50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
///////////////////////////////////////////////////////////////
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// Copyright 2015 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 https://www.boost.org/LICENSE_1_0.txt
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#include <boost/multiprecision/cpp_bin_float.hpp>
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#include <iostream>
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#include <iomanip>
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#include <vector>
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#include <iterator>
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// Contains Quickbook snippets in comments.
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//[IE2
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/*`
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Importing or exporting cpp_bin_float is similar, but we must procede via an intermediate integer:
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*/
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/*=
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#include <boost/multiprecision/cpp_bin_float.hpp>
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#include <iostream>
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#include <iomanip>
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#include <vector>
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#include <iterator>
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*/
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int main()
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{
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using boost::multiprecision::cpp_bin_float_100;
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using boost::multiprecision::cpp_int;
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// Create a cpp_bin_float to import/export:
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cpp_bin_float_100 f(1);
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f /= 3;
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// export into 8-bit unsigned values, most significant bit first:
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std::vector<unsigned char> v;
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export_bits(cpp_int(f.backend().bits()), std::back_inserter(v), 8);
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// Grab the exponent as well:
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int e = f.backend().exponent();
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// Import back again, and check for equality, we have to procede via
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// an intermediate integer:
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cpp_int i;
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import_bits(i, v.begin(), v.end());
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cpp_bin_float_100 g(i);
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g.backend().exponent() = e;
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BOOST_ASSERT(f == g);
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}
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//]
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