Revert "after testing"

This reverts commit a733f30a31.

example/env/custom_interpreter_env.cpp

@@ -0,0 +1,42 @@
+//  (C) Copyright Gennadiy Rozental 2001-2014.
+//  Distributed under the Boost Software License, Version 1.0.
+//  (See accompanying file LICENSE_1_0.txt or copy at 
+//  http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/test for the library home page.
+
+// Boost.Runtime.Param
+#include <boost/test/utils/runtime/env/variable.hpp>
+#include <boost/test/utils/basic_cstring/io.hpp>
+
+namespace rt  = boost::runtime;
+namespace env = boost::runtime::env;
+
+// STL
+#include <iostream>
+
+void
+named_integer( rt::cstring source, boost::optional<int>& value )
+{
+    if( source == "one" )
+        value = 1;
+    else if( source == "two" )
+        value = 2;
+    else
+        value = 0;
+}
+
+env::variable<int> NUMBER1( "NUMBER1", env::interpreter = &named_integer );
+
+int main() {
+
+    std::cout << NUMBER1 << std::endl;
+
+    std::cout << env::var<int>( "NUMBER2", ( env::interpreter = &named_integer, env::default_value = 10 ))
+              << std::endl;
+
+    return 0;
+}
+
+// EOF
+