mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-11-03 21:40:52 -05:00
120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
// 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)
|
|
|
|
// Copyright Paul A. Bristow 2013
|
|
// Copyright Christopher Kormanyos 2013.
|
|
// Copyright John Maddock 2013.
|
|
|
|
#ifdef _MSC_VER
|
|
# pragma warning (disable : 4512)
|
|
# pragma warning (disable : 4996)
|
|
#endif
|
|
|
|
#define BOOST_TEST_MAIN
|
|
#define BOOST_LIB_DIAGNOSTIC "on"// Show library file details.
|
|
|
|
#include <boost/test/unit_test.hpp>
|
|
#include <boost/test/floating_point_comparison.hpp> // Extra test tool for FP comparison.
|
|
|
|
#include <iostream>
|
|
#include <limits>
|
|
|
|
//[expression_template_1
|
|
|
|
#include <boost/multiprecision/cpp_dec_float.hpp>
|
|
|
|
/*`To define a 50 decimal digit type using `cpp_dec_float`,
|
|
you must pass two template parameters to `boost::multiprecision::number`.
|
|
|
|
It may be more legible to use a two-staged type definition such as this:
|
|
|
|
``
|
|
typedef boost::multiprecision::cpp_dec_float<50> mp_backend;
|
|
typedef boost::multiprecision::number<mp_backend, boost::multiprecision::et_off> cpp_dec_float_50_noet;
|
|
``
|
|
|
|
Here, we first define `mp_backend` as `cpp_dec_float` with 50 digits.
|
|
The second step passes this backend to `boost::multiprecision::number`
|
|
with `boost::multiprecision::et_off`, an enumerated type.
|
|
|
|
typedef boost::multiprecision::number<boost::multiprecision::cpp_dec_float<50>, boost::multiprecision::et_off>
|
|
cpp_dec_float_50_noet;
|
|
|
|
You can reduce typing with a `using` directive `using namespace boost::multiprecision;`
|
|
if desired, as shown below.
|
|
*/
|
|
|
|
using namespace boost::multiprecision;
|
|
|
|
|
|
/*`Now `cpp_dec_float_50_noet` or `cpp_dec_float_50_et`
|
|
can be used as a direct replacement for built-in types like `double` etc.
|
|
*/
|
|
|
|
BOOST_AUTO_TEST_CASE(cpp_float_test_check_close_noet)
|
|
{ // No expression templates/
|
|
typedef number<cpp_dec_float<50>, et_off> cpp_dec_float_50_noet;
|
|
|
|
std::cout.precision(std::numeric_limits<cpp_dec_float_50_noet>::digits10); // All significant digits.
|
|
std::cout << std::showpoint << std::endl; // Show trailing zeros.
|
|
|
|
cpp_dec_float_50_noet a ("1.0");
|
|
cpp_dec_float_50_noet b ("1.0");
|
|
b += std::numeric_limits<cpp_dec_float_50_noet>::epsilon(); // Increment least significant decimal digit.
|
|
|
|
cpp_dec_float_50_noet eps = std::numeric_limits<cpp_dec_float_50_noet>::epsilon();
|
|
|
|
std::cout <<"a = " << a << ",\nb = " << b << ",\neps = " << eps << std::endl;
|
|
|
|
BOOST_CHECK_CLOSE(a, b, eps * 100); // Expected to pass (because tolerance is as percent).
|
|
BOOST_CHECK_CLOSE_FRACTION(a, b, eps); // Expected to pass (because tolerance is as fraction).
|
|
|
|
|
|
|
|
} // BOOST_AUTO_TEST_CASE(cpp_float_test_check_close)
|
|
|
|
BOOST_AUTO_TEST_CASE(cpp_float_test_check_close_et)
|
|
{ // Using expression templates.
|
|
typedef number<cpp_dec_float<50>, et_on> cpp_dec_float_50_et;
|
|
|
|
std::cout.precision(std::numeric_limits<cpp_dec_float_50_et>::digits10); // All significant digits.
|
|
std::cout << std::showpoint << std::endl; // Show trailing zeros.
|
|
|
|
cpp_dec_float_50_et a("1.0");
|
|
cpp_dec_float_50_et b("1.0");
|
|
b += std::numeric_limits<cpp_dec_float_50_et>::epsilon(); // Increment least significant decimal digit.
|
|
|
|
cpp_dec_float_50_et eps = std::numeric_limits<cpp_dec_float_50_et>::epsilon();
|
|
|
|
std::cout << "a = " << a << ",\nb = " << b << ",\neps = " << eps << std::endl;
|
|
|
|
BOOST_CHECK_CLOSE(a, b, eps * 100); // Expected to pass (because tolerance is as percent).
|
|
BOOST_CHECK_CLOSE_FRACTION(a, b, eps); // Expected to pass (because tolerance is as fraction).
|
|
|
|
/*`Using `cpp_dec_float_50` with the default expression template use switched on,
|
|
the compiler error message for `BOOST_CHECK_CLOSE_FRACTION(a, b, eps); would be:
|
|
*/
|
|
// failure floating_point_comparison.hpp(59): error C2440: 'static_cast' :
|
|
// cannot convert from 'int' to 'boost::multiprecision::detail::expression<tag,Arg1,Arg2,Arg3,Arg4>'
|
|
//] [/expression_template_1]
|
|
|
|
} // BOOST_AUTO_TEST_CASE(cpp_float_test_check_close)
|
|
|
|
/*
|
|
|
|
Output:
|
|
|
|
Description: Autorun "J:\Cpp\big_number\Debug\test_cpp_float_close_fraction.exe"
|
|
Running 1 test case...
|
|
|
|
a = 1.0000000000000000000000000000000000000000000000000,
|
|
b = 1.0000000000000000000000000000000000000000000000001,
|
|
eps = 1.0000000000000000000000000000000000000000000000000e-49
|
|
|
|
*** No errors detected
|
|
|
|
|
|
*/
|
|
|