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eigen/test/meta.cpp
Antonio Sanchez 41d5d5334b Initialize primitives to fix -Wuninitialized-const-reference. 
The `meta` test generates warnings with the latest version of clang due
to passing uninitialized variables as const reference arguments.
```
test/meta.cpp:102:45: error: variable 'f' is uninitialized when passed as a const reference argument here [-Werror,-Wuninitialized-const-reference]
    VERIFY(( check_is_convertible(a.dot(b), f) ));
```
We don't actually use the variables, but initializing them eliminates the
new warning.

Fixes #2067.
2020-11-18 20:23:20 +00:00

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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// 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/.
#include "main.h"
template<typename From, typename To>
bool check_is_convertible(const From&, const To&)
{
return internal::is_convertible<From,To>::value;
}
struct FooReturnType {
typedef int ReturnType;
};
struct MyInterface {
virtual void func() = 0;
virtual ~MyInterface() {}
};
struct MyImpl : public MyInterface {
void func() {}
};
EIGEN_DECLARE_TEST(meta)
{
VERIFY((internal::conditional<(3<4),internal::true_type, internal::false_type>::type::value));
VERIFY(( internal::is_same<float,float>::value));
VERIFY((!internal::is_same<float,double>::value));
VERIFY((!internal::is_same<float,float&>::value));
VERIFY((!internal::is_same<float,const float&>::value));
VERIFY(( internal::is_same<float,internal::remove_all<const float&>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_all<const float*>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_all<const float*&>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_all<float**>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_all<float**&>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_all<float* const *&>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_all<float* const>::type >::value));
// test add_const
VERIFY(( internal::is_same< internal::add_const<float>::type, const float >::value));
VERIFY(( internal::is_same< internal::add_const<float*>::type, float* const>::value));
VERIFY(( internal::is_same< internal::add_const<float const*>::type, float const* const>::value));
VERIFY(( internal::is_same< internal::add_const<float&>::type, float& >::value));
// test remove_const
VERIFY(( internal::is_same< internal::remove_const<float const* const>::type, float const* >::value));
VERIFY(( internal::is_same< internal::remove_const<float const*>::type, float const* >::value));
VERIFY(( internal::is_same< internal::remove_const<float* const>::type, float* >::value));
// test add_const_on_value_type
VERIFY(( internal::is_same< internal::add_const_on_value_type<float&>::type, float const& >::value));
VERIFY(( internal::is_same< internal::add_const_on_value_type<float*>::type, float const* >::value));
VERIFY(( internal::is_same< internal::add_const_on_value_type<float>::type, const float >::value));
VERIFY(( internal::is_same< internal::add_const_on_value_type<const float>::type, const float >::value));
VERIFY(( internal::is_same< internal::add_const_on_value_type<const float* const>::type, const float* const>::value));
VERIFY(( internal::is_same< internal::add_const_on_value_type<float* const>::type, const float* const>::value));
VERIFY(( internal::is_same<float,internal::remove_reference<float&>::type >::value));
VERIFY(( internal::is_same<const float,internal::remove_reference<const float&>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_pointer<float*>::type >::value));
VERIFY(( internal::is_same<const float,internal::remove_pointer<const float*>::type >::value));
