From 7911df4b6e766ecdc57ccbc233e2b454288c5b51 Mon Sep 17 00:00:00 2001
From: Mark Borgerding <mark@borgerding.net>
Date: Wed, 28 Oct 2009 23:22:10 -0400
Subject: [PATCH] improved selftest for Eigen::Complex -- mainly a
 documentation of what does not work

---
 unsupported/Eigen/Complex    | 14 ++++++++++-
 unsupported/test/Complex.cpp | 49 ++++++++++++++++++++----------------
 2 files changed, 40 insertions(+), 23 deletions(-)

diff --git a/unsupported/Eigen/Complex b/unsupported/Eigen/Complex
index 065c0305d..04228c95a 100644
--- a/unsupported/Eigen/Complex
+++ b/unsupported/Eigen/Complex
@@ -210,8 +210,20 @@ operator<< (std::basic_ostream<charT,traits>& ostr, const Complex<T>& rhs)
  template<class T> Complex<T> sqrt (const  Complex<T>&x){return sqrt(ei_to_std(x));}
  template<class T> Complex<T> tan (const  Complex<T>&x){return tan(ei_to_std(x));}
  template<class T> Complex<T> tanh (const  Complex<T>&x){return tanh(ei_to_std(x));}
-}
 
+  template<typename _Real> struct NumTraits<Complex<_Real> >
+  {
+    typedef _Real Real;
+    typedef Complex<_Real> FloatingPoint;
+    enum {
+      IsComplex = 1,
+      HasFloatingPoint = NumTraits<Real>::HasFloatingPoint,
+      ReadCost = 2,
+      AddCost = 2 * NumTraits<Real>::AddCost,
+      MulCost = 4 * NumTraits<Real>::MulCost + 2 * NumTraits<Real>::AddCost
+    };
+  };
+}
 #endif
 /* vim: set filetype=cpp et sw=2 ts=2 ai: */
 
diff --git a/unsupported/test/Complex.cpp b/unsupported/test/Complex.cpp
index 6360b58e4..bedeb9f27 100644
--- a/unsupported/test/Complex.cpp
+++ b/unsupported/test/Complex.cpp
@@ -22,13 +22,12 @@
 // License and a copy of the GNU General Public License along with
 // Eigen. If not, see <http://www.gnu.org/licenses/>.
 #ifdef EIGEN_TEST_FUNC
-#include "main.h"
+#  include "main.h"
 #else 
-#include <iostream>
-
-#define CALL_SUBTEST(x) x
-#define VERIFY(x) x
-#define test_Complex main
+#  include <iostream>
+#  define CALL_SUBTEST(x) x
+#  define VERIFY(x) x
+#  define test_Complex main
 #endif
 
 #include <unsupported/Eigen/Complex>
@@ -47,26 +46,32 @@ void take_std( std::complex<T> * dst, int n )
 template <typename T>
 void syntax()
 {
-    vector< Complex<T> > a;
-    a.resize( 9 );
-    //Complex<T> a[9];
-    Complex<T> b[9];
-
-    std::complex<T> * pa = &a[0]; // this works fine
-    std::complex<T> * pb = &b[0]; // this works fine
-    //VERIFY()
-    // this does not compile: 
-    //  take_std( &a[0] , a.size() );
-
+    // this works fine
+    Matrix< Complex<T>, 9, 1>  a;
+    std::complex<T> * pa = &a[0];
+    Complex<T> * pa2 = &a[0];
     take_std( pa,9);
+
+    // this does not work, but I wish it would
+    // take_std(&a[0];)
+    // this does
+    take_std( (std::complex<T> *)&a[0],9);
+
+    // this does not work, but it would be really nice
+    //vector< Complex<T> > a; 
+    // (on my gcc 4.4.1 )
+    // std::vector assumes operator& returns a POD pointer
+
+    // this works fine
+    Complex<T> b[9];
+    std::complex<T> * pb = &b[0]; // this works fine
+
     take_std( pb,9);
-    //take_std( static_cast<std::complex<T> *>( &a[0] ) , a.size() );
-    //take_std( &b[0] , 9 );
 }
 
-int test_Complex()
+void test_Complex()
 {
   CALL_SUBTEST( syntax<float>() );
-  //CALL_SUBTEST( syntax<double>() );
-  //CALL_SUBTEST( syntax<long double>() );
+  CALL_SUBTEST( syntax<double>() );
+  CALL_SUBTEST( syntax<long double>() );
 }