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- // Boost.GIL (Generic Image Library)
- //
- // Copyright (c) 2015, Oracle and/or its affiliates.
- // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
- //
- // Licensed under the Boost Software License version 1.0.
- // http://www.boost.org/users/license.html
- //
- // Source: Boost.Geometry (aka GGL, Generic Geometry Library)
- // Modifications: adapted for Boost.GIL
- // - Rename namespace boost::geometry to boost::gil
- // - Rename define BOOST_GEOMETRY_TEST_DEBUG to BOOST_GIL_TEST_DEBUG
- // - Remove use of macro BOOST_GEOMETRY_CONDITION
- // - Remove support for boost::multiprecision types
- // - Remove support for 128-bit integer types
- // - Update and sort includes
- // - Add explicit conversions to avoid warnings due to implicit integral promotions
- //
- // Uncomment to enable debugging output
- //#define BOOST_GIL_TEST_DEBUG 1
- #include <boost/gil/promote_integral.hpp>
- #include <algorithm>
- #include <climits>
- #include <cstddef>
- #ifdef BOOST_GIL_TEST_DEBUG
- #include <iostream>
- #endif
- #include <limits>
- #include <string>
- #ifndef BOOST_TEST_MODULE
- #define BOOST_TEST_MODULE test_promote_integral
- #endif
- #include "unit_test.hpp"
- namespace bg = boost::gil;
- template
- <
- typename T,
- bool Signed = std::is_fundamental<T>::value && !std::is_unsigned<T>::type::value
- >
- struct absolute_value
- {
- static inline T apply(T const& t)
- {
- return static_cast<T>(t < 0 ? -t : t);
- }
- };
- template <typename T>
- struct absolute_value<T, false>
- {
- static inline T apply(T const& t)
- {
- return t;
- }
- };
- template
- <
- typename Integral,
- typename Promoted,
- bool Signed = !std::is_unsigned<Promoted>::value
- >
- struct test_max_values
- {
- static inline void apply()
- {
- // Use >= where value is guaranteed to never be greater than comparator
- // but to avoid warning: comparing floating point with == is unsafe.
- Promoted min_value = (std::numeric_limits<Integral>::min)();
- // Explicit casts to avoid warning: conversion to short int from int may alter its value
- min_value = static_cast<Promoted>(min_value * min_value);
- BOOST_CHECK(absolute_value<Promoted>::apply(min_value) >= min_value);
- BOOST_CHECK(absolute_value<Promoted>::apply(min_value) <= min_value);
- Promoted max_value = (std::numeric_limits<Integral>::max)();
- max_value = static_cast<Promoted>(max_value * max_value);
- BOOST_CHECK(absolute_value<Promoted>::apply(max_value) >= max_value);
- BOOST_CHECK(absolute_value<Promoted>::apply(max_value) <= max_value);
- #ifdef BOOST_GIL_TEST_DEBUG
- std::cout << "integral min_value^2: " << min_value << std::endl;
- std::cout << "promoted max_value: "
- << (std::numeric_limits<Promoted>::max)() << std::endl;
- #endif
- }
- };
- template <typename Integral, typename Promoted>
- struct test_max_values<Integral, Promoted, false>
- {
- static inline void apply()
- {
- Promoted max_value = (std::numeric_limits<Integral>::max)();
- Promoted max_value_sqr = static_cast<Promoted>(max_value * max_value);
- BOOST_CHECK(max_value_sqr < (std::numeric_limits<Promoted>::max)()
- &&
- max_value_sqr > max_value);
- #ifdef BOOST_GIL_TEST_DEBUG
- std::cout << "integral max_value^2: " << max_value_sqr << std::endl;
- std::cout << "promoted max_value: "
- << (std::numeric_limits<Promoted>::max)() << std::endl;
- #endif
- }
- };
- // helper function that returns the bit size of a type
- template
- <
- typename T,
- bool IsFundamental = std::is_fundamental<T>::value
- >
- struct bit_size_impl : std::integral_constant<std::size_t, 0>
- {};
- template <typename T>
- struct bit_size_impl<T, true> : bg::detail::promote_integral::bit_size<T>::type
- {};
- template <typename T>
- std::size_t bit_size()
- {
- return bit_size_impl<T>::value;
- }
- template <bool PromoteUnsignedToUnsigned>
- struct test_promote_integral
- {
- template <typename Type, typename ExpectedPromotedType>
- static inline void apply(std::string const& case_id)
- {
- using promoted_integral_type = typename bg::promote_integral
- <
- Type, PromoteUnsignedToUnsigned
- >::type;
- bool const same_types = std::is_same
- <
- promoted_integral_type, ExpectedPromotedType
- >::value;
- BOOST_CHECK_MESSAGE(same_types,
- "case ID: " << case_id
- << "input type: " << typeid(Type).name()
- << "; detected: "
- << typeid(promoted_integral_type).name()
- << "; expected: "
- << typeid(ExpectedPromotedType).name());
- if (!std::is_same<Type, promoted_integral_type>::value)
- {
- test_max_values<Type, promoted_integral_type>::apply();
- }
- #ifdef BOOST_GIL_TEST_DEBUG
- std::cout << "case ID: " << case_id << std::endl
- << "type : " << typeid(Type).name()
- << ", sizeof (bits): " << bit_size<Type>()
- << ", min value: "
- << (std::numeric_limits<Type>::min)()
- << ", max value: "
- << (std::numeric_limits<Type>::max)()
- << std::endl;
- std::cout << "detected promoted type : "
