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99 lines
3.9 KiB
C++
99 lines
3.9 KiB
C++
///////////////////////////////////////////////////////////////
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// Copyright 2013 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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// Demonstrations of using Boost.Multiprecision float128 quad type.
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// (Only available using GCC compiler).
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// Contains Quickbook markup in comments.
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//[float128_eg
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#include <boost/multiprecision/float128.hpp>
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#include <boost/math/special_functions/gamma.hpp>
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#include <iostream>
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int main()
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{
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using namespace boost::multiprecision; // Potential to cause name collisions?
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// using boost::multiprecision::float128; // is safer.
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/*`The type float128 provides operations at 128-bit precision with
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[@https://en.wikipedia.org/wiki/Quadruple-precision_floating-point_format#IEEE_754_quadruple-precision_binary_floating-point_format:_binary128 Quadruple-precision floating-point format]
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and have full `std::numeric_limits` support:
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*/
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float128 b = 2;
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//` There are 15 bits of (biased) binary exponent and 113-bits of significand precision
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std::cout << std::numeric_limits<float128>::digits << std::endl;
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//` or 33 decimal places:
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std::cout << std::numeric_limits<float128>::digits10 << std::endl;
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//` We can use any C++ std library function, so let's show all the at-most 36 potentially significant digits, and any trailing zeros, as well:
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std::cout.setf(std::ios_base::showpoint); // Include any trailing zeros.
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std::cout << std::setprecision(std::numeric_limits<float128>::max_digits10)
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<< log(b) << std::endl; // Shows log(2) = 0.693147180559945309417232121458176575
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//` We can also use any function from Boost.Math, for example, the 'true gamma' function `tgamma`:
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std::cout << boost::math::tgamma(b) << std::endl;
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/*` And since we have an extended exponent range, we can generate some really large
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numbers here (4.02387260077093773543702433923004111e+2564):
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*/
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std::cout << boost::math::tgamma(float128(1000)) << std::endl;
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/*` We can declare constants using GCC or Intel's native types, and literals with the Q suffix, and these can be declared `constexpr` if required:
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*/
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/*<-*/
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#ifndef BOOST_NO_CXX11_CONSTEXPR
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/*->*/
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// std::numeric_limits<float128>::max_digits10 = 36
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constexpr float128 pi = 3.14159265358979323846264338327950288Q;
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std::cout.precision(std::numeric_limits<float128>::max_digits10);
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std::cout << "pi = " << pi << std::endl; //pi = 3.14159265358979323846264338327950280
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/*<-*/
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#endif
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/*->*/
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//] [/float128_eg]
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return 0;
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}
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/*
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//[float128_numeric_limits
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GCC 8.1.0
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Type name is float128_t:
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Type is g
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std::is_fundamental<> = true
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std::is_signed<> = true
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std::is_unsigned<> = false
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std::is_integral<> = false
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std::is_arithmetic<> = true
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std::is_const<> = false
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std::is_trivial<> = true
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std::is_standard_layout<> = true
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std::is_pod<> = true
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std::numeric_limits::<>is_exact = false
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std::numeric_limits::<>is bounded = true
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std::numeric_limits::<>is_modulo = false
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std::numeric_limits::<>is_iec559 = true
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std::numeric_limits::<>traps = false
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std::numeric_limits::<>tinyness_before = false
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std::numeric_limits::<>max() = 1.18973149535723176508575932662800702e+4932
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std::numeric_limits::<>min() = 3.36210314311209350626267781732175260e-4932
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std::numeric_limits::<>lowest() = -1.18973149535723176508575932662800702e+4932
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std::numeric_limits::<>min_exponent = -16381
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std::numeric_limits::<>max_exponent = 16384
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std::numeric_limits::<>epsilon() = 1.92592994438723585305597794258492732e-34
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std::numeric_limits::<>radix = 2
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std::numeric_limits::<>digits = 113
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std::numeric_limits::<>digits10 = 33
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std::numeric_limits::<>max_digits10 = 36
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std::numeric_limits::<>has denorm = true
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std::numeric_limits::<>denorm min = 6.47517511943802511092443895822764655e-4966
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std::denorm_loss = false
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limits::has_signaling_NaN == false
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std::numeric_limits::<>quiet_NaN = nan
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std::numeric_limits::<>infinity = inf
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//] [/float128_numeric_limits]
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*/
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