Merge pull request #141 from abique/master

Fix for gcc 9.2, the constructor being explicit, must be explicitely …

Author: p12tic

simdpp/types/empty_expr.h

@@ -217,7 +217,7 @@ class mask_int32<N, expr_empty> : public any_int32<N, mask_int32<N,expr_empty>>
     SIMDPP_INL mask_int32(const mask_int32<N>& a) : e(a) {}
 
     SIMDPP_INL operator mask_int32<N>() const { return e; }
-    SIMDPP_INL operator uint32<N>() const { return e; }
+    SIMDPP_INL operator uint32<N>() const { return uint32<N>(e); }
     SIMDPP_INL mask_int32<N> eval() const { return e; }
 };