From bd422328989aed45c7dc4d8397e036084c2575b5 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Tue, 22 Mar 2016 08:15:19 +0000
Subject: [PATCH] Add extra conversion function to mpfr_float_backend to
 prevent double-rounding in some corner cases.

---
 include/boost/multiprecision/mpfr.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/boost/multiprecision/mpfr.hpp b/include/boost/multiprecision/mpfr.hpp
index fde558be..299de4a5 100644
--- a/include/boost/multiprecision/mpfr.hpp
+++ b/include/boost/multiprecision/mpfr.hpp
@@ -1228,6 +1228,11 @@ inline void eval_convert_to(boost::long_long_type* result, const mpfr_float_back
 }
 #endif
 template <unsigned digits10, mpfr_allocation_type AllocationType>
+inline void eval_convert_to(float* result, const mpfr_float_backend<digits10, AllocationType>& val) BOOST_NOEXCEPT
+{
+   *result = mpfr_get_flt(val.data(), GMP_RNDN);
+}
+template <unsigned digits10, mpfr_allocation_type AllocationType>
 inline void eval_convert_to(double* result, const mpfr_float_backend<digits10, AllocationType>& val) BOOST_NOEXCEPT
 {
    *result = mpfr_get_d(val.data(), GMP_RNDN);