Changeset 5abc7fd in mainline

Timestamp:

2018-07-05T21:41:17Z (6 years ago)

Author:

Dzejrou <dzejrou@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

6d4e0d9

Parents:

5fb070d

git-author:

Jaroslav Jindrak <dzejrou@…> (2017-10-13 18:37:15)

git-committer:

Dzejrou <dzejrou@…> (2018-07-05 21:41:17)

Message:

cpp: added exchange and partial swap definitions

File:

• uspace/lib/cpp/include/impl/utility.hpp (modified) (1 diff)

uspace/lib/cpp/include/impl/utility.hpp

@@ -61 +61 @@
     }
 
-    // TODO: swap
-    // TODO: exchange
+    /**
+     * 20.2.2, swap:
+     */
+
+    template<class T>
+    void swap(T& x, T& y)
+        noexcept(is_nothrow_move_constructible<T>::value &&
+                 is_nothrow_move_assignable<T>::value)
+    {
+        T tmp{std::move(x)};
+        x = std::move(y);
+        y = std::move(tmp);
+    }
+
+    template<class T, size_t N>
+    void swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)))
+    {
+        // TODO: Use swap_ranges(a, a + N, b); when implemented.
+    }
+
+    /**
+     * 20.2.3, exchange:
+     */
+
+    template<class T, class U = T>
+    T exchange(T& obj, U&& new_val)
+    {
+        T old_val = std::move(obj);
+        obj = std::forward<U>(new_val);
+
+        return old_val;
+    }
 
     /**