Map_MatrixXd_multiply(const struct C_Map_MatrixXd *m1, const struct C_Map_MatrixXd *m2,
                           struct C_Map_MatrixXd *result);

#ifdef __cplusplus
}  // end extern "C"
#endif