diff --git a/octa/range.hh b/octa/range.hh
index a6874f4..fa8cbda 100644
--- a/octa/range.hh
+++ b/octa/range.hh
@@ -177,7 +177,8 @@ template<typename T, bool = (octa::IsConvertible<
     RangeCategory<T>, OutputRangeTag
 >::value || (IsInputRange<T>::value &&
     (octa::detail::OutputRangeTest<T, const RangeValue<T>  &>::value ||
-     octa::detail::OutputRangeTest<T,       RangeValue<T> &&>::value)
+     octa::detail::OutputRangeTest<T,       RangeValue<T> &&>::value ||
+     octa::detail::OutputRangeTest<T,       RangeValue<T>   >::value)
 ))> struct IsOutputRange: False {};
 
 template<typename T>
@@ -462,14 +463,14 @@ template<typename B, typename C, typename V, typename R = V &,
 
     template<typename OR,
         typename = octa::EnableIf<octa::IsOutputRange<OR>::value
-    >> Size get_n(OR orange, Size n) {
+    >> Size get_n(OR orange, Size n = -1) {
         B &r = *((B *)this);
         Size on = n;
         for (; n && !r.empty() && orange.put(r.front()); --n);
         return (on - n);
     }
 
-    Size get_n(octa::RemoveCv<Value> *p, Size n) {
+    Size get_n(octa::RemoveCv<Value> *p, Size n = -1) {
         B &r = *((B *)this);
         Size on = n;
         for (; n && !r.empty(); --n) *p++ = r.front();
@@ -903,14 +904,16 @@ struct PointerRange: InputRange<PointerRange<T>, FiniteRandomAccessRangeTag, T>
 
     template<typename R,
         typename = octa::EnableIf<octa::IsOutputRange<R>::value
-    >> octa::Size get_n(R orange, octa::Size n) {
+    >> octa::Size get_n(R orange, octa::Size n = -1) {
         octa::Size c = size();
         if (n < c) c = n;
         return orange.put_n(p_beg, c);
     }
 
-    octa::Size get_n(octa::RemoveCv<T> *p, octa::Size n) {
-        return get_n(PointerRange(p, n), n);
+    octa::Size get_n(octa::RemoveCv<T> *p, octa::Size n = -1) {
+        octa::Size c = size();
+        if (n < c) c = n;
+        return get_n(PointerRange(p, c), c);
     }
 
 private:
diff --git a/octa/stream.hh b/octa/stream.hh
index 6242e7a..945ed58 100644
--- a/octa/stream.hh
+++ b/octa/stream.hh
@@ -214,7 +214,10 @@ struct StreamRange<T, true>: InputRange<
         return p_stream->put(p, n);
     }
 
-    octa::Size get_n(octa::RemoveCv<T> *p, octa::Size n) {
+    octa::Size get_n(octa::RemoveCv<T> *p, octa::Size n = -1) {
+        if (n == octa::Size(-1)) {
+            n = p_stream->size() / sizeof(T);
+        }
         return p_stream->get(p, n);
     }