Add casts for scalar types

Author: kalenedrael

include/xsimd/arch/xsimd_scalar.hpp

@@ -1198,6 +1198,19 @@ namespace xsimd
     {
         return cond ? true_br : false_br;
     }
+
+    template <class T>
+    XSIMD_INLINE constexpr bool batch_bool_cast(bool b) noexcept
+    {
+        return b;
+    }
+
+    template <class T_out, class T_in>
+    XSIMD_INLINE constexpr T_out batch_cast(T_in const& val) noexcept
+    {
+        static_assert(!std::is_same<T_out, bool>::value, "cannot convert to bool, use !x or x != 0");
+        return static_cast<T_out>(val);
+    }
 }
 
 #endif

test/test_batch_cast.cpp

@@ -341,6 +341,7 @@ struct batch_cast_test
             T_out scalar_ref = static_cast<T_out>(in_test_value);
             T_out scalar_res = res.get(0);
             CHECK_SCALAR_EQ(scalar_ref, scalar_res);
+            CHECK_SCALAR_EQ(scalar_ref, xsimd::batch_cast<T_out>(in_test_value));
         }
     }
 
@@ -356,11 +357,13 @@ struct batch_cast_test
         B_common_out all_true_res = xsimd::batch_bool_cast<T_out>(all_true_in);
         INFO(name);
         CHECK_SCALAR_EQ(all_true_res.get(0), true);
+        CHECK_SCALAR_EQ(xsimd::batch_bool_cast<B_out>(true), true);
 
         B_common_in all_false_in(false);
         B_common_out all_false_res = xsimd::batch_bool_cast<T_out>(all_false_in);
         INFO(name);
         CHECK_SCALAR_EQ(all_false_res.get(0), false);
+        CHECK_SCALAR_EQ(xsimd::batch_bool_cast<B_out>(false), false);
     }
 };