view: add a free contains convenience function

2022-02-17 17:01:22 +10:00 · 2022-02-17 17:01:22 +10:00 · dbf19c5a2b
commit dbf19c5a2b
parent 4af3f5df31
1 changed files with 22 additions and 0 deletions
--- a/view.hpp
+++ b/view.hpp
@ -1032,6 +1032,28 @@ namespace cruft {
    }


+    ///////////////////////////////////////////////////////////////////////////
+    template <
+        typename IteratorA,
+        typename IteratorB,
+        typename ValueT
+    >
+    requires (
+        std::equality_comparable_with<
+            typename std::iterator_traits<IteratorA>::value_type,
+            ValueT
+        >
+    )
+    bool
+    contains (view<IteratorA, IteratorB> container, ValueT &&value)
+    {
+        for (auto const &inner: container)
+            if (inner == value)
+                return true;
+        return false;
+    }
+
+
    ///////////////////////////////////////////////////////////////////////////
    template <
        typename BeginA, typename EndA,