diff options
Diffstat (limited to 'boost/math/special_functions/digamma.hpp')
-rw-r--r-- | boost/math/special_functions/digamma.hpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/boost/math/special_functions/digamma.hpp b/boost/math/special_functions/digamma.hpp index 0dbddc77e2..1268b64dc9 100644 --- a/boost/math/special_functions/digamma.hpp +++ b/boost/math/special_functions/digamma.hpp @@ -407,6 +407,31 @@ T digamma_imp(T x, const Tag* t, const Policy& pol) return result; } +// +// Initializer: ensure all our constants are initialized prior to the first call of main: +// +template <class T, class Policy> +struct digamma_initializer +{ + struct init + { + init() + { + boost::math::digamma(T(1.5), Policy()); + boost::math::digamma(T(500), Policy()); + } + void force_instantiate()const{} + }; + static const init initializer; + static void force_instantiate() + { + initializer.force_instantiate(); + } +}; + +template <class T, class Policy> +const typename digamma_initializer<T, Policy>::init digamma_initializer<T, Policy>::initializer; + } // namespace detail template <class T, class Policy> @@ -433,6 +458,9 @@ inline typename tools::promote_args<T>::type >::type >::type tag_type; + // Force initialization of constants: + detail::digamma_initializer<result_type, Policy>::force_instantiate(); + return policies::checked_narrowing_cast<result_type, Policy>(detail::digamma_imp( static_cast<value_type>(x), static_cast<const tag_type*>(0), pol), "boost::math::digamma<%1%>(%1%)"); |