VERIFY(( internal::is_same<float,internal::remove_pointer<float* const >::type >::value));
// is_convertible
STATIC_CHECK(( internal::is_convertible<float,double>::value ));
STATIC_CHECK(( internal::is_convertible<int,double>::value ));
STATIC_CHECK(( internal::is_convertible<int, short>::value ));
STATIC_CHECK(( internal::is_convertible<short, int>::value ));
STATIC_CHECK(( internal::is_convertible<double,int>::value ));
STATIC_CHECK(( internal::is_convertible<double,std::complex<double> >::value ));
STATIC_CHECK((!internal::is_convertible<std::complex<double>,double>::value ));
STATIC_CHECK(( internal::is_convertible<Array33f,Matrix3f>::value ));
STATIC_CHECK(( internal::is_convertible<Matrix3f&,Matrix3f>::value ));
STATIC_CHECK(( internal::is_convertible<Matrix3f&,Matrix3f&>::value ));
STATIC_CHECK(( internal::is_convertible<Matrix3f&,const Matrix3f&>::value ));
STATIC_CHECK(( internal::is_convertible<const Matrix3f&,Matrix3f>::value ));
STATIC_CHECK(( internal::is_convertible<const Matrix3f&,const Matrix3f&>::value ));
STATIC_CHECK((!internal::is_convertible<const Matrix3f&,Matrix3f&>::value ));
STATIC_CHECK((!internal::is_convertible<const Matrix3f,Matrix3f&>::value ));
STATIC_CHECK(!( internal::is_convertible<Matrix3f,Matrix3f&>::value ));
STATIC_CHECK(!( internal::is_convertible<int,int&>::value ));
STATIC_CHECK(( internal::is_convertible<const int,const int& >::value ));
//STATIC_CHECK((!internal::is_convertible<Matrix3f,Matrix3d>::value )); //does not even compile because the conversion is prevented by a static assertion
STATIC_CHECK((!internal::is_convertible<Array33f,int>::value ));
STATIC_CHECK((!internal::is_convertible<MatrixXf,float>::value ));
{
float f = 0.0f;
MatrixXf A, B;
VectorXf a, b;
VERIFY(( check_is_convertible(a.dot(b), f) ));
VERIFY(( check_is_convertible(a.transpose()*b, f) ));
VERIFY((!check_is_convertible(A*B, f) ));
VERIFY(( check_is_convertible(A*B, A) ));
}
#if (EIGEN_COMP_GNUC && EIGEN_COMP_GNUC <= 99) \
|| (EIGEN_COMP_CLANG && EIGEN_COMP_CLANG <= 909) \
|| (EIGEN_COMP_MSVC && EIGEN_COMP_MSVC <=1914)
// See http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1752,
// basically, a fix in the c++ standard breaks our c++98 implementation
// of is_convertible for abstract classes.
// So the following tests are expected to fail with recent compilers.
STATIC_CHECK(( !internal::is_convertible<MyInterface, MyImpl>::value ));
#if (!EIGEN_COMP_GNUC_STRICT) || (EIGEN_GNUC_AT_LEAST(4,8))
// GCC prior to 4.8 fails to compile this test:
// error: cannot allocate an object of abstract type 'MyInterface'
// In other word, it does not obey SFINAE.
// Nevertheless, we don't really care about supporting abstract type as scalar type!
STATIC_CHECK(( !internal::is_convertible<MyImpl, MyInterface>::value ));
#endif
STATIC_CHECK(( internal::is_convertible<MyImpl, const MyInterface&>::value ));
#endif
{
int i = 0;
VERIFY(( check_is_convertible(fix<3>(), i) ));
VERIFY((!check_is_convertible(i, fix<DynamicIndex>()) ));
}
VERIFY(( internal::has_ReturnType<FooReturnType>::value ));
VERIFY(( internal::has_ReturnType<ScalarBinaryOpTraits<int,int> >::value ));
VERIFY(( !internal::has_ReturnType<MatrixXf>::value ));
VERIFY(( !internal::has_ReturnType<int>::value ));
VERIFY(internal::meta_sqrt<1>::ret == 1);
#define VERIFY_META_SQRT(X) VERIFY(internal::meta_sqrt<X>::ret == int(std::sqrt(double(X))))
VERIFY_META_SQRT(2);
VERIFY_META_SQRT(3);
VERIFY_META_SQRT(4);
VERIFY_META_SQRT(5);
VERIFY_META_SQRT(6);
VERIFY_META_SQRT(8);
VERIFY_META_SQRT(9);
VERIFY_META_SQRT(15);
VERIFY_META_SQRT(16);
VERIFY_META_SQRT(17);
VERIFY_META_SQRT(255);
VERIFY_META_SQRT(256);
VERIFY_META_SQRT(257);
VERIFY_META_SQRT(1023);
VERIFY_META_SQRT(1024);
VERIFY_META_SQRT(1025);
}
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