Eigen/src/Core/util/StaticAssert.h

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2008 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/.

#ifndef EIGEN_STATIC_ASSERT_H
#define EIGEN_STATIC_ASSERT_H

/* Some notes on Eigen's static assertion mechanism:
 *
 *  - in EIGEN_STATIC_ASSERT(CONDITION,MSG) the parameter CONDITION must be a compile time boolean
 *    expression, and MSG an enum listed in struct internal::static_assertion<true>
 *
 *  - currently EIGEN_STATIC_ASSERT can only be used in function scope
 *
 */

#ifndef EIGEN_STATIC_ASSERT
#ifndef EIGEN_NO_STATIC_ASSERT

#define EIGEN_STATIC_ASSERT(X,MSG) static_assert(X,#MSG);

#else // EIGEN_NO_STATIC_ASSERT

#define EIGEN_STATIC_ASSERT(CONDITION,MSG)

#endif // EIGEN_NO_STATIC_ASSERT
#endif // EIGEN_STATIC_ASSERT

// static assertion failing if the type \a TYPE is not a vector type
#define EIGEN_STATIC_ASSERT_VECTOR_ONLY(TYPE) \
  EIGEN_STATIC_ASSERT(TYPE::IsVectorAtCompileTime, \
                      YOU_TRIED_CALLING_A_VECTOR_METHOD_ON_A_MATRIX)

// static assertion failing if the type \a TYPE is not fixed-size
#define EIGEN_STATIC_ASSERT_FIXED_SIZE(TYPE) \
  EIGEN_STATIC_ASSERT(TYPE::SizeAtCompileTime!=Eigen::Dynamic, \
                      YOU_CALLED_A_FIXED_SIZE_METHOD_ON_A_DYNAMIC_SIZE_MATRIX_OR_VECTOR)

// static assertion failing if the type \a TYPE is not dynamic-size
#define EIGEN_STATIC_ASSERT_DYNAMIC_SIZE(TYPE) \
  EIGEN_STATIC_ASSERT(TYPE::SizeAtCompileTime==Eigen::Dynamic, \
                      YOU_CALLED_A_DYNAMIC_SIZE_METHOD_ON_A_FIXED_SIZE_MATRIX_OR_VECTOR)

// static assertion failing if the type \a TYPE is not a vector type of the given size
#define EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(TYPE, SIZE) \
  EIGEN_STATIC_ASSERT(TYPE::IsVectorAtCompileTime && TYPE::SizeAtCompileTime==SIZE, \
                      THIS_METHOD_IS_ONLY_FOR_VECTORS_OF_A_SPECIFIC_SIZE)

// static assertion failing if the type \a TYPE is not a vector type of the given size
#define EIGEN_STATIC_ASSERT_MATRIX_SPECIFIC_SIZE(TYPE, ROWS, COLS) \
  EIGEN_STATIC_ASSERT(TYPE::RowsAtCompileTime==ROWS && TYPE::ColsAtCompileTime==COLS, \
                      THIS_METHOD_IS_ONLY_FOR_MATRICES_OF_A_SPECIFIC_SIZE)

// static assertion failing if the two vector expression types are not compatible (same fixed-size or dynamic size)
#define EIGEN_STATIC_ASSERT_SAME_VECTOR_SIZE(TYPE0,TYPE1) \
  EIGEN_STATIC_ASSERT( \
      (int(TYPE0::SizeAtCompileTime)==Eigen::Dynamic \
    || int(TYPE1::SizeAtCompileTime)==Eigen::Dynamic \
    || int(TYPE0::SizeAtCompileTime)==int(TYPE1::SizeAtCompileTime)),\
    YOU_MIXED_VECTORS_OF_DIFFERENT_SIZES)

#define EIGEN_PREDICATE_SAME_MATRIX_SIZE(TYPE0,TYPE1) \
     ( \
        (int(Eigen::internal::size_of_xpr_at_compile_time<TYPE0>::ret)==0 && int(Eigen::internal::size_of_xpr_at_compile_time<TYPE1>::ret)==0) \
    || (\
          (int(TYPE0::RowsAtCompileTime)==Eigen::Dynamic \
        || int(TYPE1::RowsAtCompileTime)==Eigen::Dynamic \
        || int(TYPE0::RowsAtCompileTime)==int(TYPE1::RowsAtCompileTime)) \
      &&  (int(TYPE0::ColsAtCompileTime)==Eigen::Dynamic \
        || int(TYPE1::ColsAtCompileTime)==Eigen::Dynamic \
        || int(TYPE0::ColsAtCompileTime)==int(TYPE1::ColsAtCompileTime))\
       ) \
     )

#define EIGEN_STATIC_ASSERT_NON_INTEGER(TYPE) \
    EIGEN_STATIC_ASSERT(!Eigen::NumTraits<TYPE>::IsInteger, THIS_FUNCTION_IS_NOT_FOR_INTEGER_NUMERIC_TYPES)


// static assertion failing if it is guaranteed at compile-time that the two matrix expression types have different sizes
#define EIGEN_STATIC_ASSERT_SAME_MATRIX_SIZE(TYPE0,TYPE1) \
  EIGEN_STATIC_ASSERT( \
     EIGEN_PREDICATE_SAME_MATRIX_SIZE(TYPE0,TYPE1),\
    YOU_MIXED_MATRICES_OF_DIFFERENT_SIZES)

#define EIGEN_STATIC_ASSERT_SIZE_1x1(TYPE) \
      EIGEN_STATIC_ASSERT((TYPE::RowsAtCompileTime == 1 || TYPE::RowsAtCompileTime == Eigen::Dynamic) && \
                          (TYPE::ColsAtCompileTime == 1 || TYPE::ColsAtCompileTime == Eigen::Dynamic), \
                          THIS_METHOD_IS_ONLY_FOR_1x1_EXPRESSIONS)

#define EIGEN_STATIC_ASSERT_LVALUE(Derived) \
      EIGEN_STATIC_ASSERT(Eigen::internal::is_lvalue<Derived>::value, \
                          THIS_EXPRESSION_IS_NOT_A_LVALUE__IT_IS_READ_ONLY)

#define EIGEN_STATIC_ASSERT_ARRAYXPR(Derived) \
      EIGEN_STATIC_ASSERT((Eigen::internal::is_same<typename Eigen::internal::traits<Derived>::XprKind, ArrayXpr>::value), \
                          THIS_METHOD_IS_ONLY_FOR_ARRAYS_NOT_MATRICES)

#define EIGEN_STATIC_ASSERT_SAME_XPR_KIND(Derived1, Derived2) \
      EIGEN_STATIC_ASSERT((Eigen::internal::is_same<typename Eigen::internal::traits<Derived1>::XprKind, \
                                             typename Eigen::internal::traits<Derived2>::XprKind \
                                            >::value), \
                          YOU_CANNOT_MIX_ARRAYS_AND_MATRICES)

// Check that a cost value is positive, and that is stay within a reasonable range
// TODO this check could be enabled for internal debugging only
#define EIGEN_INTERNAL_CHECK_COST_VALUE(C) \
      EIGEN_STATIC_ASSERT((C)>=0 && (C)<=HugeCost*HugeCost, EIGEN_INTERNAL_ERROR_PLEASE_FILE_A_BUG_REPORT__INVALID_COST_VALUE);

#endif // EIGEN_STATIC_ASSERT_H