id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
11328,Regression in multiprecision::cpp_int comparison,chfast@…,John Maddock,"The comparison of 2 values of different cpp_int types in the following program produces incorrect result:

{{{#!cpp
#include <boost/version.hpp>
#include <boost/multiprecision/cpp_int.hpp>
#include <iostream>

using bigint = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<>>;
using u128 =  boost::multiprecision::number<boost::multiprecision::cpp_int_backend<128, 128, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;

int main()
{
	u128 a = 14;
	bigint b = bigint(""115792089237316195423570985008687907853269984665640564039457584007913129639948"");
	auto correct = a < b;

	std::cout << ""Boost "" << BOOST_VERSION << "" : "" << correct << std::endl;
	return !correct;
}

}}}

Versions affected: 1.58+.",Bugs,closed,Boost 1.59.0,multiprecision,Boost 1.58.0,Regression,fixed,,