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// Copyright John Maddock 2015.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifdef _MSC_VER
# define _SCL_SECURE_NO_WARNINGS
#endif
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/algorithm/string/case_conv.hpp>
#include <boost/random/mersenne_twister.hpp>
#include <boost/random/uniform_int.hpp>
#include "test.hpp"
#include <iostream>
#include <iomanip>
#ifdef BOOST_MSVC
#pragma warning(disable:4127)
#endif
template <class T>
struct unchecked_type { typedef T type; };
template <unsigned MinBits, unsigned MaxBits, boost::multiprecision::cpp_integer_type SignType, boost::multiprecision::cpp_int_check_type Checked, class Allocator, boost::multiprecision::expression_template_option ExpressionTemplates>
struct unchecked_type<boost::multiprecision::number<boost::multiprecision::cpp_int_backend<MinBits, MaxBits, SignType, Checked, Allocator>, ExpressionTemplates> >
{
typedef boost::multiprecision::number<boost::multiprecision::cpp_int_backend<MinBits, MaxBits, SignType, boost::multiprecision::unchecked, Allocator>, ExpressionTemplates> type;
};
template <class T>
T generate_random()
{
typedef typename unchecked_type<T>::type unchecked_T;
static const unsigned limbs = std::numeric_limits<T>::is_specialized && std::numeric_limits<T>::is_bounded ? std::numeric_limits<T>::digits / std::numeric_limits<unsigned>::digits + 3 : 20;
static boost::random::uniform_int_distribution<unsigned> ui(0, limbs);
static boost::random::mt19937 gen;
unchecked_T val = gen();
unsigned lim = ui(gen);
for(unsigned i = 0; i < lim; ++i)
{
val *= (gen.max)();
val += gen();
}
return val;
}
template <class T>
void test_round_trip_neg(T val, const boost::mpl::true_&)
{
// Try some negative values:
std::vector<unsigned char> cv;
T newval;
val = -val;
export_bits(val, std::back_inserter(cv), 8, false);
import_bits(newval, cv.begin(), cv.end(), 8, false);
BOOST_CHECK_EQUAL(-val, newval);
}
template <class T>
void test_round_trip_neg(const T&, const boost::mpl::false_&)
{
}
template <class T>
void test_round_trip()
{
std::cout << std::hex;
std::cerr << std::hex;
for(unsigned i = 0; i < 1000; ++i)
{
T val = generate_random<T>();
std::vector<unsigned char> cv;
export_bits(val, std::back_inserter(cv), 8);
T newval;
import_bits(newval, cv.begin(), cv.end());
BOOST_CHECK_EQUAL(val, newval);
// Should get the same value if we reverse the bytes:
std::reverse(cv.begin(), cv.end());
newval = 0;
import_bits(newval, cv.begin(), cv.end(), 8, false);
BOOST_CHECK_EQUAL(val, newval);
// Also try importing via pointers as these may memcpy:
newval = 0;
import_bits(newval, &cv[0], &cv[0] + cv.size(), 8, false);
BOOST_CHECK_EQUAL(val, newval);
cv.clear();
export_bits(val, std::back_inserter(cv), 8, false);
import_bits(newval, cv.begin(), cv.end(), 8, false);
BOOST_CHECK_EQUAL(val, newval);
std::reverse(cv.begin(), cv.end());
newval = 0;
import_bits(newval, cv.begin(), cv.end(), 8, true);
BOOST_CHECK_EQUAL(val, newval);
std::vector<boost::uintmax_t> bv;
export_bits(val, std::back_inserter(bv), std::numeric_limits<boost::uintmax_t>::digits);
import_bits(newval, bv.begin(), bv.end());
BOOST_CHECK_EQUAL(val, newval);
// Should get the same value if we reverse the values:
std::reverse(bv.begin(), bv.end());
newval = 0;
import_bits(newval, bv.begin(), bv.end(), std::numeric_limits<boost::uintmax_t>::digits, false);
BOOST_CHECK_EQUAL(val, newval);
// Also try importing via pointers as these may memcpy:
newval = 0;
import_bits(newval, &bv[0], &bv[0] + bv.size(), std::numeric_limits<boost::uintmax_t>::digits, false);
BOOST_CHECK_EQUAL(val, newval);
bv.clear();
export_bits(val, std::back_inserter(bv), std::numeric_limits<boost::uintmax_t>::digits, false);
import_bits(newval, bv.begin(), bv.end(), std::numeric_limits<boost::uintmax_t>::digits, false);
BOOST_CHECK_EQUAL(val, newval);
//
// Try with an unconventional number of bits, to model some machine with guard bits:
//
bv.clear();
export_bits(val, std::back_inserter(bv), std::numeric_limits<boost::uintmax_t>::digits - 3);
import_bits(newval, bv.begin(), bv.end(), std::numeric_limits<boost::uintmax_t>::digits - 3);
BOOST_CHECK_EQUAL(val, newval);
bv.clear();
export_bits(val, std::back_inserter(bv), std::numeric_limits<boost::uintmax_t>::digits - 3, false);
import_bits(newval, bv.begin(), bv.end(), std::numeric_limits<boost::uintmax_t>::digits - 3, false);
BOOST_CHECK_EQUAL(val, newval);
cv.clear();
export_bits(val, std::back_inserter(cv), 6);
import_bits(newval, cv.begin(), cv.end(), 6);
BOOST_CHECK_EQUAL(val, newval);
cv.clear();
export_bits(val, std::back_inserter(cv), 6, false);
import_bits(newval, cv.begin(), cv.end(), 6, false);
BOOST_CHECK_EQUAL(val, newval);
test_round_trip_neg(val, boost::mpl::bool_<std::numeric_limits<T>::is_signed>());
}
}
int main()
{
test_round_trip<boost::multiprecision::cpp_int>();
test_round_trip<boost::multiprecision::checked_int1024_t>();
test_round_trip<boost::multiprecision::checked_uint512_t >();
test_round_trip<boost::multiprecision::number<boost::multiprecision::cpp_int_backend<64, 64, boost::multiprecision::unsigned_magnitude, boost::multiprecision::checked, void> > >();
test_round_trip<boost::multiprecision::number<boost::multiprecision::cpp_int_backend<23, 23, boost::multiprecision::unsigned_magnitude, boost::multiprecision::checked, void> > >();
return boost::report_errors();
}
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