Function area_of_a_circle

be/src/runtime/multi-precision-test.cc:106–109

// http://www.boost.org/doc/libs/1_55_0/libs/multiprecision/doc/html/boost_multiprecision/tut/floats/fp_eg/aos.html

template<typename T> inline T area_of_a_circle(T r) {
   using boost::math::constants::pi;
   return pi<T>() * r * r;
}

TEST(MultiPrecisionFloatTest, Example) {
  const float r_f(float(123) / 100);