Mercurial > ldforge2 / file diff

--- a/src/typeconversions.h	Wed Jun 22 16:13:15 2022 +0300
+++ b/src/typeconversions.h	Wed Jun 22 16:53:35 2022 +0300
@@ -85,4 +85,20 @@
 	return reinterpret_cast<reftype>(enu);
 }
 
+//! \brief A version of static_cast that only works if casting from a wider
+//! integer type to a narrower integer type.
+template<typename T, typename R>
+constexpr auto narrow(R x)
+-> std::enable_if_t<sizeof(T) <= sizeof(R) and std::is_signed_v<T> == std::is_signed_v<R>, T>
+{
+	return static_cast<T>(x);
+}
+
+template<typename T, typename R>
+constexpr auto widen(R x)
+-> std::enable_if_t<sizeof(T) >= sizeof(R) and std::is_signed_v<T> == std::is_signed_v<R>, T>
+{
+	return static_cast<T>(x);
+}
+
 #endif // TYPECONVERSIONS_H