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