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7f18293526
make_literal is losing some precision when making literal floating point values because it uses digits10, but that only gives us the number of decimal digits that will survive a decimal->native>decimal conversion; what we are doing is a native->decimal->native conversion, which requires the user of ::max_digits10 (which is 2 (double) or 3 (float) larger than ::digits10). max_digits10 is a c++11 feature, however, so this commit uses digits10 + 3 when the c++11 numeric_limits isn't available.
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
//---------------------------------------------------------------------------//
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// Copyright (c) 2016 Jason Rhinelander <jason@imaginary.ca>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#define BOOST_TEST_MODULE TestLiteralConversion
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#include <boost/test/unit_test.hpp>
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#include <string>
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#include <sstream>
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#include <vector>
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#include <boost/compute/detail/literal.hpp>
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BOOST_AUTO_TEST_CASE(literal_conversion_float)
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{
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std::vector<float> values, roundtrip;
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values.push_back(1.2345679f);
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values.push_back(1.2345680f);
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values.push_back(1.2345681f);
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for (int i = 0; i < values.size(); i++) {
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std::istringstream iss(boost::compute::detail::make_literal(values[i]));
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float x;
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BOOST_CHECK(iss >> x);
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BOOST_CHECK_EQUAL(char(iss.get()), 'f');
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// Make sure we're at the end:
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iss.peek();
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BOOST_CHECK(iss.eof());
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roundtrip.push_back(x);
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}
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BOOST_CHECK_EQUAL(values[0], roundtrip[0]);
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BOOST_CHECK_EQUAL(values[1], roundtrip[1]);
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BOOST_CHECK_EQUAL(values[2], roundtrip[2]);
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}
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BOOST_AUTO_TEST_CASE(literal_conversion_double)
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{
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std::vector<double> values, roundtrip;
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values.push_back(1.2345678901234567);
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values.push_back(1.2345678901234569);
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values.push_back(1.2345678901234571);
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for (int i = 0; i < values.size(); i++) {
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std::istringstream iss(boost::compute::detail::make_literal(values[i]));
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double x;
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BOOST_CHECK(iss >> x);
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// Make sure we're at the end:
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iss.peek();
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BOOST_CHECK(iss.eof());
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roundtrip.push_back(x);
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}
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BOOST_CHECK_EQUAL(values[0], roundtrip[0]);
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BOOST_CHECK_EQUAL(values[1], roundtrip[1]);
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BOOST_CHECK_EQUAL(values[2], roundtrip[2]);
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}
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