78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 John Maddock. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/multiprecision/cpp_bin_float.hpp>
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int main()
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{
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typedef boost::multiprecision::number<boost::multiprecision::cpp_bin_float<8, boost::multiprecision::backends::digit_base_2> > quarter_float;
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quarter_float qf(256);
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unsigned int ui = qf.convert_to<unsigned int>();
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if (ui != 256)
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return 1;
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std::uintmax_t m(1), n;
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m <<= std::numeric_limits<std::uintmax_t>::digits - 1;
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qf = m;
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n = qf.convert_to<std::uintmax_t>();
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if (m != n)
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return 2;
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qf *= 2;
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n = qf.convert_to<std::uintmax_t>();
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m = (std::numeric_limits<std::uintmax_t>::max)();
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if (m != n)
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return 3;
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qf = 256;
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int si = qf.convert_to<int>();
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if (si != 256)
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return 4;
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std::intmax_t sm(1), sn;
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sm <<= std::numeric_limits<std::intmax_t>::digits - 1;
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qf = sm;
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sn = qf.convert_to<std::intmax_t>();
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if (sm != sn)
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return 5;
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qf *= 2;
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sn = qf.convert_to<std::intmax_t>();
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sm = (std::numeric_limits<std::intmax_t>::max)();
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if (sm != sn)
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return 6;
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// Again with negative numbers:
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qf = -256;
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si = qf.convert_to<int>();
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if (si != -256)
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return 7;
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sm = 1;
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sm <<= std::numeric_limits<std::intmax_t>::digits - 1;
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sm = -sm;
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qf = sm;
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sn = qf.convert_to<std::intmax_t>();
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if (sm != sn)
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return 8;
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qf *= 2;
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sn = qf.convert_to<std::intmax_t>();
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sm = (std::numeric_limits<std::intmax_t>::min)();
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if (sm != sn)
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return 9;
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// Now try conversion to cpp_int:
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qf = 256;
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boost::multiprecision::cpp_int i = qf.convert_to<boost::multiprecision::cpp_int>(), j;
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if (i != 256)
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return 10;
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qf = ldexp(qf, 126);
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i = qf.convert_to<boost::multiprecision::cpp_int>();
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j = 256;
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j <<= 126;
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if (i != j)
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return 11;
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return 0;
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}
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