add eoEvalCmd, an eval that call a system command

eo/test/CMakeLists.txt

@@ -70,6 +70,7 @@ set (TEST_LIST
   #t-eoDualFitness
   t-eoParser
   t-eoPartiallyMappedXover
+  t-eoEvalCmd
   )
 
 

eo/test/t-eoEvalCmd.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+
+#include <eo>
+#include <es.h>
+
+using namespace std;
+
+int main(int /*argc*/, char* /*argv[]*/)
+{
+    typedef eoReal<eoMinimizingFitness> EOT;
+
+    // Build something like: ">&1 echo 1.2; # INVALID 2 1 2"
+    eoEvalCmd<EOT> eval("echo 1.2", ">&1", "; #");
+
+    EOT sol = {1,2};
+    std::clog << sol << std::endl;
+
+    try {
+        eval(sol);
+    } catch(eoSystemError& e) {
+        std::cerr << e.what() << std::endl;
+        exit(1);
+    }
+
+    std::clog << eval.last_call() << std::endl;
+    EOT::Fitness f = sol.fitness();
+    std::clog << "fitness: " << f << std::endl;
+    assert(f = 1.2);
+}