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cgal/Algebraic_foundations/include/CGAL/Test/_test_real_embeddable.h

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// Copyright (c) 2006-2008 Max-Planck-Institute Saarbruecken (Germany).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL$
// $Id$
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Lutz Kettner <kettner@mpi-inf.mpg.de>
// Michael Hemmer <hemmer@mpi-inf.mpg.de>
//
// ============================================================================
// \brief provides test functions for the \c RealEmbeddable concept of
// number types.
#include <cstddef>
#include <CGAL/assertions.h>
#include <boost/type_traits.hpp>
#include <cassert>
#include <CGAL/tags.h>
//#include <CGAL/Algebraic_structure_traits.h>
#include <CGAL/Real_embeddable_traits.h>
#include <CGAL/Test/_test_algebraic_structure.h>
#define CGAL_SNAP_RET_FUNCTORS(RET) \
typedef typename RET::Abs Abs; \
typedef typename RET::Sgn Sgn; \
typedef typename RET::Is_finite Is_finite; \
typedef typename RET::Is_positive Is_positive; \
typedef typename RET::Is_negative Is_negative; \
typedef typename RET::Is_zero Is_zero; \
typedef typename RET::Compare Compare; \
typedef typename RET::To_double To_double; \
typedef typename RET::To_interval To_interval;
#ifndef CGAL_TEST_REAL_EMBEDDABLE_H
#define CGAL_TEST_REAL_EMBEDDABLE_H
namespace CGAL {
template<class Type, class ToDouble>
class Test_to_double {
public:
void operator() (const ToDouble& to_double) {
typedef typename ToDouble::argument_type Argument_type;
typedef typename ToDouble::result_type Result_type;
static_assert(( ::std::is_same<Type, Argument_type>::value));
CGAL_USE_TYPE(Argument_type);
static_assert(( ::std::is_same<double, Result_type>::value));
CGAL_USE_TYPE(Result_type);
assert(42.0 == to_double(Type(42)));
}
};
template<class Type>
class Test_to_double<Type, CGAL::Null_tag> {
public:
void operator() (CGAL::Null_functor) {
CGAL_error_msg("To_double functor not implemented");
}
};
template<class Type, class To_interval>
class Test_to_interval {
public:
void operator() (const To_interval& to_interval) {
typedef typename To_interval::argument_type Argument_type;
typedef typename To_interval::result_type Result_type;
typedef std::pair<double,double> Interval_type;
static_assert(( ::std::is_same<Type, Argument_type>::value));
CGAL_USE_TYPE(Argument_type);
static_assert(( ::std::is_same<Interval_type, Result_type>::value));
CGAL_USE_TYPE(Result_type); CGAL_USE_TYPE(Interval_type);
// assert(NiX::in(42.0,to_Interval(Type(42))));
// Instead of 'NiX::in':
assert( 42.0 >= to_interval( Type(42) ).first );
assert( 42.0 <= to_interval( Type(42) ).second );
assert(to_interval(Type(42)).first > 41.99);
assert(to_interval(Type(42)).second < 42.01);
// test negative numbers as well to catch obvious sign
// errors
assert( -42.0 >= to_interval( -Type(42) ).first );
assert( -42.0 <= to_interval( -Type(42) ).second );
assert(to_interval(-Type(42)).first < -41.99);
assert(to_interval(-Type(42)).second > -42.01);
/*
Type notdouble = ipower(2,60);
notdouble = notdouble + Type(1);
Interval test = to_Interval(notdouble);
double lower = ipower(2.0,60);
double upper = ipower(2.0,53);
upper++;
upper *= ipower(2.0,7);
std::cout << lower << "," << upper << std::endl;
std::cout << test.lower() << "," << test.upper() << std::endl;
assert( (in(lower,test) == true) && (in(upper,test) == true) );
*/
}
};
template< class Type >
class Test_to_interval< Type, CGAL::Null_tag> {
public:
void operator() (CGAL::Null_functor) {
CGAL_error_msg( "To_Interval not implemented");
// ok, nothing to test
}
};
// Several libraries do not want to enforce the use of std::min/max
// for the case that there is a special function for min/max
// However, this may be a problem for template CGAL::min/max in case NT is a
// CGAL type. These types have to overload CGAL::min/max.
template<typename NT>
void test_min_max(){
using std:: min BOOST_PREVENT_MACRO_SUBSTITUTION ;
using std:: max BOOST_PREVENT_MACRO_SUBSTITUTION ;
NT x(1),y(2);
assert(min BOOST_PREVENT_MACRO_SUBSTITUTION (x,y)==NT(1));
assert(max BOOST_PREVENT_MACRO_SUBSTITUTION (x,y)==NT(2));
}
//! tests if \c Type is a model for the \c RealComparable concept
//! and terminates the program with an error message if not.
