Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/src/boost/libs/multiprecision/example/mpfr_snips.cpp b/src/boost/libs/multiprecision/example/mpfr_snips.cpp
new file mode 100644
index 00000000..e0ac6aeb
--- /dev/null
+++ b/src/boost/libs/multiprecision/example/mpfr_snips.cpp
@@ -0,0 +1,40 @@
+///////////////////////////////////////////////////////////////
+//  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
+
+//[mpfr_eg
+#include <boost/multiprecision/mpfr.hpp>
+#include <boost/math/special_functions/gamma.hpp>
+#include <iostream>
+
+int main()
+{
+   using namespace boost::multiprecision;
+
+   // Operations at variable precision and no numeric_limits support:
+   mpfr_float a = 2;
+   mpfr_float::default_precision(1000);
+   std::cout << mpfr_float::default_precision() << std::endl;
+   std::cout << sqrt(a) << std::endl; // print root-2
+
+   // Operations at fixed precision and full numeric_limits support:
+   mpfr_float_100 b = 2;
+   std::cout << std::numeric_limits<mpfr_float_100>::digits << std::endl;
+   // We can use any C++ std lib function:
+   std::cout << log(b) << std::endl; // print log(2)
+   // We can also use any function from Boost.Math:
+   std::cout << boost::math::tgamma(b) << std::endl;
+   // These even work when the argument is an expression template:
+   std::cout << boost::math::tgamma(b * b) << std::endl;
+
+   // Access the underlying data:
+   mpfr_t r;
+   mpfr_init(r);
+   mpfr_set(r, b.backend().data(), GMP_RNDN);
+   mpfr_clear(r);
+   return 0;
+}
+//]
+
+