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- ///////////////////////////////////////////////////////////////
- // Copyright Christopher Kormanyos 2002 - 2011.
- // Copyright 2011 John Maddock. Distributed under the Boost
- // Software License, Version 1.0. (See accompanying file
- // LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
- //
- // This work is based on an earlier work:
- // "Algorithm 910: A Portable C++ Multiple-Precision System for Special-Function Calculations",
- // in ACM TOMS, {VOL 37, ISSUE 4, (February 2011)} (C) ACM, 2011. http://doi.acm.org/10.1145/1916461.1916469
- #ifdef _MSC_VER
- #define _SCL_SECURE_NO_WARNINGS
- #endif
- #include <boost/detail/lightweight_test.hpp>
- #include "test.hpp"
- #include <boost/multiprecision/gmp.hpp>
- template <class T>
- T make_rvalue_copy(const T a)
- {
- return a;
- }
- int main()
- {
- using namespace boost::multiprecision;
- //
- // Test change of default precision:
- //
- mpf_float::default_precision(100);
- mpf_float a("0.1");
- BOOST_CHECK_GE(a.precision(), 100);
- mpf_float::default_precision(20);
- {
- // test assignment from lvalue:
- mpf_float b(2);
- BOOST_CHECK_GE(b.precision(), 20);
- b = a;
- BOOST_CHECK_EQUAL(b.precision(), a.precision());
- }
- #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
- {
- // test assignment from rvalue:
- mpf_float b(2);
- BOOST_CHECK_GE(b.precision(), 20);
- b = make_rvalue_copy(a);
- BOOST_CHECK_EQUAL(b.precision(), a.precision());
- }
- #endif
- mpf_float::default_precision(20);
- {
- // test construct from lvalue:
- mpf_float b(a);
- BOOST_CHECK_EQUAL(b.precision(), a.precision());
- }
- #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
- {
- // test construct from rvalue:
- mpf_float b(make_rvalue_copy(a));
- BOOST_CHECK_EQUAL(b.precision(), a.precision());
- }
- #endif
- {
- mpf_float f150(2, 150);
- BOOST_CHECK_GE(f150.precision(), 150);
- }
- {
- mpf_float f150("1.2", 150);
- BOOST_CHECK_GE(f150.precision(), 150);
- }
- //
- // From https://github.com/boostorg/multiprecision/issues/65
- //
- {
- mpf_float a(2);
- a.precision(100);
- BOOST_CHECK_EQUAL(a, 2);
- BOOST_CHECK_GE(a.precision(), 100);
- }
- //
- // string_view with explicit precision:
- //
- #ifndef BOOST_NO_CXX17_HDR_STRING_VIEW
- {
- std::string s("222");
- std::string_view v(s.c_str(), 1);
- mpf_float f(v, 100);
- BOOST_CHECK_EQUAL(f, 2);
- BOOST_CHECK_GE(f.precision(), 100);
- }
- #endif
- // Swap:
- {
- mpf_float x(2, 100); // 100 digits precision.
- mpf_float y(3, 50); // 50 digits precision.
- swap(x, y);
- BOOST_CHECK_EQUAL(x, 3);
- BOOST_CHECK_EQUAL(y, 2);
- BOOST_CHECK_GE(x.precision(), 50);
- BOOST_CHECK_GE(y.precision(), 100);
- x.swap(y);
- BOOST_CHECK_EQUAL(x, 2);
- BOOST_CHECK_EQUAL(y, 3);
- BOOST_CHECK_GE(x.precision(), 100);
- BOOST_CHECK_GE(y.precision(), 50);
- #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
- x = std::move(mpf_float(y));
- BOOST_CHECK_EQUAL(x, y);
- BOOST_CHECK_EQUAL(x.precision(), y.precision());
- #endif
- }
- {
- mpf_float c(4), d(8), e(9), f;
- f = (c + d) * d / e;
- mpf_float g((c + d) * d / e);
- }
- {
- mpf_float::default_precision(100);
- mpf_float f1;
- f1 = 3;
- BOOST_CHECK_GE(f1.precision(), 100);
- f1 = 3.5;
- BOOST_CHECK_GE(f1.precision(), 100);
- mpf_float f2(3.5);
- BOOST_CHECK_GE(f2.precision(), 100);
- mpf_float f3("5.1");
- BOOST_CHECK_GE(f3.precision(), 100);
- mpf_float::default_precision(50);
- mpf_float f4(f3, 50);
- BOOST_CHECK_GE(f4.precision(), 50);
- f4.assign(f1, f4.precision());
- BOOST_CHECK_GE(f4.precision(), 50);
- }
- return boost::report_errors();
- }
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