string: add stub 'contains' query

string.hpp

@@ -127,6 +127,11 @@ namespace cruft {
             ) + 1u;
         }
 
+        bool contains (std::string_view key) const noexcept
+        {
+            return std::find (begin (), end (), key) != end ();
+        }
+
     private:
         const range_type m_range;
         const value_type m_separator;

test/string.cpp

@@ -69,6 +69,20 @@ test_tokeniser (cruft::TAP::logger &tap)
 }
 
 
+///////////////////////////////////////////////////////////////////////////////
+void
+test_contains (cruft::TAP::logger &tap)
+{
+    struct {
+        char const *haystack;
+        char const *needle;
+        bool expected;
+        char const *message;
+    } const TESTS[] = {
+    };
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 int
 main (int, char**)
@@ -77,6 +91,7 @@ main (int, char**)
 
     test_tokeniser (tap);
     test_position (tap);
+    test_contains (tap);
 
     return tap.status ();
 }