coord/ops: add `all' overload for scalar bool

coord/ops.hpp

@@ -1269,6 +1269,18 @@ namespace util {
     }
 
 
+    ///------------------------------------------------------------------------
+    /// returns true if the value is true.
+    ///
+    /// provided so that templates may operate with the same calls for vectors
+    /// and scalars. eg, all (t >= 0 && t <= 1) shold work for either type.
+    constexpr bool
+    all (bool val)
+    {
+        return val;
+    }
+
+
     ///------------------------------------------------------------------------
     /// returns an instance of K elementwise using a when s is true, and b
     /// otherwise. ie, k[i] = s[i] ? a[i] : b[i];