import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / libs / math / example / cohen_acceleration.cpp

diff --git a/ceph/src/boost/libs/math/example/cohen_acceleration.cpp b/ceph/src/boost/libs/math/example/cohen_acceleration.cpp
new file mode 100644 (file)
index 0000000..e16357d
--- /dev/null
+++ b/ceph/src/boost/libs/math/example/cohen_acceleration.cpp
@@ -0,0 +1,46 @@
+//  (C) Copyright Nick Thompson 2020.
+//  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)
+#include <iostream>
+#include <iomanip>
+#include <boost/math/tools/cohen_acceleration.hpp>
+#include <boost/math/constants/constants.hpp>
+
+using boost::math::tools::cohen_acceleration;
+using boost::math::constants::pi;
+
+template<typename Real>
+class G {
+public:
+    G(){
+        k_ = 0;
+    }
+    
+    Real operator()() {
+        k_ += 1;
+        return 1/(k_*k_);
+    }
+
+private:
+    Real k_;
+};
+
+int main() {
+    using Real = float;
+    auto g = G<Real>();
+    Real computed = cohen_acceleration(g);
+    Real expected = pi<Real>()*pi<Real>()/12;
+    std::cout << std::setprecision(std::numeric_limits<Real>::max_digits10);
+
+    std::cout << "Computed = " << computed << " = " << std::hexfloat << computed <<  "\n";
+    std::cout << std::defaultfloat;
+    std::cout << "Expected = " << expected << " = " << std::hexfloat << expected << "\n";
+
+    // Compute with a specified number of terms:
+    // Make sure to reset g:
+    g = G<Real>();
+    computed = cohen_acceleration(g, 5);
+    std::cout << std::defaultfloat;
+    std::cout << "Computed = " << computed << " = " << std::hexfloat << computed << " using 5 terms.\n";
+}