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Boost-Commit : |
Subject: [Boost-commit] svn:boost r85959 - sandbox/multiprecision.cpp_bin_float/libs/multiprecision/test
From: pbristow_at_[hidden]
Date: 2013-09-26 09:27:41
Author: pbristow
Date: 2013-09-26 09:27:41 EDT (Thu, 26 Sep 2013)
New Revision: 85959
URL: http://svn.boost.org/trac/boost/changeset/85959
Log:
Removed test_cpp_bin_float_io_2 because it is untestable.
Deleted:
sandbox/multiprecision.cpp_bin_float/libs/multiprecision/test/test_cpp_bin_float_io_2.cpp
Deleted: sandbox/multiprecision.cpp_bin_float/libs/multiprecision/test/test_cpp_bin_float_io_2.cpp
==============================================================================
--- sandbox/multiprecision.cpp_bin_float/libs/multiprecision/test/test_cpp_bin_float_io_2.cpp 2013-09-26 09:27:41 EDT (Thu, 26 Sep 2013) (r85958)
+++ /dev/null 00:00:00 1970 (deleted)
@@ -1,181 +0,0 @@
-// Copyright John Maddock 2013.
-// Copyright Paul A. Bristow 2013.
-
-// Use, modification and distribution are subject to the
-// Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt
-// or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-#if defined(_MSC_VER) || defined(__MINGW32__)
-# define _SCL_SECURE_NO_WARNINGS
-//# pragma warning (disable : 4389)
-# pragma warning (disable : 4512) // assignment operator could not be generated.
-# pragma warning(disable:4127)
-#define BOOST_MP_MIN_EXPONENT_DIGITS 3
-// else use BOOST_MP_MIN_EXPONENT_DIGITS default = 2
-#endif
-
-#include <boost/multiprecision/cpp_bin_float.hpp>
-#include <boost/multiprecision/cpp_dec_float.hpp>
-
-#include <boost/random/mersenne_twister.hpp>
-#include <boost/random/uniform_int.hpp>
-#include <boost/array.hpp>
-
-#include <iostream>
-#include <iomanip>
-
-#include "test.hpp" // JM version of Boost test.
-
-#ifdef BOOST_MSVC
-
-#endif
-
-void print_flags(std::ios_base::fmtflags f)
-{
- std::cout << "Formatting flags were: ";
- if(f & std::ios_base::scientific)
- std::cout << "scientific ";
- if(f & std::ios_base::fixed)
- std::cout << "fixed ";
- if(f & std::ios_base::showpoint)
- std::cout << "showpoint ";
- if(f & std::ios_base::showpos)
- std::cout << "showpos ";
- std::cout << std::endl;
-}
-
-
-union dull
-{ // Used to enable output of double in hex.
- double d;
- unsigned long long u;
-};
-
-double generate_random()
-{
- dull z;
- // Generate 52 random-ish significand bits.
- z.u = rand();
- z.u <<= 15;
- z.u += rand();
- z.u <<= 15;
- z.u += rand();
- z.u <<= 15;
- z.u += rand();
- z.u &= 0x000FFFFFFFFFFFFF; // Clear any excess significand bits.
-
- double d = rand();
- d /= static_cast<double>(0x7FE);
- d *= 0x7FE + 1;
- unsigned long long randexp = static_cast<unsigned long long>(d);
-// unsigned long long randexp = unsigned long long(((double) rand() / (double) 0x7FE) * 0x7FE + 1);
- // 11 exponent bits, range 1 to 0x7FE, for positive denormalized.
- //randexp = 0x3f2; // to test a particular exponent. 3f3,3f4, 3f5 & 3f6 are wrongly read, covering a tenfold range.
- randexp <<= 52; // Shift up over 52 significand bits.
- randexp &= 0x7FE0000000000000; // Normalized doubles only.
- // cout << hex << randexp << endl; // look random-ish.
-
- z.u += randexp;
- return z.d;
-}// double generate_random()
-
-template <class T>
-T generate_random()
-{
- typedef typename T::backend_type::exponent_type e_type;
- static boost::random::mt19937 gen;
- T val = gen();
- T prev_val = -1;
- while(val != prev_val)
- {
- val *= (gen.max)();
- prev_val = val;
- val += gen();
- }
- e_type e;
- val = frexp(val, &e);
-
- static boost::random::uniform_int_distribution<e_type> ui(0, std::numeric_limits<T>::max_exponent);
- return ldexp(val, ui(gen));
-}
-
-template <class T>
-void test()
-{ //! Output using all combinations of format flags and check is same as using double.
-
- typedef T mp_t;
- boost::array<std::ios_base::fmtflags, 9> formats =
- {{
- std::ios_base::fmtflags(0), // default fmtflags.
- std::ios_base::showpoint,
- std::ios_base::showpos,
- std::ios_base::scientific,
- std::ios_base::scientific|std::ios_base::showpos,
- std::ios_base::scientific|std::ios_base::showpoint,
- std::ios_base::fixed,
- std::ios_base::fixed|std::ios_base::showpoint,
- std::ios_base::fixed|std::ios_base::showpos
- }};
-
- for(unsigned j = 0; j < 1000; ++j)
- {
- double num = generate_random();
- double val = static_cast<double>(num);
- if((fabs(val) > 1) && (fabs(val) < 1e8))
- {
- unsigned col = 0;
- for(unsigned precision = 1; precision < 14; ++precision)
- {
- for(unsigned i = 0; i < formats.size(); ++i, ++col)
- {
- std::stringstream ss;
- ss.precision(precision);
- ss.flags(formats[i]);
- ss << mp_t(val);
-
- // Expect to output same string as using double.
- std::stringstream sse;
- sse.precision(precision);
- sse.flags(formats[i]);
- sse << static_cast<double>(val);
- std::string expect = sse.str();
-
- if(ss.str() != expect)
- {
- print_flags(formats[i]);
- std::cout << "Precision: " << precision << std::endl;
- std::cout << std::scientific << std::setprecision(17) << std::showpoint << "Test val: " << val << std::endl;
- // for scientific, precision is 17 digits *after* decimal point.
- std::cout << "Got: " << ss.str() << std::endl;
- std::cout << "Expected: " << expect << std::endl;
- ++boost::detail::test_errors();
- //mp_t(val).str(precision, formats[i]); // for debugging
-
- boost::multiprecision::cpp_dec_float_50 f50(val);
- std::cout << "True non-rounded result = " << f50.str(50, formats[i]) << std::endl;
-
- std::stringstream ss3;
- ss3 << expect;
- double v2;
- ss3 >> v2;
- if(val != v2)
- {
- std::cout << "Double value did not round trip!!\n";
- }
-
- }
- }
- }
- }
- }
-} // template <class T> void test()
-
-int main()
-{
- using namespace boost::multiprecision;
-
- test<number<cpp_bin_float<53> > >();
-
- return boost::report_errors();
-} // int main()
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