Merge pull request #950 from cppalliance/member_const

Improve `const` correctness, comments, and large parameter passing

Author: mborland

include/boost/decimal/decimal128.hpp

@@ -147,6 +147,7 @@ BOOST_DECIMAL_FORCE_INLINE constexpr auto d64_mul_impl(T lhs_sig, U lhs_exp, boo
 
 template <typename ReturnType, BOOST_DECIMAL_INTEGRAL T1, BOOST_DECIMAL_INTEGRAL U1,
                                BOOST_DECIMAL_INTEGRAL T2, BOOST_DECIMAL_INTEGRAL U2>
+BOOST_DECIMAL_FORCE_INLINE
 constexpr auto d128_mul_impl(const T1& lhs_sig, const U1 lhs_exp, const bool lhs_sign,
                              const T2& rhs_sig, const U2 rhs_exp, const bool rhs_sign) noexcept -> ReturnType
 {

include/boost/decimal/decimal128_fast.hpp

@@ -52,7 +52,7 @@ BOOST_DECIMAL_CXX20_CONSTEXPR auto to_float(Decimal val) noexcept
             static_cast<void>(success);
     }
 
-    // The casts to result are redundant but in pre C++17 modes MSVC warns about implicit conversions
+    // The casts to result are redundant, but in pre C++17 modes MSVC warns about implicit conversions
     TargetType result {};
 
     auto sig {val.full_significand()};