allow/raw/linear: add typed offset query

2018-05-18 16:51:42 +10:00 · 2018-05-18 16:51:42 +10:00 · 7d315c8095
commit 7d315c8095
parent b7a4b8d1c0
1 changed files with 10 additions and 0 deletions
--- a/alloc/raw/linear.hpp
+++ b/alloc/raw/linear.hpp
@ -82,6 +82,16 @@ namespace util::alloc::raw {

        size_t offset (const void*) const;

+        template <typename ValueT>
+        size_t
+        offset (ValueT const *ptr) const
+        {
+            CHECK_MOD (reinterpret_cast<uintptr_t> (ptr),     sizeof (ValueT));
+            CHECK_MOD (reinterpret_cast<uintptr_t> (data ()), sizeof (ValueT));
+
+            return ptr - util::cast::alignment<ValueT const*> (data ());
+        }
+
        template <typename T>
        size_t
        offset (util::view<T*> ptr) const