meta.cpp (7339B)
1 // This file is part of Eigen, a lightweight C++ template library 2 // for linear algebra. 3 // 4 // Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr> 5 // 6 // This Source Code Form is subject to the terms of the Mozilla 7 // Public License v. 2.0. If a copy of the MPL was not distributed 8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 9 10 #include "main.h" 11 12 template<typename From, typename To> 13 bool check_is_convertible(const From&, const To&) 14 { 15 return internal::is_convertible<From,To>::value; 16 } 17 18 struct FooReturnType { 19 typedef int ReturnType; 20 }; 21 22 struct MyInterface { 23 virtual void func() = 0; 24 virtual ~MyInterface() {} 25 }; 26 struct MyImpl : public MyInterface { 27 void func() {} 28 }; 29 30 EIGEN_DECLARE_TEST(meta) 31 { 32 VERIFY((internal::conditional<(3<4),internal::true_type, internal::false_type>::type::value)); 33 VERIFY(( internal::is_same<float,float>::value)); 34 VERIFY((!internal::is_same<float,double>::value)); 35 VERIFY((!internal::is_same<float,float&>::value)); 36 VERIFY((!internal::is_same<float,const float&>::value)); 37 38 VERIFY(( internal::is_same<float,internal::remove_all<const float&>::type >::value)); 39 VERIFY(( internal::is_same<float,internal::remove_all<const float*>::type >::value)); 40 VERIFY(( internal::is_same<float,internal::remove_all<const float*&>::type >::value)); 41 VERIFY(( internal::is_same<float,internal::remove_all<float**>::type >::value)); 42 VERIFY(( internal::is_same<float,internal::remove_all<float**&>::type >::value)); 43 VERIFY(( internal::is_same<float,internal::remove_all<float* const *&>::type >::value)); 44 VERIFY(( internal::is_same<float,internal::remove_all<float* const>::type >::value)); 45 46 // test add_const 47 VERIFY(( internal::is_same< internal::add_const<float>::type, const float >::value)); 48 VERIFY(( internal::is_same< internal::add_const<float*>::type, float* const>::value)); 49 VERIFY(( internal::is_same< internal::add_const<float const*>::type, float const* const>::value)); 50 VERIFY(( internal::is_same< internal::add_const<float&>::type, float& >::value)); 51 52 // test remove_const 53 VERIFY(( internal::is_same< internal::remove_const<float const* const>::type, float const* >::value)); 54 VERIFY(( internal::is_same< internal::remove_const<float const*>::type, float const* >::value)); 55 VERIFY(( internal::is_same< internal::remove_const<float* const>::type, float* >::value)); 56 57 // test add_const_on_value_type 58 VERIFY(( internal::is_same< internal::add_const_on_value_type<float&>::type, float const& >::value)); 59 VERIFY(( internal::is_same< internal::add_const_on_value_type<float*>::type, float const* >::value)); 60 61 VERIFY(( internal::is_same< internal::add_const_on_value_type<float>::type, const float >::value)); 62 VERIFY(( internal::is_same< internal::add_const_on_value_type<const float>::type, const float >::value)); 63 64 VERIFY(( internal::is_same< internal::add_const_on_value_type<const float* const>::type, const float* const>::value)); 65 VERIFY(( internal::is_same< internal::add_const_on_value_type<float* const>::type, const float* const>::value)); 66 67 VERIFY(( internal::is_same<float,internal::remove_reference<float&>::type >::value)); 68 VERIFY(( internal::is_same<const float,internal::remove_reference<const float&>::type >::value)); 69 VERIFY(( internal::is_same<float,internal::remove_pointer<float*>::type >::value)); 70 VERIFY(( internal::is_same<const float,internal::remove_pointer<const float*>::type >::value)); 71 VERIFY(( internal::is_same<float,internal::remove_pointer<float* const >::type >::value)); 72 73 74 // is_convertible 75 STATIC_CHECK(( internal::is_convertible<float,double>::value )); 76 STATIC_CHECK(( internal::is_convertible<int,double>::value )); 77 STATIC_CHECK(( internal::is_convertible<int, short>::value )); 78 STATIC_CHECK(( internal::is_convertible<short, int>::value )); 79 STATIC_CHECK(( internal::is_convertible<double,int>::value )); 80 STATIC_CHECK(( internal::is_convertible<double,std::complex<double> >::value )); 81 STATIC_CHECK((!internal::is_convertible<std::complex<double>,double>::value )); 82 STATIC_CHECK(( internal::is_convertible<Array33f,Matrix3f>::value )); 83 STATIC_CHECK(( internal::is_convertible<Matrix3f&,Matrix3f>::value )); 84 STATIC_CHECK(( internal::is_convertible<Matrix3f&,Matrix3f&>::value )); 85 STATIC_CHECK(( internal::is_convertible<Matrix3f&,const Matrix3f&>::value )); 86 STATIC_CHECK(( internal::is_convertible<const Matrix3f&,Matrix3f>::value )); 87 STATIC_CHECK(( internal::is_convertible<const Matrix3f&,const Matrix3f&>::value )); 88 STATIC_CHECK((!internal::is_convertible<const Matrix3f&,Matrix3f&>::value )); 89 STATIC_CHECK((!internal::is_convertible<const Matrix3f,Matrix3f&>::value )); 90 STATIC_CHECK(!( internal::is_convertible<Matrix3f,Matrix3f&>::value )); 91 92 STATIC_CHECK(!( internal::is_convertible<int,int&>::value )); 93 STATIC_CHECK(( internal::is_convertible<const int,const int& >::value )); 94 95 //STATIC_CHECK((!internal::is_convertible<Matrix3f,Matrix3d>::value )); //does not even compile because the conversion is prevented by a static assertion 96 STATIC_CHECK((!internal::is_convertible<Array33f,int>::value )); 97 STATIC_CHECK((!internal::is_convertible<MatrixXf,float>::value )); 98 { 99 float f = 0.0f; 100 MatrixXf A, B; 101 VectorXf a, b; 102 VERIFY(( check_is_convertible(a.dot(b), f) )); 103 VERIFY(( check_is_convertible(a.transpose()*b, f) )); 104 VERIFY((!check_is_convertible(A*B, f) )); 105 VERIFY(( check_is_convertible(A*B, A) )); 106 } 107 108 #if (EIGEN_COMP_GNUC && EIGEN_COMP_GNUC <= 99) \ 109 || (EIGEN_COMP_CLANG && EIGEN_COMP_CLANG <= 909) \ 110 || (EIGEN_COMP_MSVC && EIGEN_COMP_MSVC <=1914) 111 // See http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1752, 112 // basically, a fix in the c++ standard breaks our c++98 implementation 113 // of is_convertible for abstract classes. 114 // So the following tests are expected to fail with recent compilers. 115 116 STATIC_CHECK(( !internal::is_convertible<MyInterface, MyImpl>::value )); 117 #if (!EIGEN_COMP_GNUC_STRICT) || (EIGEN_GNUC_AT_LEAST(4,8)) 118 // GCC prior to 4.8 fails to compile this test: 119 // error: cannot allocate an object of abstract type 'MyInterface' 120 // In other word, it does not obey SFINAE. 121 // Nevertheless, we don't really care about supporting abstract type as scalar type! 122 STATIC_CHECK(( !internal::is_convertible<MyImpl, MyInterface>::value )); 123 #endif 124 STATIC_CHECK(( internal::is_convertible<MyImpl, const MyInterface&>::value )); 125 126 #endif 127 128 { 129 int i = 0; 130 VERIFY(( check_is_convertible(fix<3>(), i) )); 131 VERIFY((!check_is_convertible(i, fix<DynamicIndex>()) )); 132 } 133 134 135 VERIFY(( internal::has_ReturnType<FooReturnType>::value )); 136 VERIFY(( internal::has_ReturnType<ScalarBinaryOpTraits<int,int> >::value )); 137 VERIFY(( !internal::has_ReturnType<MatrixXf>::value )); 138 VERIFY(( !internal::has_ReturnType<int>::value )); 139 140 VERIFY(internal::meta_sqrt<1>::ret == 1); 141 #define VERIFY_META_SQRT(X) VERIFY(internal::meta_sqrt<X>::ret == int(std::sqrt(double(X)))) 142 VERIFY_META_SQRT(2); 143 VERIFY_META_SQRT(3); 144 VERIFY_META_SQRT(4); 145 VERIFY_META_SQRT(5); 146 VERIFY_META_SQRT(6); 147 VERIFY_META_SQRT(8); 148 VERIFY_META_SQRT(9); 149 VERIFY_META_SQRT(15); 150 VERIFY_META_SQRT(16); 151 VERIFY_META_SQRT(17); 152 VERIFY_META_SQRT(255); 153 VERIFY_META_SQRT(256); 154 VERIFY_META_SQRT(257); 155 VERIFY_META_SQRT(1023); 156 VERIFY_META_SQRT(1024); 157 VERIFY_META_SQRT(1025); 158 }