template <class Type>
void test_real_embeddable() {
test_min_max<Type>();
typedef CGAL::Real_embeddable_traits<Type> RET;
CGAL_SNAP_RET_FUNCTORS(RET);
typedef typename RET::Is_real_embeddable Is_real_embeddable;
using CGAL::Tag_true;
static_assert(( ::std::is_same< Is_real_embeddable, Tag_true>::value));
CGAL_USE_TYPE(Is_real_embeddable);
typedef typename RET::Boolean Boolean;
typedef typename RET::Sign Sign;
typedef typename RET::Comparison_result Comparison_result;
check_result_type(Is_finite() ,Boolean());
check_result_type(Is_positive(),Boolean());
check_result_type(Is_negative(),Boolean());
check_result_type(Is_zero(),Boolean());
check_result_type(Sgn(),Sign());
check_result_type(Compare(),Comparison_result());
// test implicit interoperability with base type and proper default
assert(Boolean() == bool());
assert(Sign() == CGAL::Sign());
assert(Comparison_result() == CGAL::Comparison_result());
typename RET::Compare compare;
const Sgn sign = Sgn();
const Abs abs=Abs();
const Is_finite is_finite=Is_finite();
const Is_positive is_positive=Is_positive();
const Is_negative is_negative=Is_negative();
const Is_zero is_zero=Is_zero();
Type a(-2);
Type b(1);
Type c(0);
assert( is_finite(a) );
assert( is_finite(b) );
assert( is_finite(c) );
assert( !is_positive(a) );
assert( is_positive(b) );
assert( !is_positive(c) );
assert( is_negative(a) );
assert( !is_negative(b) );
assert( !is_negative(c) );
assert( !is_zero(a) );
assert( !is_zero(b) );
assert( is_zero(c) );
assert( a < b);
assert( b > a);
assert( a <= b);
assert( b >= a);
assert( a <= a);
assert( a >= a);
assert( compare(a,b) == CGAL::SMALLER);
assert( compare(b,a) == CGAL::LARGER);
assert( compare(a,a) == CGAL::EQUAL);
assert( sign(a) == CGAL::NEGATIVE);
assert( sign(b) == CGAL::POSITIVE);
assert( sign(c) == CGAL::ZERO);
assert( sign(a) < sign(b));
assert( sign(b) > sign(a));
assert( sign(a) <= sign(b));
assert( sign(b) >= sign(a));
assert( sign(a) <= sign(a));
assert( sign(a) >= sign(a));
assert( sign(c) < sign(b));
assert( sign(b) > sign(c));
assert( sign(c) <= sign(b));
assert( sign(b) >= sign(c));
assert( sign(c) <= sign(c));
assert( sign(c) >= sign(c));
assert( sign(a) < sign(c));
assert( sign(c) > sign(a));
assert( sign(a) <= sign(c));
assert( sign(c) >= sign(a));
assert( abs(a) == Type(2));
assert( abs(b) == Type(1));
assert( abs(c) == Type(0));
// To_double --------------------------------------------------------------
const To_double to_double = To_double();
(void)to_double;
Test_to_double<Type, To_double> ttd;
ttd(to_double);
// To_Interval ------------------------------------------------------------
const To_interval to_interval = To_interval();
(void)to_interval;
Test_to_interval<Type, To_interval> tti;
tti(to_interval);
// additional functions
assert( CGAL_NTS is_finite( Type(1) ) );
assert( CGAL_NTS sign(Type(-5))==CGAL::NEGATIVE);
assert( CGAL_NTS abs(Type(-5))==Type(5));
// assert(NiX::in(5.0,NiX::to_interval(Type(5))));
assert( CGAL_NTS compare(Type(-5),Type(6))==CGAL::SMALLER);
assert( CGAL_NTS is_positive(Type(23)) );
assert( CGAL_NTS is_negative(Type(-23)) );
assert( CGAL_NTS is_zero( Type(0) ) );
assert( !CGAL_NTS is_zero( Type(23) ) );
}
//! tests if \c Type says it is not a model for the \c RealComparable
//! concept and terminates the program with an error message if it
//! actually is.
template <class Type>
void test_not_real_embeddable() {
typedef CGAL::Real_embeddable_traits<Type> RET;
typedef typename RET::Is_real_embeddable Is_real_embeddable;
using CGAL::Tag_false;
static_assert(( ::std::is_same< Is_real_embeddable, Tag_false>::value));
CGAL_USE_TYPE(Is_real_embeddable);
}
//template <class Type, class CeilLog2Abs>
//void test_rounded_log2_abs(Type zero, CGAL::Null_functor, CeilLog2Abs) {
// typedef CGAL::Null_functor Null_functor;
// static_assert(( ::std::is_same< CeilLog2Abs, Null_functor>::value));
//}
//
//template <class Type, class FloorLog2Abs, class CeilLog2Abs>
//void test_rounded_log2_abs(Type zero, FloorLog2Abs fl_log, CeilLog2Abs cl_log) {
// typedef CGAL::Null_functor Null_functor;
// static_assert((!::std::is_same< CeilLog2Abs, Null_functor>::value));
//
// assert( fl_log(Type( 7)) == 2 );
// assert( cl_log(Type( 7)) == 3 );
// assert( fl_log(Type( 8)) == 3 );
// assert( cl_log(Type( 8)) == 3 );
// assert( fl_log(Type(-9)) == 3 );
// assert( cl_log(Type(-9)) == 4 );
//
// assert( NiX::floor_log2_abs(Type( 64)) == 6 );
// assert( NiX::ceil_log2_abs( Type( 64)) == 6 );
// assert( NiX::floor_log2_abs(Type(-126)) == 6 );
// assert( NiX::ceil_log2_abs( Type(-126)) == 7 );
//}
//
//
////! tests that \c Floor_log2_abs and \c Ceil_log2_abs are
////! \c both CGAL::Null_functor or both working properly
////! (This is independent of the \c RealComparable concept)
//template <class Type>
//void test_rounded_log2_abs() {
//
// typedef typename NiX::Real_embeddable_traits<Type>::Floor_log2_abs F;
// typedef typename NiX::Real_embeddable_traits<Type>::Ceil_log2_abs C;
// test_rounded_log2_abs(Type(0), F(), C());
//}
} //namespace CGAL
#endif // CGAL_TEST_REAL_COMPARABLE_H
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