- << typeid(promoted_integral_type).name()
- << ", sizeof (bits): " << bit_size<promoted_integral_type>()
- << ", min value: "
- << (std::numeric_limits<promoted_integral_type>::min)()
- << ", max value: "
- << (std::numeric_limits<promoted_integral_type>::max)()
- << std::endl;
- std::cout << "expected promoted type : "
- << typeid(ExpectedPromotedType).name()
- << ", sizeof (bits): " << bit_size<ExpectedPromotedType>()
- << ", min value: "
- << (std::numeric_limits<ExpectedPromotedType>::min)()
- << ", max value: "
- << (std::numeric_limits<ExpectedPromotedType>::max)()
- << std::endl;
- std::cout << std::endl;
- #endif
- }
- };
- template
- <
- typename T,
- bool PromoteUnsignedToUnsigned = false,
- bool IsSigned = !std::is_unsigned<T>::value
- >
- struct test_promotion
- {
- static inline void apply(std::string case_id)
- {
- #ifdef BOOST_GIL_TEST_DEBUG
- std::cout << "*** "
- << (IsSigned ? "signed" : "unsigned")
- << " -> signed ***" << std::endl;
- #endif
- using tester = test_promote_integral<PromoteUnsignedToUnsigned>;
- case_id += (PromoteUnsignedToUnsigned ? "-t" : "-f");
- std::size_t min_size = 2 * bit_size<T>() - 1;
- if (!IsSigned)
- {
- min_size += 2;
- }
- #ifdef BOOST_GIL_TEST_DEBUG
- std::cout << "min size: " << min_size << std::endl;
- #endif
- if (bit_size<short>() >= min_size)
- {
- tester::template apply<T, short>(case_id);
- }
- else if (bit_size<int>() >= min_size)
- {
- tester::template apply<T, int>(case_id);
- }
- else if (bit_size<long>() >= min_size)
- {
- tester::template apply<T, long>(case_id);
- }
- #if defined(BOOST_HAS_LONG_LONG)
- else if (bit_size<boost::long_long_type>() >= min_size)
- {
- tester::template apply<T, boost::long_long_type>(case_id);
- }
- #endif
- else
- {
- tester::template apply<T, T>(case_id);
- }
- }
- };
- template <typename T>
- struct test_promotion<T, true, false>
- {
- static inline void apply(std::string case_id)
- {
- #ifdef BOOST_GIL_TEST_DEBUG
- std::cout << "*** unsigned -> unsigned ***" << std::endl;
- #endif
- case_id += "-t";
- using tester = test_promote_integral<true>;
- std::size_t min_size = 2 * bit_size<T>();
- #ifdef BOOST_GIL_TEST_DEBUG
- std::cout << "min size: " << min_size << std::endl;
- #endif
- if (bit_size<unsigned short>() >= min_size)
- {
- tester::apply<T, unsigned short>(case_id);
- }
- else if (bit_size<unsigned int>() >= min_size)
- {
- tester::apply<T, unsigned int>(case_id);
- }
- else if (bit_size<unsigned long>() >= min_size)
- {
- tester::apply<T, unsigned long>(case_id);
- }
- else if (bit_size<std::size_t>() >= min_size)
- {
- tester::apply<T, std::size_t>(case_id);
- }
- #if defined(BOOST_HAS_LONG_LONG)
- else if (bit_size<boost::ulong_long_type>() >= min_size)
- {
- tester::template apply<T, boost::ulong_long_type>(case_id);
- }
- #endif
- else
- {
- tester::apply<T, T>(case_id);
- }
- }
- };
- BOOST_AUTO_TEST_CASE( test_char )
- {
- test_promotion<char>::apply("char");
- test_promotion<char, true>::apply("char");
- test_promotion<signed char>::apply("schar");
- test_promotion<signed char, true>::apply("schar");
- test_promotion<unsigned char>::apply("uchar");
- test_promotion<unsigned char, true>::apply("uchar");
- }
- BOOST_AUTO_TEST_CASE( test_short )
- {
- test_promotion<short>::apply("short");
- test_promotion<short, true>::apply("short");
- test_promotion<unsigned short>::apply("ushort");
- test_promotion<unsigned short, true>::apply("ushort");
- }
- BOOST_AUTO_TEST_CASE( test_int )
- {
- test_promotion<int>::apply("int");
- test_promotion<int, true>::apply("int");
- test_promotion<unsigned int>::apply("uint");
- test_promotion<unsigned int, true>::apply("uint");
- }
- BOOST_AUTO_TEST_CASE( test_long )
- {
- test_promotion<long>::apply("long");
- test_promotion<long, true>::apply("long");
- test_promotion<unsigned long>::apply("ulong");
- test_promotion<unsigned long, true>::apply("ulong");
- }
- BOOST_AUTO_TEST_CASE( test_std_size_t )
- {
- test_promotion<std::size_t>::apply("size_t");
- test_promotion<std::size_t, true>::apply("size_t");
- }
- #ifdef BOOST_HAS_LONG_LONG
- BOOST_AUTO_TEST_CASE( test_long_long )
- {
- test_promotion<boost::long_long_type>::apply("long long");
- test_promotion<boost::long_long_type, true>::apply("long long");
- test_promotion<boost::ulong_long_type>::apply("ulong long");
- test_promotion<boost::ulong_long_type, true>::apply("ulong long");
- }
- #endif
- BOOST_AUTO_TEST_CASE( test_floating_point )
- {
- using tester1 = test_promote_integral<true>;
- using tester2 = test_promote_integral<false>;
- // for floating-point types we do not do any promotion
- tester1::apply<float, float>("fp-f");
- tester1::apply<double, double>("fp-d");
- tester1::apply<long double, long double>("fp-ld");
- tester2::apply<float, float>("fp-f");
- tester2::apply<double, double>("fp-d");
- tester2::apply<long double, long double>("fp-ld");
- }
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