Ticket #8711: boost_multiprecision_error_demo.cpp

//
//  boost_multiprecision_error_demo.cpp
//
//  Created by Jan Bouwer on 19/6/13.


#include <cassert>
#include <cstdint>
#include <limits>
#include <boost/multiprecision/cpp_int.hpp>


template<typename T, class I>
void test_boost_multiprecision()
{
    T negMin = std::numeric_limits<T>::min();
    I test1(negMin), test2( negMin + 1 );
    --test2;

    assert( test1 == test2 ); // This fails on my platform for T = long
    assert( test1 != 0 );
    assert( test1 == negMin );
    assert( test2 != 0 );
    assert( test2 == negMin ); // This fails on my platform for T = long
}

int main(int argc, const char * argv[])
{
    test_boost_multiprecision<int64_t, boost::multiprecision::checked_cpp_int>(); // Fails on my platform
    test_boost_multiprecision<int32_t, boost::multiprecision::checked_cpp_int>(); // Pass
    test_boost_multiprecision<int16_t, boost::multiprecision::checked_cpp_int>(); // Pass

    test_boost_multiprecision<long, boost::multiprecision::cpp_int>(); // Fail on my platform

    // The following hold for my platform: x86_64-apple-darwin12.4.0,
    // using: Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
    // with: -std=c++11 -stdlib=libc++
    // static_assert(std::numeric_limits<long long>::min() == std::numeric_limits<int64_t>::min(), "Ok");
    // static_assert(std::numeric_limits<long>::min() == std::numeric_limits<int64_t>::min(), "Ok");
}