Changeset 2285

Timestamp:

Jun 27, 2010, 2:24:42 AM (11 years ago)

Author:

Peter

Message:

adding a class Dereferencer, a functor that returns *argument. refs #632

Location:

trunk

Files:

• test/utility_test.cc (modified) (3 diffs)
• yat/utility/stl_utility.h (modified) (2 diffs)

trunk/test/utility_test.cc

@@ -64 +64 @@
 void test_ptr_compare(test::Suite& suite);
 void test_compose_functors(test::Suite& suite);
+void test_dereferencer(test::Suite& suite);
 
 int main(int argc, char* argv[])
@@ -225 +226 @@
 }
 
+
+void test_dereferencer(test::Suite& suite)
+{
+  using utility::Dereferencer;
+  Dereferencer<double*> deref;
+  double x = 0;
+  double* px = &x;
+  deref(px) = 1.662;
+  if (!suite.add(x==1.662)) {
+    suite.out() << "test_dereferencer failed: x: " << x << "\n";
+  }
+}
 
 
@@ -495 +508 @@
 
 }
+

trunk/yat/utility/stl_utility.h

@@ -49 +49 @@
 #include <exception>
 #include <functional>
+#include <iterator>
 #include <map>
 #include <ostream>
@@ -89 +90 @@
     inline T operator()(T x) const
     { return std::abs(x); }
+  };
+
+
+  /**
+     \brief Adaptor between pointer and pointee interface
+
+     Pointer must have an \c operator*, i.e., \c Pointer can be a
+     traditional pointer or an \input_iterator. Return type is decided
+     by <a href=http://www.sgi.com/tech/stl/iterator_traits.html>
+     std::iterator_traits </a>.
+   */
+  template<typename Pointer>
+  struct Dereferencer : 
+    public std::unary_function<Pointer, 
+                               typename std::iterator_traits<Pointer>::reference>
+  {
+    /**
+       \return * \a ti
+     */
+    typename std::iterator_traits<Pointer>::reference
+    operator()(Pointer ti) const { return *ti; }
   };