Add mixed compound operators

Author: mborland

include/boost/decimal/decimal32_fast.hpp

@@ -255,6 +255,23 @@ class decimal32_fast final
     constexpr auto operator/=(decimal32_fast rhs) noexcept -> decimal32_fast&;
     constexpr auto operator%=(decimal32_fast rhs) noexcept -> decimal32_fast&;
 
+    // Mixed type compound operators
+    template <typename Integer>
+    constexpr auto operator+=(Integer rhs) noexcept
+        BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&);
+
+    template <typename Integer>
+    constexpr auto operator-=(Integer rhs) noexcept
+        BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&);
+
+    template <typename Integer>
+    constexpr auto operator*=(Integer rhs) noexcept
+        BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&);
+
+    template <typename Integer>
+    constexpr auto operator/=(Integer rhs) noexcept
+        BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&);
+
     // Increment and decrement
     constexpr auto operator++() noexcept -> decimal32_fast&;
     constexpr auto operator++(int) noexcept -> decimal32_fast&;
@@ -1108,6 +1125,38 @@ constexpr auto decimal32_fast::operator/=(decimal32_fast rhs) noexcept -> decima
     return *this;
 }
 
+template <typename Integer>
+constexpr auto decimal32_fast::operator+=(Integer rhs) noexcept
+    BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&)
+{
+    *this = *this + rhs;
+    return *this;
+}
+
+template <typename Integer>
+constexpr auto decimal32_fast::operator-=(Integer rhs) noexcept
+    BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&)
+{
+    *this = *this - rhs;
+    return *this;
+}
+
+template <typename Integer>
+constexpr auto decimal32_fast::operator*=(Integer rhs) noexcept
+    BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&)
+{
+    *this = *this * rhs;
+    return *this;
+}
+
+template <typename Integer>
+constexpr auto decimal32_fast::operator/=(Integer rhs) noexcept
+    BOOST_DECIMAL_REQUIRES_RETURN(detail::is_integral_v, Integer, decimal32_fast&)
+{
+    *this = *this / rhs;
+    return *this;
+}
+
 constexpr auto decimal32_fast::operator++() noexcept -> decimal32_fast&
 {
     constexpr decimal32_fast one(1, 0);