alloc/raw/linear: add constructor from range types

alloc/raw/linear.cpp

@@ -30,7 +30,6 @@ linear::linear (void *begin, void *end):
 {
     CHECK_NEZ (begin);
     CHECK_NEZ (end);
-
     CHECK_LE (begin, end);
 }
 

alloc/raw/linear.hpp

@@ -18,6 +18,7 @@
 #define CRUFT_UTIL_ALLOC_RAW_LINEAR_HPP
 
 #include <cstddef>
+#include <iterator>
 
 namespace util::alloc::raw {
     // allocate progressively across a buffer without concern for deallocation.
@@ -31,6 +32,11 @@ namespace util::alloc::raw {
 
         linear (void *begin, void *end);
 
+        template <typename T>
+        linear (T &&view):
+            linear (std::begin (view), std::end (view))
+        { ; }
+
         void* allocate (size_t bytes);
         void* allocate (size_t bytes, size_t alignment);