/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
 *                                                                          *
 *   Copyright (c) 2005-2026 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *                                                                          *
 *   The aGrUM/pyAgrum library is free software; you can redistribute it    *
 *   and/or modify it under the terms of either :                           *
 *                                                                          *
 *    - the GNU Lesser General Public License as published by               *
 *      the Free Software Foundation, either version 3 of the License,      *
 *      or (at your option) any later version,                              *
 *    - the MIT license (MIT),                                              *
 *    - or both in dual license, as here.                                   *
 *                                                                          *
 *   (see https://agrum.gitlab.io/articles/dual-licenses-lgplv3mit.html)    *
 *                                                                          *
 *   This aGrUM/pyAgrum library is distributed in the hope that it will be  *
 *   useful, but WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,          *
 *   INCLUDING BUT NOT LIMITED TO THE WARRANTIES MERCHANTABILITY or FITNESS *
 *   FOR A PARTICULAR PURPOSE  AND NONINFRINGEMENT. IN NO EVENT SHALL THE   *
 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,        *
 *   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR  *
 *   OTHER DEALINGS IN THE SOFTWARE.                                        *
 *                                                                          *
 *   See LICENCES for more details.                                         *
 *                                                                          *
 *   SPDX-FileCopyrightText: Copyright 2005-2026                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *   SPDX-License-Identifier: LGPL-3.0-or-later OR MIT                      *
 *                                                                          *
 *   Contact  : info_at_agrum_dot_org                                       *
 *   homepage : http://agrum.gitlab.io                                      *
 *   gitlab   : https://gitlab.com/agrumery/agrum                           *
 *                                                                          *
 ****************************************************************************/


/**
 * @file
 * @brief Template trick for efficient development
 *
 * @author Pierre-Henri WUILLEMIN(_at_LIP6) and Jean-Christophe MAGNAN and Christophe
 * GONZALES(_at_AMU)
 */

#ifndef GUM_TEMPLATE_STRATEGY_H
#define GUM_TEMPLATE_STRATEGY_H

namespace gum {

  template < int v >
  struct Int2Type {
    enum { value = v };
  };

  enum TESTNAME { GTEST = 1, CHI2TEST = 2, LEASTSQUARETEST = 3 };

  template < TESTNAME, class A, class B, class C >
  struct TestSelect {
    using type = A;
  };

  template < class A, class B, class C >
  struct TestSelect< CHI2TEST, A, B, C > {
    using type = B;
  };

  template < class A, class B, class C >
  struct TestSelect< LEASTSQUARETEST, A, B, C > {
    using type = C;
  };

  template < bool, class A, class B >
  struct ValueSelect {
    using type = A;
  };

  template < class A, class B >
  struct ValueSelect< false, A, B > {
    using type = B;
  };

  enum LEARNERNAME { IMDDILEARNER = 1, ITILEARNER = 2 };

  template < LEARNERNAME, class A, class B >
  struct LearnerSelect {
    using type = A;
  };

  template < class A, class B >
  struct LearnerSelect< ITILEARNER, A, B > {
    using type = B;
  };

}   // end of namespace gum

#endif   // GUM_TEMPLATE_STRATEGY_H
